CN102882237A - Intelligent energy storage machine and operating method thereof - Google Patents

Abstract

The invention provides an intelligent energy storage machine and its working method. The large-scale use of the intelligent energy storage machine can make the electricity load of the power grid relatively stable, balance the electricity load day and night, and realize the function of "shaving peaks and filling valleys"; The input interface of small wind power and photovoltaic power generation can easily realize the connection of new energy into the power system. Intelligent energy storage machine, including cabinet shell, control system, energy device and energy storage device: the energy device is used to provide energy for the load; the energy device includes solar energy device, wind energy device and mains power; The electric energy generated by the wind energy device is stored in the energy storage device; the energy storage device is an energy storage battery pack, and the energy storage battery pack is used to store the energy generated by the light energy device and the wind energy device and the energy charged by the mains; The control system includes: a wind-solar hybrid controller, a grid-connected inverter, an off-grid inverter, a PLC controller, a battery management system, and a two-way smart watt-hour meter.

Description

Intelligent energy storage machine and its working method

technical field

The invention belongs to the technical field of household appliances, and relates to an intelligent energy storage machine and a working method thereof, especially to an intelligent energy storage machine and a working method thereof used in homes and public places. the

Background technique

With the development of economy and modern industry, society's requirements for electric energy are increasing day by day, and power users have higher and higher requirements for power supply quality and power supply stability. The major power grids are delivering power to various industrial and commercial households with high loads, but the peak power consumption is more during the day, and the power consumption at night is basically reduced, which makes the peak-valley difference of the major power grids increasing day by day, but the power stations cannot stop working . Therefore, it is easy to cause waste of power resources at night. However, wind power and photovoltaic power generation are easily affected by natural factors such as weather, resulting in extremely unstable voltage and power. In addition, with the construction of large-scale supercritical power generation units and nuclear power generation units in recent years (which cannot be started and stopped frequently) and the country’s macroeconomic regulation and control and restrictions on high-energy-consuming enterprises, there is a problem of lack of peak-shaving means in low valleys will be more prominent. the

In the past 20 to 30 years, energy storage technology has developed rapidly, usually in the form of pumped water storage, ice storage, battery storage, flywheel energy storage, etc. Among them, pumped storage power plants have a certain scale of use , Japan, the United States, Italy, Germany, France and other countries have a large installed capacity of pumped storage, but their development is limited due to large investment scale, geographical constraints, and pollution of water resources. Battery energy storage technology is a new type of energy storage technology developed in recent years. MW-level industrial energy storage power stations are used both at home and abroad. Small-scale power storage needs based on households, and large-scale industrial energy storage power stations are difficult to solve household power consumption problems. Intelligent energy storage equipment solves the problems of grid waste at night, helps grid peak regulation, solves problems such as wind energy and photovoltaic power generation cannot be connected to the grid, and is suitable for small and medium-capacity electric energy storage occasions, such as homes, villas, hospitals, farms, islands, outdoors Temporary power supply and other occasions. At the same time, the intelligent energy storage device can be used as a backup power supply. When the mains power fails, the intelligent energy storage device provides power output; and realizes peak shifting power consumption, saving electricity expenses. In the prior art, there is no disclosed technical solution of an intelligent energy storage device with ideal effects. the

In the prior art, most of them only involve backup power supply equipment, or a single wind-solar energy storage, for example, only lead-acid batteries are used as uninterruptible power supplies, without wind-solar energy storage, and two-way power transmission functions. There are still the following problems that need to be solved: 1. The cycle life of energy storage batteries for household secondary energy generation is short; 2. The problem that household power generation cannot be connected to the grid to sell electricity when there is surplus; 3. Household electricity metering is useless and smart home appliances Control the problem of docking; 4. Solve the problem of not being able to enjoy low electricity prices. the

Contents of the invention

The purpose of the present invention is to provide an intelligent energy storage machine and its working method. The large-scale use of household energy storage equipment can make the power load of the power grid relatively stable, balance the power load day and night, and realize the function of "shaving peaks and filling valleys"; And there are small wind power and photovoltaic power generation input interfaces, which can easily realize the integration of new energy into the power system. the

The present invention is achieved through the following technical solutions:

An intelligent energy storage machine, including a cabinet, a control system, an energy device and an energy storage device: the energy device is used to provide energy for the load; where:

The energy device includes light energy device, wind energy device and mains power;

The light energy device is used to collect solar light energy, and convert the energy contained in the sunlight into electric energy through photoelectric conversion; the wind energy device is used to convert the mechanical energy contained in the wind into electric energy; the light energy device and the wind energy device generate The electrical energy is stored in the energy storage device;

The energy storage device is an energy storage battery pack, and the energy storage battery pack is used to store the energy generated by the light energy device and the wind energy device and the energy charged by the mains;

The control system includes: wind and solar hybrid controller, grid-connected inverter, off-grid inverter, PLC controller, battery management system and two-way smart watt-hour meter;

The wind-solar hybrid controller is an energy conversion device. The solar energy device and the wind energy device are controlled and adjusted by the wind-solar hybrid controller and output a DC power supply with stable voltage to charge the energy storage battery pack, and store the electric energy in the storage battery. in the battery pack;

The grid-connected inverter is used to detect the parameters of the mains in real time, so as to feed back the energy inverter output of the energy storage battery pack to the mains;

The off-grid inverter (with UPS inverter function) is used to realize the conversion control from direct current to alternating current. When the utility power stops supplying power, the off-grid inverter quickly switches to the energy storage battery pack as the power supply for the load, ensuring Uninterrupted load power consumption;

The PLC controller is the core control part of the coordinated control of each component module of the intelligent energy storage machine. It connects each module in a communication manner, and formulates and outputs to each component module according to the monitored battery parameters, setting parameters, and output requirements. internal control directives;

The battery management system is used to protect and control the energy storage battery pack; the battery management system monitors and monitors the parameters and characteristic point temperature of the single battery in real time, and at the same time, the battery management system calculates the remaining power of the battery according to the monitoring data. The results output the corresponding control management mode;

The two-way smart watt-hour meter is used for two-way metering of electric energy, and at the same time can be used for time-of-use electricity price billing;

The energy storage battery pack, wind-solar hybrid controller, grid-connected inverter, off-grid inverter, PLC controller, battery management system and bidirectional smart watt-hour meter are all arranged on the cabinet shell or in the inner cavity. the

The working method of the intelligent energy storage machine, which includes the following steps:

① When the mains power is in normal state, the capacity of the energy storage battery pack is less than the lower limit of discharge, and the current low electricity price period, the control system instructs the mains power to charge the energy storage battery pack. When the mains power is charged, the capacity of the energy storage battery pack reaches the set value Set the upper limit, stop the mains charging;

②When the mains power is in normal state, the capacity of the energy storage battery pack is greater than the lower limit of discharge and not greater than the upper limit of wind and solar charging, and at the same time it is currently in the peak electricity price period, the solar energy device and the wind energy device charge the energy storage battery pack and disconnect the grid at the same time. Electric power supply, intelligent energy storage machine inverter output, providing power for loads, reducing electricity expenses;

③When the mains power is in a normal state, the capacity of the energy storage battery pack is greater than the set inverter upper limit, and it is currently in the peak electricity price period, the control system instructs the grid-connected inverter to output and "sell electricity" to the grid. the

The beneficial effects of the present invention are as follows:

The intelligent energy storage machine of the present invention is first used as a household energy storage device. Since the energy device includes a solar energy device, a wind energy device, and a mains power supply, the control system includes: a wind and solar hybrid controller, a grid-connected inverter, an off-grid Inverter, PLC controller, battery management system and two-way smart watt-hour meter; the large-scale use of this smart energy storage machine can make the power load of the grid relatively stable, balance the power load day and night, and realize the goal of "shaving peaks and filling valleys". effect. For key places such as base stations, data centers, hospital emergency rooms, power station control rooms, etc., it can meet the function of backup power supply, ensure the stability of system power supply, and provide power supply security for the normal operation of equipment. When the mains power fails, the home energy storage device provides power output, which can meet the temporary power supply for 1-2 days. The intelligent energy storage machine of the present invention adds a grid-connected power feeding function to realize a small-scale distributed energy generation system; it has the function of bidirectional metering of electric energy, and also has functions such as time-of-use electricity price billing. At the same time, it also has the following expansion functions: small-scale wind power, photovoltaic power generation input interface, easy to realize new energy access to the power system; the equipment has a communication interface, which can realize the control function of smart home appliances; modular design, system expansion is simple and convenient. The specific advantages are described as follows:

(1) Back-up power supply function: When the mains power is abnormal or blackout, the household energy storage will switch to the battery power supply output instantly to provide reliable power supply for the load. the

(2) Realize staggered peak electricity consumption and save electricity expenses: In areas where "peak and valley electricity prices" are implemented, household energy storage devices can realize "power storage during valley hours and output during peak hours", achieving the effect of always consuming low-priced electricity. At the same time, it can reduce the burden of power consumption during peak hours of the grid. the

(3) Reserve small-scale wind power and photovoltaic power generation input interfaces, easily realize new energy access to the power system, and reduce electricity expenses for households. the

(4) In areas where households are allowed to feed power to the grid, grid-connected accessories are optional. When the secondary energy supply of wind and solar power exceeds demand, the household energy storage can be used to feed power to the grid to realize electricity sales. income. the

(5) The home energy storage device has functions such as two-way metering of electricity bills and smart home appliance control. the

(6) Modular design, system expansion is simple and convenient, after expansion, it can be used in large-capacity output occasions. the

The economic benefits of intelligent energy storage machines in household use are mainly manifested in the following aspects:

1. Realize staggered peak power consumption and save electricity expenses. If the peak-valley electricity price is realized, calculated according to the current industrial peak-valley electricity price, the monthly electricity cost savings by using household energy storage equipment is calculated as follows: (taking Zhuhai as an example)

At present, the low electricity price is 0.34 yuan/kWh, the peak electricity price is 1.08 yuan/kWh, and the monthly electricity consumption of small and medium-sized households is considered as 150 kWh, which can save electricity costs = (peak electricity price and low valley electricity price) * monthly electricity consumption = (1.080. 34) *150 = 111 yuan, saving electricity bills for one year: 111*12 = 1332 yuan. the

2. The output of the equipment is based on the inverter output of the battery power to supply the power load, avoiding the damage to the home appliances caused by the fluctuation of the mains supply voltage, ensuring the high stability of the power supply voltage of the home appliances, and prolonging the life of the home appliances. the

3. The function of backup power supply. When the mains power fails, the intelligent energy storage machine can realize the uninterruptible power supply function to ensure normal power consumption and meet the high-quality demand for household power supply. the

4. It can be customized to increase the storage function of wind and solar power generation to realize the access of secondary energy, which can make the household electricity use zero cost (if there is excess electricity, it can be fed back to the grid to achieve negative cost). the

5. The control function of smart home appliances can be customized to realize smart control of home appliances. the

Description of drawings

Fig. 1 is the schematic diagram of the front view structure of the intelligent energy storage machine of the present invention;

Fig. 2 is the side view structural representation of intelligent energy storage machine of the present invention;

Fig. 3 is a schematic diagram of the control principle of the intelligent energy storage machine of the present invention;

Fig. 4 is a schematic diagram of the wiring principle of the intelligent energy storage machine of the present invention;

Fig. 5 is the working method flowchart of intelligent energy storage machine of the present invention;

Fig. 6 is a schematic diagram of the remote monitoring principle of the intelligent energy storage machine of the present invention;

Fig. 7 is a schematic diagram of the structure of a single energy storage battery of the intelligent energy storage machine of the present invention;

Fig. 8 is the detection curve diagram of the energy storage battery pack charging and discharging battery capacity/cycle life of the intelligent energy storage machine of the present invention;

Fig. 9 is a schematic diagram of the power supply of the intelligent energy storage machine of the present invention;

Fig. 10 is a schematic diagram of the wiring principle of the battery management system of the intelligent energy storage machine of the present invention. the

Explanation of reference signs:

1. Energy storage battery pack, 2. Touch screen, 3. On-grid inverter, 4. Off-grid inverter, 5. PLC controller, 6. Battery management system, 7. Two-way smart watt-hour meter, 8. Scenery Complementary controller, 9. Low voltage distributor, 10. Cabinet shell, 11. Charger, 12. Remote monitoring computer, 13. Switch, 14. Shunt, 15. Diode. the

Detailed ways

Please refer to Fig. 1, Fig. 2 and Fig. 3, the present invention discloses an intelligent energy storage machine, including a cabinet shell 10, a control system, an energy device and an energy storage device: the energy device is used to provide loads energy; of which:

The energy device includes light energy device, wind energy device and mains power;

The light energy device is used to collect solar light energy, and convert the energy contained in the sunlight into electric energy through photoelectric conversion; the wind energy device is used to convert the mechanical energy contained in the wind into electric energy; the light energy device and the wind energy device generate The electrical energy is stored in the energy storage device;

The energy storage device is an energy storage battery pack 1, and the energy storage battery pack 1 is used to store the energy generated by the light energy device and the wind energy device and the energy charged by the mains;

The control system includes: a wind-solar hybrid controller 8, a grid-connected inverter 3, an off-grid inverter 4, a PLC controller 5, a battery management system 6, and a two-way smart meter 7;

The wind-solar hybrid controller 8 is an energy conversion device. The solar energy device and the wind energy device are controlled and adjusted through the wind-solar hybrid controller and output a DC power supply with stable voltage to charge the energy storage battery pack and store the electric energy in the In the energy storage battery pack;

The grid-connected inverter 3 is used to detect the parameters of the mains in real time, so as to feed back the energy inverter output of the energy storage battery pack to the mains;

The off-grid inverter 4 is used to realize the conversion control from direct current to alternating current. When the mains power supply stops, the off-grid inverter quickly switches to the energy storage battery pack as the power supply for the load, ensuring uninterrupted power consumption of the load;

The PLC controller 5 is the core control part of the coordinated control of each component module of the intelligent energy storage machine. Output internal control instructions;

The battery management system 6 is used to protect and control the energy storage battery pack; the battery management system monitors and monitors the parameters and characteristic point temperature of the single battery in real time, and at the same time, the battery management system calculates the remaining power of the battery according to the monitoring data, for The monitoring results output the corresponding control management mode;

The two-way smart watt-hour meter 7 is used for two-way metering of electric energy, and can simultaneously charge for time-of-use electricity prices;

The energy storage battery pack 1, the wind-solar hybrid controller 8, the grid-connected inverter 3, the off-grid inverter 4, the PLC controller 5, the battery management system 6, and the bidirectional smart meter 7 are all arranged in the cabinet shell 10 on or in the cavity. the

The front of the cabinet 10 is provided with a touch screen 2 for displaying the parameters of the intelligent energy storage machine and as an input port for human-computer interaction. the

The control system includes: a low voltage distributor 9 and a charger 11 . the

As shown in Figure 4, the two-way smart watt-hour meter 7 is connected to the mains through the switch QF0, and the intermediate relay KA20 is connected to the mains to detect whether the mains is normal and send the information to the PLC controller; one end of the charger 11 is connected to the mains The other end is connected to the DC bus, and the connection between the charger 11 and the L1 line of the mains is provided with a protective switch QF1 and a controllable switch KA1; one end of the grid-connected inverter 3 is connected to the mains N line and L1 line, the other end is connected to the DC bus, and the connection between the grid-connected inverter 3 and the L1 line of the mains is provided with a protective switch QF2 and a controllable switch KA2; one end of the off-grid inverter 4 is connected to the mains The N line and L1 line of the electricity, the other end is connected to the DC bus, and the connection between the off-grid inverter 4 and the L1 line of the mains is provided with a protective switch QF3, and the off-grid inverter 4 has output lines N10 and L10 The two ends of the energy storage battery pack 1 are respectively connected to the positive and negative lines of the DC bus, and a shunt 14 capable of detecting DC current is arranged in the middle; the two ends of the wind-solar hybrid controller 8 are respectively connected to the positive and negative lines of the DC bus , a diode 15 is provided in the middle to ensure the unidirectional flow of current; the wind-solar hybrid controller 8 has a DC input interface for a solar energy device and a three-phase AC input interface for a wind energy device; the mains output power to the load through the N2 line and the L2 line. the

As shown in Figure 6, the remote monitoring computer 12 is an optional component, and the intelligent energy storage machine reserves an Ethernet communication interface, which can be connected to a home network or connected to the Internet to realize remote monitoring and energy consumption statistics, wherein the PLC controller 5 includes Two CPU hosts and multiple expansion modules are connected to each other by Ethernet TCP/IP and data exchange is realized through the switch 13, the remote monitoring computer 12 communicates with PLC by TCP/IP, the PLC controller 5 and the battery management system 6 , the grid-connected inverter 3, the touch screen 2 and the two-way smart watt-hour meter 7 realize data exchange through free port communication, and the communication interface is RS485. the

The energy storage battery pack 1 includes more than one set of lithium iron phosphate batteries or lithium titanate batteries. Figure 7 is a schematic diagram of the appearance and structure of a lithium iron phosphate battery cell. Energy storage battery pack 1 uses a secondary battery---lithium iron phosphate battery (lithium titanate battery may be selected when the technology of lithium titanate battery is mature), as the energy storage medium of the whole system. Compared with lead-acid battery, lithium iron phosphate battery, Secondary batteries such as nickel metal hydride batteries and lithium manganate batteries have indisputable advantages in terms of safety performance, cycle life, and energy density. In existing wind and photovoltaic power generation systems, backup DC power supplies, etc., lithium iron phosphate Batteries have a tendency to replace other batteries. At the same time, the battery can be charged and discharged at a high rate to meet the characteristics of load jumps during household use. The disadvantage is that the price is relatively high. In the long run, it is more cost-effective to use lithium iron phosphate batteries. The lithium iron phosphate battery adopts a modular design. The voltage of a single module is 3.2V, and the capacity is adjustable from 100AH to 460AH. During use, multiple modules need to be connected in series and parallel to form a battery pack. the

Figure 8 is a 3.2V, 460AH lithium iron phosphate module battery and its cycle characteristic diagram. It can be seen that the curve relationship between the battery capacity and the number of cycles, when the number of cycles of the battery increases, the capacity decreases slightly. the

As shown in Figure 9, the mains N2 line, L2 line and the output line N10, L10 of the off-grid inverter 4 are selected through the selection switch SA1, which are mutually backup, and are used for the PLC controller 5, the battery management system 6 and the load And provide power. the

As shown in Figure 10, the battery management system 6 includes a signal acquisition unit, a rectification unit and a communication unit; the signal acquisition unit collects the signals of the energy storage battery pack through ports B+, B1 to B20, and through T1+, T1-, T2+, T2- The port collects temperature signals; according to the number of batteries, there is no less than one battery acquisition module, and a maximum of 126 acquisition modules can be connected. the

As can be seen from Figures 1 and 2, the intelligent energy storage machine of the present invention is composed of the following main parts: energy storage battery pack, touch screen 2, grid-connected inverter 3, off-grid inverter 4, PLC controller 5, The battery management system 6 (BMS), the two-way smart watt-hour meter 7, the wind-solar hybrid charger 8, the low-voltage distributor 9, and the cabinet 10 are composed of parts. Under the management of the PLC controller 5, the household electricity purchase and power generation are automatically realized. , storage, electricity consumption, electricity sales, intelligent control of household appliances, and two-way metering of electric energy consumption. In order to achieve the above functions, the product coordinates the work of each module through software programming, with the goal of prioritizing the use of secondary energy and saving power consumption, and comprehensively considering factors such as off-peak power consumption, power backup, and intelligent control. the

The main components are explained in detail as follows:

Wind-solar hybrid controller: Mainly after the wind-power is rectified and voltage-regulated, the electric energy is stored in the energy storage battery in the form of direct current. The working principle is as follows: 1. The wind generator generates unstable alternating current under the wind force Diode sorting, capacitor filtering, DC voltage stabilization processing, etc., output stable DC voltage, and the DC voltage is connected to the battery. When the battery loses power, the battery is charged by wind power; /DC voltage stabilization processing, the output is connected to the battery, and when the battery loses power, the battery is charged by the solar panel. In order to ensure the efficiency and safety of the system, the system also needs to add auxiliary circuits such as brake protection, unloading circuit, and alarm indication. the

Grid-connected inverter: It mainly outputs the energy in the energy storage battery to the grid. Since the battery stores DC power, it needs to pass through the inverter equipment to obtain AC power with the same frequency, voltage and phase angle as the grid; grid-connected inverter The control element is an MCU control system, the power device is an IGBT device, and the auxiliary circuit includes a booster unit, a filter unit, a detection unit, a communication unit and an alarm unit. The low power is generally single-phase AC220V output, and the high power can be 3AC output. The product design reserves the power adjustment function, has "island" protection, and has programmable on-off function. the

Off-grid inverter: The biggest difference from the grid-connected inverter is that it can work independently from the grid. The role of the intelligent energy storage device is to output stable AC power to meet the load. The equipment input is composed of AC input and DC Battery input, when the mains power is normal, the AC input is stabilized and filtered, and directly output to the load end. When the mains power failure (or peak power consumption), it will switch to the battery power supply instantly, and the switching time is ≤10ms, while ensuring the back-end The electrical appliances continue to work normally and meet the functions of the uninterruptible power supply. the

Two-way smart watt-hour meter: adopts large-scale integrated circuits, mature software algorithms, low-power design and SMT technology, designed and manufactured based on relevant international and domestic standards, the meter has the functions of measurement, display, communication and detection, and can be accurately divided Timely measurement of forward and reverse active energy, and accurate real-time detection of parameters such as voltage, current, active power, power factor, frequency, etc., can be widely used in low-voltage electric energy time-of-use measurement. the

Touch screen: The 4-wire resistive industrial touch screen that has been widely used in the market is adopted. The touch screen meets the needs of industrial sites. The software programming adopts a special programming software editing platform. The screen is sensitive to touch, high in resolution, and has a storage capacity of 128MB. Can meet the control and monitoring display functions. the

PLC controller: PLC is the core control part of the coordinated control of each module. Through software programming, the modules are connected by means of RS485 communication. According to the monitored battery parameters, setting parameters, and output requirements, the goal is low-carbon environmental protection and cost saving. , to formulate internal control strategies. the

Battery management system BMS: In order to improve the utilization rate of the battery and prolong the life of the battery, the lithium battery needs to add a lithium battery management system. The battery management system monitors the voltage, temperature and current of the single battery in real time, and outputs corresponding Control, such as thermal management and balance management, makes the battery work within a reasonable temperature range, makes the battery capacity strive to store the maximum power, improves the consistency of the battery, and prolongs the cycle life. At the same time, the battery management system calculates the remaining power of the battery based on the monitoring data , participate in the system control output, etc. the

The working method of the intelligent energy storage machine, which includes the following steps:

① When the mains power is in normal state, the capacity of the energy storage battery pack is less than the lower limit of discharge, and the current low electricity price period, the control system instructs the mains power to charge the energy storage battery pack. When the mains power is charged, the capacity of the energy storage battery pack reaches the set value Set the upper limit, stop the mains charging;

②When the mains power is in normal state, the capacity of the energy storage battery pack is greater than the lower limit of discharge and not greater than the upper limit of wind and solar charging, and at the same time it is currently in the peak electricity price period, the solar energy device and the wind energy device charge the energy storage battery pack and disconnect the grid at the same time. Electric power supply, intelligent energy storage machine inverter output, providing power for loads, reducing electricity expenses;

③When the mains power is in a normal state, the capacity of the energy storage battery pack is greater than the set inverter upper limit, and it is currently in the peak electricity price period, the control system instructs the grid-connected inverter to output and "sell electricity" to the grid. the

As shown in Figure 5, the working method of the intelligent energy storage machine includes the following specific working steps:

Step s1: Start the intelligent energy storage machine and start the work;

Step s2: Determine whether the utility power is in a normal state, if so, go to step s6, if not, go to step s3;

Step s3: Determine whether the energy storage battery pack is in a low-voltage state, if so, go to step s5, if not, go to step s4;

Step s4: The off-grid inverter works and outputs stable AC power, which meets the needs of household appliances;

Step s5: turn off the intelligent energy storage machine;

Step s6: Determine whether the energy storage battery pack is in a low-voltage state, if so, go to step s7, if not, go to step s9;

Step s7: Determine whether the utility power is in the valley power period, if so, go to step s8, otherwise go to step s9;

Step s8: Mains electricity charges the energy storage battery pack, and enters step s9;

Step s9: Determine whether the energy storage battery pack is in a high-voltage state, if so, go to step s10, if not, go to step s11, step s12;

Step s10: the solar energy device and the wind energy device stop charging the energy storage battery pack;

Step s11: The solar energy device and the wind energy device charge the energy storage battery pack, and proceed to step s9 to judge again;

Step s12: Determine whether the utility power is in the peak power period, if so, go to step s13, if not, go to step s14;

Step s13: Determine whether the energy storage battery pack is in a normal state, if so, go to step s15, s16, if not, go to step s14;

Step s14: powered by mains;

Step s15: The grid-connected inverter outputs the energy in the energy storage battery to the grid to sell electricity;

Step s16: The energy storage battery pack supplies power to the load. the

The specific implementation methods listed above are non-limiting, and for those skilled in the art, various improvements and changes made without departing from the scope of the present invention belong to the protection scope of the present invention. the

Claims (10)

1. Intelligent energy storage machine, include cabinet shell (10), control system, energy source device and energy storage device: described energy source device is used to load that the energy is provided; It is characterized in that:

Described energy source device includes spectral energy unit, wind energy plant and civil power;

Described spectral energy unit be used for to be collected solar energy, and is the Conversion of Energy that comprises in the sunlight electric energy by opto-electronic conversion;

The mechanical energy that described wind energy plant is used for wind-force is comprised is converted to electric energy; The electrical power storage that spectral energy unit and wind energy plant produce is in energy storage device;

Described energy storage device is a kind of energy-storage battery group (1), and described energy-storage battery group (1) is used for storing spectral energy unit and the energy of wind energy plant generation and the commercial power charged energy;

Described control system includes: wind/light complementation controller (8), combining inverter (3), from net inverter (4), PLC controller (5), battery management system (6) and Bidirectional intelligent kilowatt-hour meter (7);

Described wind/light complementation controller (8) is a kind of energy conversion device, described spectral energy unit and wind energy plant are controlled and are adjusted by wind/light complementation controller and the DC power supply of output voltage stabilization is charged to the energy-storage battery group, electrical power storage in the energy-storage battery group;

Described combining inverter (3) is used for detecting in real time the parameter of civil power, realizes the energy inversion output of energy-storage battery group is fed back to civil power;

Describedly be used for to realize direct current to the conversion and control of alternating current from net inverter (4), when civil power was stopped power supply, switching to fast the energy-storage battery group from the net inverter was the load supplying power supply, and guarantee load electricity consumption is uninterrupted;

Described PLC controller (5), it is the core control section that the Intelligent energy storage machine all modules is coordinated control, mode with communication connects modules, according to battery parameter, setup parameter, the output demand of monitoring, and formulation and the internal control instruction of exporting to all modules;

Described battery management system (6), for the protection of with control described energy-storage battery group; Parameter and the characteristic point temperature of battery management system Real-Time Monitoring, supervision cell, battery management system calculates battery dump energy according to Monitoring Data simultaneously, exports corresponding control and management pattern for monitoring result;

Described Bidirectional intelligent kilowatt-hour meter (7) is used for the electric energy bidirectional measuring, simultaneously can the tou power price charging;

Described energy-storage battery group (1), wind/light complementation controller (8), combining inverter (3), all be arranged in the upper or inner chamber of cabinet shell (10) from net inverter (4), PLC controller (5), battery management system (6) and Bidirectional intelligent kilowatt-hour meter (7).

2. Intelligent energy storage machine as claimed in claim 1, it is characterized in that: the front of described cabinet shell (10) is provided with touch-screen (2), is used for showing each parameter situation of Intelligent energy storage machine and as the human-computer interaction input port.

3. Intelligent energy storage machine as claimed in claim 2, it is characterized in that: described control system includes: low-voltage distribution device (9) and charger (11).

4. Intelligent energy storage machine as claimed in claim 3, it is characterized in that: described Bidirectional intelligent kilowatt-hour meter (7) is electrically connected with the city by switch QF0, whether auxiliary relay KA20 connects mains supply, normal for detection of civil power, and information is sent to the PLC controller; Charger (11) one ends connect N line and the L1 line of civil power, and the other end connects dc bus, is provided with protection switch QF1 and controllable switch KA1 on the line between the L1 line of charger (11) and civil power; Combining inverter (3) one ends connect N line and the L1 line of civil power, and the other end connects dc bus, is provided with protection switch QF2 and controllable switch KA2 on the line between the L1 line of combining inverter (3) and civil power; The N line and the L1 line that connect civil power from net inverter (4) one ends, the other end connects dc bus, on the line between the L1 line of net inverter (4) and civil power, be provided with protection switch QF3, have outlet line N10 and L10 from net inverter (4); The two ends of energy-storage battery group (1) connect respectively electrode line and the negative line of dc bus, and the centre is provided with the shunt (14) that can detect direct current; The two ends of wind/light complementation controller (8) connect respectively electrode line and the negative line of dc bus, and the centre is provided with the diode (15) of guaranteeing the electric current one-way flow; Wind/light complementation controller (8) has spectral energy unit direct current input interface and wind energy plant three-phase alternating current input interface; Civil power is by N2 line and L2 alignment load out-put supply.

5. such as any one described Intelligent energy storage machine in the claim 1 to 4, it is characterized in that: described Intelligent energy storage machine is reserved the ethernet communication interface, can access home network or link Internet realization remote monitoring and energy consumption statistic, wherein PLC controller (5) includes two CPU main frames and a plurality of expansion module, connect in Ethernet TCP/IP mode each other and realize exchanges data by switch (13), remote monitoring computer (12) is with TCP/IP and PLC communication, PLC controller (5) and battery management system (6), combining inverter (3), realize exchanges data with the Free communication modes between touch-screen (2) and the Bidirectional intelligent kilowatt-hour meter (7), communication interface is RS485.

6. Intelligent energy storage machine as claimed in claim 5 is characterized in that: ferric phosphate lithium cell or lithium titanate battery more than described energy-storage battery group (1) includes one group.

7. Intelligent energy storage machine as claimed in claim 5, it is characterized in that: civil power N2 line, L2 line and between outlet line N10, the L10 of net inverter (4), select by selector switch SA1, for subsequent use each other, and be PLC controller (5), battery management system (6) and load and power supply is provided.

8. Intelligent energy storage machine as claimed in claim 5, it is characterized in that: described battery management system (6) includes signal gathering unit, rectification unit and communication unit; Signal gathering unit is by the signal of B+, B1 to B20 port processing energy-storage battery group, by T1+, T1-, T2+, T2-p port processing temperature signal; Be no less than 1 battery acquisition module according to how much being provided with of battery, can connect at most 126 acquisition modules.

9. such as the method for work of any one described Intelligent energy storage machine in the claim 1 to 4, it is characterized in that: comprise the steps:

1. work as civil power and be in normal condition, the capacity of energy-storage battery group is less than the discharge lower limit, and current electricity price at a low ebb is during the period, and control system instruction civil power charges to the energy-storage battery group, the energy-storage battery pool-size reaches the upper limit of setting after commercial power charged, stops commercial power charged;

2. work as civil power and be in normal condition, the capacity of energy-storage battery group is greater than the discharge lower limit and be not more than honourable charging upper limit, the current peak electricity tariff that is in of while during the period, spectral energy unit, wind energy plant charge to the energy-storage battery group, disconnect simultaneously mains supply, Intelligent energy storage machine inversion output, for load provides power supply, reduce electric cost expenditure;

3. be in normal condition when civil power, the capacity of energy-storage battery group is greater than setting the inversion upper limit, and currently is in the peak electricity tariff period, the output of control system instruction combining inverter, and " selling electricity " gives electrical network.

10. the method for work of Intelligent energy storage machine as claimed in claim 9 is characterized in that: comprise following specific works step:

Step s1: start Intelligent energy storage machine, the work beginning;

Step s2: judge whether civil power is in normal condition, enters in this way step s6, as otherwise enter step s3;

Step s3: judge whether the energy-storage battery group is in low-pressure state, enters in this way step s5, as otherwise enter step s4;

Step s4: from the work of net inverter, the AC power of stable output satisfies the use of household electrical appliance;

Step s5: close Intelligent energy storage machine;

Step s6: judge whether the energy-storage battery group is in low-pressure state, enters in this way step s7, as otherwise enter step s9;

Step s7: judge whether civil power is in the paddy electricity period, enters in this way step s8, as otherwise enter step s9;

Step s8: civil power is the charging of energy-storage battery group, enters step s9;

Step s9: judge whether the energy-storage battery group is in high pressure conditions, enters in this way step s10, as otherwise enter step s11, step s12;

Step s10: spectral energy unit, wind energy plant stop the charging of energy-storage battery group;

Step s11: spectral energy unit, wind energy plant enter step s9 and again judge the charging of energy-storage battery group;

Step s12: judge whether civil power is in the peak electricity period, enters in this way step s13, as otherwise enter step s14;

Step s13: judge whether the energy-storage battery group is in normal condition, enters in this way step s15, s16, as otherwise enter step s14;

Step s14: by mains-supplied;

Step s15: combining inverter outputs to electrical network with the energy in the energy-storage battery and sells electricity;

Step s16: the energy-storage battery group is load supplying.

Images