CN119382285A - Battery power control method, device and storage medium based on energy storage converter - Google Patents

Battery power control method, device and storage medium based on energy storage converter Download PDF

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Publication number
CN119382285A
CN119382285A CN202411528530.3A CN202411528530A CN119382285A CN 119382285 A CN119382285 A CN 119382285A CN 202411528530 A CN202411528530 A CN 202411528530A CN 119382285 A CN119382285 A CN 119382285A
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CN
China
Prior art keywords
current
battery pack
state
charging
discharging
Prior art date
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Pending
Application number
CN202411528530.3A
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Chinese (zh)
Inventor
袁东旭
杨宗丰
李道波
张洪涛
齐乐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BEIJING IN-POWER ELECTRIC CO LTD
Langfang In Power Electric Co ltd
Original Assignee
BEIJING IN-POWER ELECTRIC CO LTD
Langfang In Power Electric Co ltd
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Application filed by BEIJING IN-POWER ELECTRIC CO LTD, Langfang In Power Electric Co ltd filed Critical BEIJING IN-POWER ELECTRIC CO LTD
Priority to CN202411528530.3A priority Critical patent/CN119382285A/en
Publication of CN119382285A publication Critical patent/CN119382285A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/90—Regulation of charging or discharging current or voltage
    • H02J7/94—Regulation of charging or discharging current or voltage in response to battery current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/28—Arrangements for balancing of the load in networks by storage of energy
    • H02J3/32—Arrangements for balancing of the load in networks by storage of energy using batteries or super capacitors with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for AC mains or AC distribution networks
    • H02J3/38—Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries for charging batteries from AC mains by converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H02J7/61—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements against overcharge
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H02J7/62—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements against overcurrent
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H02J7/63—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements against overdischarge
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H02J7/64—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements against overvoltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/60—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements
    • H02J7/663—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including safety or protection arrangements using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/80—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries including monitoring or indicating arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or discharging batteries or for supplying loads from batteries
    • H02J7/90—Regulation of charging or discharging current or voltage
    • H02J7/96—Regulation of charging or discharging current or voltage in response to battery voltage

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application provides a battery power control method and device based on an energy storage converter and a storage medium, and belongs to the technical field of converter control. The method comprises the steps of obtaining operation parameters of a battery pack collected by a battery management system BMS, wherein the operation parameters comprise an operation state, a current, a voltage, a charge-discharge limiting current and a charge-discharge limiting voltage, controlling a power given value to be zero and switching off a direct current side switch when the operation state of the battery pack is determined to be an inoperable state according to the operation parameters or the operation state of the battery pack is determined to be an operable state according to the operation parameters and the battery pack is overvoltage or undervoltage, and starting a PI controller to adjust the power given value when the charge current or the discharge current of the battery pack is determined to be greater than the corresponding limiting current according to the operation parameters, otherwise, maintaining the power given value unchanged. The application can improve the control efficiency of the battery energy storage system.

Description

Battery power control method and device based on energy storage converter and storage medium
Technical Field
The present application relates to the field of current transformer control technologies, and in particular, to a battery power control method and apparatus based on an energy storage current transformer, and a storage medium.
Background
The novel energy storage is an important equipment foundation and key supporting technology for building a novel power system and pushing energy sources to be green and low-carbon to transform, along with the access of new energy sources such as photovoltaics, wind power and the like, energy exchange is needed between a direct-current micro-grid and an alternating-current grid, and an energy storage converter (Power Conversion System and PCS) is mostly adopted to serve as an energy conversion device, so that direct-current and alternating-current bidirectional conversion is realized. At present, the direct current side of the energy storage power station is mainly provided with a battery, and the requirements on charging voltage and current at the charging and discharging terminal are strict due to the performance characteristics of energy storage of the battery. In the engineering implementation process, the inventor finds that in the research process, in the current energy storage system control power limiting process, the current and voltage data of the battery pack are respectively collected by an energy storage converter and a battery management system (ENERGY MANAGEMENT SYSTEM, EMS), and due to the difference of hardware consistency and the difference of sampling frequency, sampling deviation can be introduced to influence the control efficiency of the battery energy storage system.
Disclosure of Invention
The embodiment of the application provides a battery power control method, a device and a storage medium based on an energy storage converter, which are used for solving the problem of how to improve the control efficiency of a battery energy storage system.
In a first aspect, an embodiment of the present application provides a battery power control method based on an energy storage converter, including:
Acquiring operation parameters of a battery pack acquired by a BMS, wherein the operation parameters comprise an operation state, current, voltage, charge-discharge limiting current and charge-discharge limiting voltage;
When the running state of the battery pack is determined to be an inoperable state according to the running parameters, or the running state of the battery pack is determined to be an operable state according to the running parameters and the battery pack is in overvoltage or undervoltage, controlling a power given value to be zero and switching off a direct current side switch;
And when the charging current or the discharging current of the battery pack is determined to be larger than the corresponding limiting current according to the operation parameters, starting the PI controller to adjust the power set value, otherwise, maintaining the power set value unchanged.
In one possible implementation manner, the starting PI controller performs power set point adjustment, including:
Calculating the maximum operable power according to the charging current and the charging and discharging limiting current of the battery pack;
and adjusting the power set value according to the maximum operable power.
In one possible implementation, the operation parameters of the battery pack in a charged state collected by the BMS are updated according to a set period.
In one possible implementation, the set period is greater than 0.1S.
In one possible implementation, the determining that the operation state of the battery pack is an operable state according to the operation parameter and the battery pack is over-voltage or under-voltage includes:
determining that the operation state in the operation parameters is an operable state;
determining whether the battery pack is in a charging state or a discharging state according to the current direction of the current;
when the charging state is the charging state, judging that the charging voltage is larger than the charging limiting voltage according to the charging voltage and the charging and discharging limiting voltage, and determining the overvoltage of the battery pack;
and when the charging state is a discharging state, judging that the discharging voltage is smaller than the discharging limiting voltage according to the discharging voltage and the charging and discharging limiting voltage, and determining the undervoltage of the battery pack.
In one possible implementation manner, the determining that the charging current or the discharging current of the battery pack is greater than the corresponding limiting current according to the operation parameter includes:
determining whether the battery pack is in a charging state or a discharging state according to the current direction of the current;
when the charging state is the charging state, judging whether the charging current is larger than the charging limiting current according to the charging current and the charging and discharging limiting current;
and when the charging state is a discharging state, judging whether the discharging current is larger than the discharging limiting current according to the discharging current and the charging and discharging limiting current.
In a second aspect, an embodiment of the present application provides a battery power control device based on an energy storage converter, including:
The battery pack comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the operation parameters of the battery pack acquired by the BMS, wherein the operation parameters comprise an operation state, current, voltage, charge-discharge limiting current and charge-discharge limiting voltage;
The control module is used for controlling the power set value to be zero and switching off the direct-current side switch when the running state of the battery pack is determined to be an inoperable state according to the running parameters or the running state of the battery pack is determined to be an operable state according to the running parameters and the battery pack is overvoltage or undervoltage;
and the adjusting module is used for starting the PI controller to adjust the power set value when the charging current or the discharging current of the battery pack is determined to be larger than the corresponding limiting current according to the operation parameters, and otherwise, maintaining the power set value unchanged.
In a third aspect, an embodiment of the present application provides an energy storage converter comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method according to the first aspect or any one of the possible implementations of the first aspect when the computer program is executed.
In a fourth aspect, embodiments of the present application provide a computer readable storage medium storing a computer program which, when executed by a processor, implements the steps of the method as described above in the first aspect or any one of the possible implementations of the first aspect.
The embodiment of the application provides a battery power control method, a device and a storage medium based on an energy storage converter, which are used for realizing real-time monitoring of key parameters, avoiding sampling errors and accurately judging the running state of a battery pack by acquiring the running parameters of the battery pack, including running state, current, voltage, charge-discharge limiting current and charge-discharge limiting voltage, acquired by a BMS. When the battery pack is monitored to be in an inoperable state or in an overvoltage or undervoltage condition although the battery pack is operable, immediately taking control measures to control the power set value to be zero and opening the direct-current side switch so as to ensure the safety of the battery pack. And when the charging current or the discharging current is detected to exceed the set limiting current, starting the PI controller to adjust the power set value so as to optimize the power set value. In other cases, the power setpoint is maintained constant to maintain stable operation of the system. The application can ensure the consistency of the power of the energy storage converter and the power of the battery, ensure that the battery end operates within the safety range allowed by the BMS system, furthest exert the performance of the battery and optimize the whole charge-discharge period. By means of synchronous parameter monitoring, real-time data analysis and flexible power adjustment schemes, efficient management of the running state of the battery pack is achieved, overcharge or overdischarge of the battery is effectively prevented, and control efficiency and response speed are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of an implementation of a battery power control method based on an energy storage converter according to an embodiment of the present application;
fig. 2 is a flowchart of an implementation of a battery power control method based on an energy storage converter according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of a battery power control device based on an energy storage converter according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an energy storage converter according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
The terms first, second and the like in the description and in the claims of embodiments of the application and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe embodiments of the application herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The term "plurality" means two or more, unless otherwise indicated. The character "/" indicates that the front and rear objects are an "or" relationship. For example, A/B represents A or B. The term "and/or" is an associative relationship that describes an object, meaning that there may be three relationships. For example, A and/or B, represent A or B, or three relationships of A and B.
The terminology used in the present application is used for the purpose of describing embodiments only and is not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a," "an," and "the" (the) are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this disclosure is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, when used in the present disclosure, the terms "comprises," "comprising," and/or variations thereof, mean that the recited features, integers, steps, operations, elements, and/or components are present, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising one..+ -." does not exclude the presence of additional identical elements in a process, method or apparatus comprising said element.
In the present application, each embodiment is mainly described and may be different from other embodiments, and the same similar parts between the embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method sections disclosed in the embodiments, the description of the method sections may be referred to for relevance.
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the following description will be made by way of specific embodiments with reference to the accompanying drawings.
Fig. 1 is a flowchart of an implementation of a battery power control method based on an energy storage converter according to an embodiment of the present application, as shown in fig. 1, the method includes the following steps:
S101, acquiring operation parameters of the battery pack acquired by the BMS, wherein the operation parameters comprise an operation state, current, voltage, charge-discharge limiting current and charge-discharge limiting voltage.
The execution main body of each embodiment of the present application may be a device having a data processing function, such as an energy storage converter, a processor, a microprocessor, and a server, and in an actual implementation process, a specific implementation manner of the execution main body may be selected according to an actual requirement, which is not particularly limited in this embodiment, so long as the execution main body is a device having a data processing function. For the convenience of scheme understanding, the energy storage converter is taken as an execution main body for description.
Optionally, when acquiring the operation parameters of the battery pack collected by the BMS, the operation parameters of the battery pack collected by the BMS are acquired by means of wireless communication or wired communication.
In the process of the cooperative work of the BMS and the energy storage converter, the direct current sampling deviation and the filtering time difference between the BMS and the energy storage converter can possibly generate the condition of data redundancy or repeated calculation, thereby affecting the accurate judgment and effective control of the running state of the battery pack. In the step S101, the energy storage converter acquires the operation parameters of the battery pack acquired by the BMS, so that the situation that no direct current sampling deviation and no filtering time difference exist between the energy storage converter and the BMS is effectively avoided, and the safe and efficient operation of the whole energy storage system is ensured.
Among them, wireless communication and wired communication each have advantages and disadvantages. The wireless communication has the advantages of high flexibility and simple wiring, and can realize remote and contactless data exchange. The wired communication has the advantages of high transmission speed and stable signal. Therefore, in actual implementation, any one of the modes may be selected as a basis for acquiring the operation parameters of the battery pack collected by the BMS according to the system distribution characteristics.
In addition, the classification of the operation states in the operation parameters is subdivided into two kinds of operable states and non-operable states. According to the actual running state of the battery pack, when the BMS collects the running parameters of the battery pack, the running state reflects the current running state of the battery pack, namely, the running state of the battery pack collected by the BMS is clearly marked as a runnable state or a non-runnable state.
In other possible implementations, the operating states in the operating parameters further include a charge-discharge state, so that the energy storage converter can quickly determine whether the battery pack is in a charge process or a discharge process.
The charge-discharge limiting current in the operating parameter includes a charge limiting current and a discharge limiting current. The charge-discharge limiting voltage includes a charge limiting voltage and a discharge limiting voltage.
S102, when the running state of the battery pack is determined to be an inoperable state according to the running parameters, or the running state of the battery pack is determined to be an operable state according to the running parameters and the battery pack is in overvoltage or undervoltage, controlling the power set value to be zero and switching off the direct current side switch.
When the operating state of the battery pack is determined to be an inoperable state according to the operating parameters, it often means that there is a serious malfunction inside the battery pack or that the external environment has exceeded its safe operating range. In order to prevent the potential damage from expanding, the system should immediately take an on-demand measure, i.e. set the power setpoint to zero, and rapidly open the dc side switch to achieve complete isolation from the grid or load. The battery pack is protected, and meanwhile, the safety of the whole power system is guaranteed.
Optionally, the method further comprises sending a shutdown instruction to the BMS. Wherein, the sending of the shutdown command to the BMS is performed before the control power set point is zero and the direct current side switch is opened, or after the control power set point is zero and the direct current side switch is opened, or simultaneously with the control power set point is zero and the direct current side switch is opened.
And S103, when the charging current or the discharging current of the battery pack is determined to be larger than the corresponding limiting current according to the operation parameters, starting the PI controller to adjust the power set value, otherwise, maintaining the power set value unchanged.
When the system detects that the charging current or the discharging current of the battery pack exceeds a preset limit value, it often means that the battery pack may be at risk of overload, or that parameters such as internal resistance, temperature and the like of the battery pack have been changed disadvantageously. At this time, the PI controller is started to calculate a proper power adjustment amount according to the deviation between the current and the limiting current, and the power set value is dynamically adjusted. The battery pack is guided to gradually recover to a safe and efficient running state by adjusting the power set value, so that overload of the battery pack is effectively prevented.
In the embodiment, the operation parameters of the battery pack, including the operation state, the current, the voltage, the charge-discharge limiting current and the charge-discharge limiting voltage, are acquired by the BMS, so that the real-time monitoring of the key parameters is realized, sampling errors are avoided, and the operation state of the battery pack can be accurately judged. When the battery pack is monitored to be in an inoperable state or in an overvoltage or undervoltage condition although the battery pack is operable, immediately taking control measures to control the power set value to be zero and opening the direct-current side switch so as to ensure the safety of the battery pack. And when the charging current or the discharging current is detected to exceed the set limiting current, starting the PI controller to adjust the power set value so as to optimize the power set value. In other cases, the power setpoint is maintained constant to maintain stable operation of the system. The invention can ensure the consistency of the power of the energy storage converter and the power of the battery, ensure that the battery end operates within the safety range allowed by the BMS system, furthest exert the performance of the battery and optimize the whole charge-discharge period. By means of synchronous parameter monitoring, real-time data analysis and flexible power adjustment schemes, efficient management of the running state of the battery pack is achieved, overcharge or overdischarge of the battery is effectively prevented, and control efficiency and response speed are improved.
In one possible implementation, starting the PI controller to make a power setpoint adjustment includes:
Calculating the maximum operable power according to the charging current and the charging and discharging limiting current of the battery pack;
and adjusting the power set value according to the maximum operable power.
The charging current of the battery pack directly reflects the current charging state and capacity of the battery pack, and the charging and discharging limiting current is a safety threshold set for protecting the battery pack from damage caused by overcharge and discharging. By monitoring the two key parameters in real time, the maximum running power allowed by the battery pack in the current state can be accurately calculated, so that a basis is provided for subsequent power set value adjustment.
After the power set value is adjusted according to the maximum operable power, the power set value is provided for the EMS system to perform power scheduling, so that the battery end is ensured to operate within the allowable range of the BMS system, the battery performance can be exerted to the maximum extent, and the overall charge and discharge time is optimized.
In the embodiment, the PI controller is started and optimized, and the maximum operable power is accurately calculated and the PI controller is used for adjusting the power set value, so that the accurate adjustment of the power set value is realized, and the battery performance is optimized.
In one possible implementation, the operation parameters of the battery pack in a charged state collected by the BMS are updated according to a set period.
The charging and discharging process of the battery is a highly dynamic and complex physicochemical change process, and the process involves real-time changes of multiple parameters such as voltage, current, temperature, internal resistance and the like, so that the operation parameters of the battery pack in a charging state, collected by the BMS, are required to be periodically obtained to be dynamically adjusted, and the overall efficiency is improved.
In addition, in the process of charging and discharging the battery, according to the real-time change of multiple parameters such as temperature, internal resistance and the like, the corresponding charging and discharging limiting current and charging and discharging limiting voltage can relatively change, so that when the operation parameters of the battery pack of the BMS system are periodically acquired, the charging and discharging limiting current and the charging and discharging limiting voltage are required to be dynamically acquired.
In one possible implementation, the set period is greater than 0.1S.
The BMS system generally has high-speed data acquisition and processing capability and can complete one complete battery parameter scan in millisecond-level time. Too short an update period may place unnecessary computational burden on the system and even affect the proper operation of other critical functions. Therefore, the setting period is larger than 0.1S, so that the timeliness of data can be ensured, and the stability of the system can be considered.
In other possible implementations, the setting period is modified according to the ambient temperature, the charging strategy, the usage habit of the vehicle, and the like, so as to adapt to different requirements.
In one possible implementation, determining that the operating state of the battery pack is an operable state and the battery pack is over-or under-voltage according to the operating parameter includes:
determining the operation state in the operation parameters as an operable state;
Determining whether the battery pack is in a charging state or a discharging state according to the current direction of the current;
when the charging state is the charging state, judging that the charging voltage is larger than the charging limiting voltage according to the charging voltage and the charging and discharging limiting voltage, and determining the overvoltage of the battery pack;
When the charging state is the discharging state, the discharging voltage is judged to be smaller than the discharging limiting voltage according to the discharging voltage and the charging and discharging limiting voltage, and the undervoltage of the battery pack is determined.
In the practical implementation process, the operable state refers to a state that the battery pack is in a normal charge and discharge operation under the current environment, and is not in a fault state or a maintenance mode. In the embodiment of the present application, this determination is directly determined based on acquiring the operation parameters transmitted from the BMS.
In addition, the charge or discharge state of the battery pack is judged by the current direction of the current, which is the basis for the subsequent judgment of whether the battery pack is over-voltage or under-voltage. In the charged state, the system needs to further compare the charging voltage with a preset charging limit voltage. When the charging voltage monitored in real time exceeds the limit, the system immediately judges that the battery pack is in an overvoltage state and triggers corresponding protection measures. Similarly, in the discharge state, the system compares the discharge voltage with a preset discharge limit voltage. The discharge limit voltage is set to ensure that the battery pack can maintain a sufficient voltage level during discharge to meet the load requirements and to prevent problems such as equipment failure or data loss that may be caused by too low a voltage. Once the discharge voltage is found to be lower than the discharge limit voltage, the system determines that the battery pack is in an under-voltage state and triggers corresponding protection measures.
In this embodiment, the running state of the battery pack is determined according to the running parameters and whether the battery pack is over-voltage or under-voltage is determined, so that the quick response of the adjustment of the given power value is realized, and the performance and reliability of the battery management system are improved.
In one possible implementation, determining that the charge current or the discharge current of the battery pack is greater than the corresponding limit current according to the operating parameter includes:
Determining whether the battery pack is in a charging state or a discharging state according to the current direction of the current;
When the charging state is the charging state, judging whether the charging current is larger than the charging limiting current according to the charging current and the charging and discharging limiting current;
when the charging state is the discharging state, judging whether the discharging current is larger than the discharging limiting current according to the discharging current and the charging and discharging limiting current.
On the basis of the foregoing embodiment, in other possible implementation manners, when the operating state in the operating parameters includes the charge-discharge state after the energy storage ac acquires the operating parameters of the battery pack collected by the BMS, the operation of determining that the battery pack is in the charge state or the discharge state according to the current direction of the current is not needed, so that the judging and controlling efficiency is improved.
In a battery management system, a high-precision current sensor is usually installed to monitor the flow direction and magnitude of current in real time. When current flows from the external power source to the battery pack, it indicates that the battery pack is in a charged state, whereas when current flows from the battery pack to the external load, it indicates that the battery pack is discharging.
Fig. 2 is a flowchart of an implementation of a battery power control method based on an energy storage converter according to another embodiment of the present application, as shown in fig. 2, the method includes the following steps:
and adjusting the parameters of the PI controller to adapt to the control requirement of the battery pack.
And then, acquiring the operation parameters of the battery pack acquired by the BMS, judging whether the BMS battery pack has faults, and if the BMS battery pack has no faults, corresponding to an operable state, otherwise, corresponding to an inoperable state. In the non-operational state, protection measures are taken, namely sending a shutdown command to the BMS and dropping the PCS given power to zero.
In the state that the BMS battery pack has no fault, the PCS current execution power value P is maintained, and it is further determined whether the current battery pack is over-voltage or under-voltage. In the event of an overvoltage or undervoltage, the aforementioned protective measures are taken.
And when the battery pack is not over-voltage or under-voltage, continuously judging the charge and discharge state according to the current of the battery pack. And when the current is larger than zero, the battery pack is judged to be in a discharging state, and when the current is smaller than zero, the battery pack is judged to be in a charging state.
Correspondingly, according to the charge and discharge state, comparing the current with the charge limiting current or the discharge limiting current, and when the current is larger than the corresponding limiting current, starting the PI controller to adjust the power set value, otherwise, maintaining the power set value unchanged.
The PCS performs the power target value P, i.e., the power determined by the PI controller or the current power, according to the power set value determination result.
The above steps are repeatedly executed according to a set period Tick.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
The following are device embodiments of the application, for details not described in detail therein, reference may be made to the corresponding method embodiments described above.
Fig. 3 is a schematic structural diagram of a battery power control device based on an energy storage converter according to an embodiment of the present application, as shown in fig. 3, and for convenience of explanation, only a portion related to the embodiment of the present application is shown, as shown in fig. 3, the device includes:
The acquisition module 301 is configured to acquire an operation parameter of the battery pack acquired by the BMS, where the operation parameter includes an operation state, a current, a voltage, a charge-discharge limiting current, and a charge-discharge limiting voltage;
a control module 302, configured to control a power set point to be zero and turn off a dc side switch when the operating state of the battery pack is determined to be an inoperable state according to the operating parameter, or the operating state of the battery pack is determined to be an operable state according to the operating parameter and the battery pack is over-voltage or under-voltage;
And the adjusting module 303 is used for starting the PI controller to adjust the power set value when the charging current or the discharging current of the battery pack is determined to be larger than the corresponding limiting current according to the operation parameters, otherwise, maintaining the power set value unchanged.
In one possible implementation, the PI controller calculates the maximum operable power according to the charging current and the charging/discharging limiting current of the battery pack, and the adjustment module 303 is specifically configured to perform the power set point adjustment according to the maximum operable power.
In one possible implementation, the acquiring module 301 updates and acquires the operating parameters of the battery pack in the charged state acquired by the BMS according to the set period.
In one possible implementation, the set period is greater than 0.1S.
In one possible implementation, the control module 302 is specifically configured to:
determining the operation state in the operation parameters as an operable state;
Determining whether the battery pack is in a charging state or a discharging state according to the current direction of the current;
when the charging state is the charging state, judging that the charging voltage is larger than the charging limiting voltage according to the charging voltage and the charging and discharging limiting voltage, and determining the overvoltage of the battery pack;
When the charging state is the discharging state, the discharging voltage is judged to be smaller than the discharging limiting voltage according to the discharging voltage and the charging and discharging limiting voltage, and the undervoltage of the battery pack is determined.
In one possible implementation, the control module 302 is specifically configured to:
Determining whether the battery pack is in a charging state or a discharging state according to the current direction of the current;
When the charging state is the charging state, judging whether the charging current is larger than the charging limiting current according to the charging current and the charging and discharging limiting current;
when the charging state is the discharging state, judging whether the discharging current is larger than the discharging limiting current according to the discharging current and the charging and discharging limiting current.
In the embodiment, the operation parameters of the battery pack, including the operation state, the current, the voltage, the charge-discharge limiting current and the charge-discharge limiting voltage, are acquired by the BMS, so that the real-time monitoring of the key parameters is realized, sampling errors are avoided, and the operation state of the battery pack can be accurately judged. When the battery pack is monitored to be in an inoperable state or in an overvoltage or undervoltage condition although the battery pack is operable, immediately taking control measures to control the power set value to be zero and opening the direct-current side switch so as to ensure the safety of the battery pack. And when the charging current or the discharging current is detected to exceed the set limiting current, starting the PI controller to adjust the power set value so as to optimize the power set value. In other cases, the power setpoint is maintained constant to maintain stable operation of the system. The invention can ensure the consistency of the power of the energy storage converter and the power of the battery, ensure that the battery end operates within the safety range allowed by the BMS system, furthest exert the performance of the battery and optimize the whole charge-discharge period. By means of synchronous parameter monitoring, real-time data analysis and flexible power adjustment schemes, efficient management of the running state of the battery pack is achieved, overcharge or overdischarge of the battery is effectively prevented, and control efficiency and response speed are improved.
Fig. 4 is a schematic structural diagram of an energy storage converter according to an embodiment of the present application. As shown in fig. 4, the energy storage converter 4 of this embodiment comprises a processor 40, a memory 41 and a computer program 42 stored in said memory 41 and executable on said processor 40. The processor 40, when executing the computer program 42, implements the steps of the various embodiments of the energy storage converter based battery power control method described above, such as the steps shown in fig. 1. Or the processor 40, when executing the computer program 42, performs the functions of the modules/units of the apparatus embodiments described above, e.g., the functions of the modules shown in fig. 3.
Illustratively, the computer program 42 may be partitioned into one or more modules/units that are stored in the memory 41 and executed by the processor 40 to complete the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing a specific function describing the execution of the computer program 42 in the energy storage converter 4. For example, the computer program 42 may be partitioned into the modules shown in FIG. 3.
The energy storage converter 4 may include, but is not limited to, a processor 40, a memory 41. It will be appreciated by those skilled in the art that fig. 4 is merely an example of an energy storage converter 4 and is not meant to be limiting as the energy storage converter 4 may include more or fewer components than shown, or may combine certain components, or different components, e.g., the energy storage converter may further include input and output devices, network access devices, buses, etc.
The Processor 40 may be a central processing unit (Central Processing Unit, CPU), other general purpose Processor, digital signal Processor (DIGITAL SIGNAL Processor, DSP), application SPECIFIC INTEGRATED Circuit (ASIC), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA) or other Programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 41 may be an internal storage unit of the energy storage converter 4, for example a hard disk or a memory of the energy storage converter 4. The memory 41 may also be an external storage device of the energy storage converter 4, such as a plug-in hard disk, a smart memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, a flash memory card (FLASH CARD) or the like, which are provided on the energy storage converter 4. Further, the memory 41 may also comprise both an internal memory unit and an external memory device of the energy storage converter 4. The memory 41 is used for storing the computer program and other programs and data required by the energy storage converter. The memory 41 may also be used for temporarily storing data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/energy storage converter and method may be implemented in other manners. For example, the above-described apparatus/energy storage converter embodiments are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated modules/units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the present application may implement all or part of the above-described embodiment of the method, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and the computer program may implement the steps of each of the above-described embodiments of the energy storage converter-based battery power control method when executed by a processor. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
The foregoing embodiments are merely illustrative of the technical solutions of the present application, and not restrictive, and although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that modifications may still be made to the technical solutions described in the foregoing embodiments or equivalent substitutions of some technical features thereof, and that such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. The battery power control method based on the energy storage converter is characterized by comprising the following steps of:
acquiring operation parameters of a battery pack acquired by a battery management system BMS, wherein the operation parameters comprise an operation state, current, voltage, charge-discharge limiting current and charge-discharge limiting voltage;
When the running state of the battery pack is determined to be an inoperable state according to the running parameters, or the running state of the battery pack is determined to be an operable state according to the running parameters and the battery pack is in overvoltage or undervoltage, controlling a power given value to be zero and switching off a direct current side switch;
And when the charging current or the discharging current of the battery pack is determined to be larger than the corresponding limiting current according to the operation parameters, starting the PI controller to adjust the power set value, otherwise, maintaining the power set value unchanged.
2. The energy storage converter-based battery power control method of claim 1, wherein the enabling the PI controller to make a power setpoint adjustment comprises:
Calculating the maximum operable power according to the charging current and the charging and discharging limiting current of the battery pack;
and adjusting the power set value according to the maximum operable power.
3. The battery power control method based on the energy storage converter according to claim 1 or 2, wherein the operation parameters of the battery pack in a charged state collected by the BMS are updated and acquired according to a set period.
4. The energy storage converter based battery power control method of claim 3, wherein the set period is greater than 0.1S.
5. The energy storage converter-based battery power control method of claim 1, wherein the determining that the operating state of the battery pack is an operable state and the battery pack is over-or under-voltage according to the operating parameter comprises:
determining that the operation state in the operation parameters is an operable state;
determining whether the battery pack is in a charging state or a discharging state according to the current direction of the current;
when the charging state is the charging state, judging that the charging voltage is larger than the charging limiting voltage according to the charging voltage and the charging and discharging limiting voltage, and determining the overvoltage of the battery pack;
and when the charging state is a discharging state, judging that the discharging voltage is smaller than the discharging limiting voltage according to the discharging voltage and the charging and discharging limiting voltage, and determining the undervoltage of the battery pack.
6. The energy storage converter-based battery power control method of claim 1, wherein said determining that the charge current or the discharge current of the battery pack is greater than a corresponding limit current according to the operating parameter comprises:
determining whether the battery pack is in a charging state or a discharging state according to the current direction of the current;
when the charging state is the charging state, judging whether the charging current is larger than the charging limiting current according to the charging current and the charging and discharging limiting current;
and when the charging state is a discharging state, judging whether the discharging current is larger than the discharging limiting current according to the discharging current and the charging and discharging limiting current.
7. A battery power control device based on an energy storage converter, comprising:
The battery pack comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the operation parameters of the battery pack acquired by the BMS, wherein the operation parameters comprise an operation state, current, voltage, charge-discharge limiting current and charge-discharge limiting voltage;
The control module is used for controlling the power set value to be zero and switching off the direct-current side switch when the running state of the battery pack is determined to be an inoperable state according to the running parameters or the running state of the battery pack is determined to be an operable state according to the running parameters and the battery pack is overvoltage or undervoltage;
and the adjusting module is used for starting the PI controller to adjust the power set value when the charging current or the discharging current of the battery pack is determined to be larger than the corresponding limiting current according to the operation parameters, and otherwise, maintaining the power set value unchanged.
8. The battery power control device based on the energy storage converter of claim 7, wherein the acquisition module updates and acquires the operation parameters of the battery pack in a charged state acquired by the BMS according to a set period.
9. An energy storage converter comprising a memory, a processor and a computer program stored in the memory and capable of running on the processor, characterized in that the processor implements the steps of the method according to any of the preceding claims 1 to 6 when the computer program is executed by the processor.
10. A computer readable storage medium storing a computer program, characterized in that the computer program when executed by a processor implements the steps of the method according to any of the preceding claims 1 to 6.
CN202411528530.3A 2024-10-30 2024-10-30 Battery power control method, device and storage medium based on energy storage converter Pending CN119382285A (en)

Priority Applications (1)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202411528530.3A CN119382285A (en) 2024-10-30 2024-10-30 Battery power control method, device and storage medium based on energy storage converter

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CN119382285A true CN119382285A (en) 2025-01-28

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