CN108448699A - The charge/discharge control method of direct current micro-grid system and its electric vehicle - Google Patents
The charge/discharge control method of direct current micro-grid system and its electric vehicle Download PDFInfo
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- CN108448699A CN108448699A CN201810271620.7A CN201810271620A CN108448699A CN 108448699 A CN108448699 A CN 108448699A CN 201810271620 A CN201810271620 A CN 201810271620A CN 108448699 A CN108448699 A CN 108448699A
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- electric vehicle
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- distribution module
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- 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
- H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L55/00—Arrangements for supplying energy stored within a vehicle to a power network, i.e. vehicle-to-grid [V2G] arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The present invention relates to a kind of direct current micro-grid system and its charge/discharge control method of electric vehicle, which includes：At least one Bidirectional charging-discharging device being connected with DC bus；At least one electric vehicle；Piconet controller, for being monitored in real time to Bidirectional charging-discharging device, power generator and load device, and when judging that Bidirectional charging-discharging device accesses electric vehicle, the remaining capacity information of electric vehicle is obtained by Bidirectional charging-discharging device, and monitoring information and preset peak load shifting strategy is combined to judge whether electric vehicle meets charge/discharge condition, if meeting charge condition, controls Bidirectional charging-discharging device and charge for electric vehicle；If meeting discharging condition, controls electric vehicle and discharge to Bidirectional charging-discharging device.Implement technical scheme of the present invention, the effect of electric vehicle peak load shifting in direct current micro-grid system can be played, improve the energy utilization rate and economy of direct current micro-grid system.
Description
Technical field
The present invention relates to the charge and discharge of electric vehicle field more particularly to a kind of direct current micro-grid system and its electric vehicle is automatically controlled
Method processed.
Background technology
As world energy sources crisis and problem of environmental pollution are increasingly serious, the development and utilization of renewable distributed energies is got over
To be more taken seriously.In order to avoid distributed generation resource direct grid-connected causes to impact to bulk power grid stable operation, micro- electricity is just proposed
The concept of net, the direct-current micro-grid refer to that small-sized distribution system is made of distributed generation resource and energy storage device etc., both can be with
Bulk power grid networking operation, also can isolated operation, be the important component of intelligent grid.And direct-current micro-grid is with DC distribution
Form, the controllable microgrid for being connected distributed generation resource by DC bus.
In addition, growing with human society, energy and environment problem is more and more prominent, in order to ensure safety and turn
Type low-carbon economy, countries in the world are generally using Development of EV as the important channel for solving the problems, such as energy and environment, China's handle
Electric vehicle is classified as strategic emerging industries, carries forward vigorously its commercial application.The battery of electric vehicle is as a kind of movement point
The energy storage device for dissipating formula, can not only absorb electric energy from power grid, but also can be to power grid restoring electrical energy, therefore, and electric vehicle can be with
Participate in the operation and control of electric system.
But there is no consider to participate in adjusting using electric vehicle as moving distributing power supply in existing direct current micro-grid system
Degree management, the peak load shifting of direct current micro-grid system can not be participated in by also allowing for electric vehicle, so as to cause that cannot play well
The functional potential and economic value of electric vehicle.
Invention content
To solve not accounting in the prior art to participate in asking for management and running using electric vehicle as moving distributing power supply
Topic, the present invention provide the charge/discharge control method of a kind of direct current micro-grid system and its electric vehicle.
The technical solution adopted by the present invention to solve the technical problems is：A kind of direct current micro-grid system is constructed, including respectively
The power generator and load device being connected with DC bus, the direct current micro-grid system further include：
At least one Bidirectional charging-discharging device being connected with the DC bus；
At least one electric vehicle；
Piconet controller, in real time to the Bidirectional charging-discharging device, the power generator and the load device into
Row monitoring, and when judging that the Bidirectional charging-discharging device accesses electric vehicle, obtained by the Bidirectional charging-discharging device
The remaining capacity information of the electric vehicle, and judge the electric vehicle in conjunction with monitoring information and preset peak load shifting strategy
Whether charge/discharge condition is met, if meeting charge condition, it is that the electric vehicle fills to control the Bidirectional charging-discharging device
Electricity；If meeting discharging condition, controls the electric vehicle and discharge to the Bidirectional charging-discharging device.
Preferably, the quantity of the Bidirectional charging-discharging device is multiple, moreover,
The piconet controller is additionally operable to judging multiple Bidirectional charging-discharging devices while the corresponding electronic vapour of access
Vehicle, and the multiple electric vehicle is simultaneously when meeting charge condition, to the multiple Bidirectional charging-discharging devices broadcasting charging instruction；
Alternatively, judging multiple Bidirectional charging-discharging devices while accessing corresponding electric vehicle, and the multiple electric vehicle is simultaneously
When meeting discharging condition, discharges and instruct to the multiple Bidirectional charging-discharging devices broadcasting.
Preferably, the piconet controller is additionally operable to when being incorporated into the power networks, judge current time be in high rate period or
In low rate period, if being more than first threshold in the remaining capacity of high rate period and the electric vehicle, it is determined that the electricity
Electrical automobile meets discharging condition；If being less than second threshold in the remaining capacity of low rate period and the electric vehicle, it is determined that
The electric vehicle meets charge condition, wherein first threshold is more than second threshold；And/or
The piconet controller, is additionally operable to when being incorporated into the power networks, if judging that the power generation fills according to the monitoring information
The generated output set reaches third threshold value, and the remaining capacity of the electric vehicle is less than second threshold or the electric vehicle
When charging priority is higher than preset value, it is determined that the electric vehicle meets charge condition；And/or
The piconet controller is additionally operable to judging to be currently at isolated power grid, and the residue electricity of the electric vehicle
When amount is more than first threshold, determine that the electric vehicle meets discharging condition.
Preferably, the Bidirectional charging-discharging device includes direct current rifle, two-way DC/DC modules and power distribution module, wherein
The first port of the two-way DC/DC modules connects the DC bus, and the second port of the two-way DC/DC modules connects institute
The first port of power distribution module is stated, the second port of the power distribution module passes through the direct current rifle and the electronic vapour
Vehicle is connected；Moreover,
The power distribution module, for receiving the charge/discharge instruction that the piconet controller issues, and with the electricity
When the BMS modules of electrical automobile successfully carry out handshake communication, the operating mode and running parameter of the two-way DC/DC modules are configured,
Wherein, the operating mode includes charge mode, discharge mode, and the running parameter includes current value, voltage value.
Preferably, the power distribution module is additionally operable to receiving the charge/discharge instruction that the piconet controller issues
Afterwards, self-test is carried out, if self-test passes through, judges whether successfully carry out handshake communication with the BMS modules of the electric vehicle, and
When success, the operating mode and running parameter of the two-way DC/DC modules are configured.
Preferably, the power distribution module includes switching device, and the switching device is connected to the two-way DC/DC moulds
Between the second port of block and the direct current rifle, moreover,
The power distribution module is additionally operable in the charge/discharge END instruction for receiving the piconet controller and issuing, or
Person sends halt instruction when judging that itself or the two-way DC/DC modules are broken down to the two-way DC/DC modules,
And the switching device is turned off, and send charge/discharge to the BMS modules of the electric vehicle and stop information.
Preferably, the power distribution module is additionally operable to the suspension sent in the BMS modules for receiving the electric vehicle
Or when end mark, halt instruction is sent to the two-way DC/DC modules, and turn off the switching device.
Preferably, the quantity of the two-way DC/DC modules is multiple, and the quantity of the power distribution module is one, and
And the first port of each two-way DC/DC modules is separately connected the DC bus, each two-way DC/DC modules
Second port be separately connected the first port of the power distribution module, the third port of the power distribution module connects institute
State piconet controller.
Preferably, the quantity of the two-way DC/DC modules is identical with the quantity of the power distribution module, and is respectively more
A, one of power distribution module is main power distribution module, other power distribution modules be from power distribution module,
In, the first port of each two-way DC/DC modules respectively connects the DC bus, each two-way DC/DC moulds
The second port of block connects the first port of corresponding power distribution module, moreover, the third of the main power distribution module
Port connects the piconet controller, and the 4th port of the main power distribution module is separately connected described from power distribution module
Third port.
The present invention also constructs a kind of charge/discharge control method of electric vehicle, includes the following steps：
Bidirectional charging-discharging device, power generator and load device are monitored in real time, to obtain monitoring information；
When judging that the Bidirectional charging-discharging device accesses electric vehicle, institute is obtained by the Bidirectional charging-discharging device
State the remaining capacity information of electric vehicle；
Judge the electric vehicle according to the remaining capacity information, the monitoring information and preset peak load shifting strategy
Whether charge/discharge condition is met；
If meeting charge condition, controls the Bidirectional charging-discharging device and charge for the electric vehicle；
If meeting discharging condition, controls the electric vehicle and discharge to the Bidirectional charging-discharging device.
Implement technical scheme of the present invention, Bidirectional charging-discharging device is accessed in existing direct-current grid, moreover, microgrid
Controller monitors two-way charging unit, power generator and load device in real time, and combine electric vehicle remaining capacity information and
Preset peak load shifting policy control Bidirectional charging-discharging device carries out charge or discharge to electric vehicle, to play electric vehicle
The effect of peak load shifting in direct current micro-grid system improves the energy utilization rate and economy of direct current micro-grid system.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the building-block of logic of direct current micro-grid system embodiment one of the present invention；
Fig. 2 is the building-block of logic of direct current micro-grid system embodiment two of the present invention；
Fig. 3 is the building-block of logic of direct current micro-grid system embodiment three of the present invention；
Fig. 4 is the building-block of logic of direct current micro-grid system example IV of the present invention；
Fig. 5 is the charging flow figure in the charge/discharge control method embodiment one of electric vehicle of the present invention；
Fig. 6 is the discharge flow path figure in the charge/discharge control method embodiment one of electric vehicle of the present invention；
Fig. 7 is the end flow chart in the charge/discharge control method embodiment one of electric vehicle of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is the building-block of logic of direct current micro-grid system embodiment one of the present invention, the direct current micro-grid system packet of the embodiment
Piconet controller 10, power generator 40, load device 50, m Bidirectional charging-discharging device 20 and m electric vehicle 30 are included, m is to appoint
Meaning natural number.Power generator 40 is, for example, diesel power generation equipment, wind power plant, steam-electric power plant etc., load device
50 be, for example, dc motor, and certainly, in other embodiments, the quantity of power generator 40 and load device 50 is alternatively more
It is a.
In this embodiment, Bidirectional charging-discharging device 20, power generator 40 and load device 50 respectively by power line with
DC bus 00 is connected.Each electric vehicle 30 is connected by direct current rifle line with a Bidirectional charging-discharging device 20, for example, electronic
Automobile 1 is connected by direct current rifle line with Bidirectional charging-discharging device 1, and electric vehicle m passes through direct current rifle line and Bidirectional charging-discharging device m
It is connected.Piconet controller 10 passes through CAN bus 01 and 50 phase of Bidirectional charging-discharging device 20, power generator 40 and load device respectively
Even, moreover, the piconet controller 10 is in real time supervising Bidirectional charging-discharging device 20, power generator 40 and load device 50
Control, and when judging that Bidirectional charging-discharging device 20 accesses electric vehicle 30, electronic vapour is obtained by Bidirectional charging-discharging device 20
The remaining capacity information of vehicle 30, and combine monitoring information and preset peak load shifting strategy judge electric vehicle whether meet fill/
Discharging condition controls Bidirectional charging-discharging device 20 and charges for electric vehicle 30 if meeting charge condition；If meeting electric discharge item
Part then controls electric vehicle 30 and discharges to Bidirectional charging-discharging device 20.Judge charge/discharge item about according to peak load shifting strategy
Part.
In this embodiment, the function of piconet controller 10 is mainly reflected in following two aspects：One, monitoring bidirectional charge and discharges
The state of electric installation 20, power generator 40, load device 50, and the input-output power of DC bus 00 is scheduled, it is real
The peak load shifting strategy of existing electric vehicle 30；Two, are used to issue charge and discharge instruction to Bidirectional charging-discharging device 20.It is filled out about peak clipping
Paddy strategy, in a specific example, direct current micro-grid system is incorporated into the power networks, if meeting the following conditions simultaneously：1. power generator
Generated output reaches upper limit value；2. the remaining capacity of electric vehicle is more than first threshold；3. the electric power of load device increases
Or demand power will increase, it is determined that the electric vehicle meets discharging condition, can take electricity from the electric vehicle at this time, meets one
Divide the electricity consumption of load device；If meeting the following conditions simultaneously：1. the generated output of power generator reaches lower limiting value；2. electric vehicle
Remaining capacity be less than second threshold；3. the electric power of load device reduces or demand power is smaller, it is determined that this is electronic
Automobile meets charge condition, can charge at this time to the electric vehicle.
By the technical solution of the embodiment, Bidirectional charging-discharging device 20 is accessed in existing direct-current grid, moreover,
Piconet controller 10 monitors two-way charging unit 20, power generator 40 and load device 50 in real time, and combines the surplus of electric vehicle
Remaining information about power and preset peak load shifting policy control Bidirectional charging-discharging device 20 carry out charge or discharge to electric vehicle 30,
To play the effect of the peak load shifting in direct current micro-grid system of electric vehicle 30, the using energy source of direct current micro-grid system is improved
Rate and economy.
In one alternate embodiment, if the quantity of the Bidirectional charging-discharging device in Fig. 1 is multiple, and there are more electronic vapour
When vehicle 30 accesses corresponding Bidirectional charging-discharging device 20 simultaneously, piconet controller 10 is additionally operable to judging multiple Bidirectional charging-dischargings
Device 20 accesses corresponding electric vehicle 30 simultaneously, and when multiple electric vehicles 30 meet charge condition simultaneously, to multiple two-way
Charge and discharge device 20 broadcasts charging instruction；Alternatively, judging multiple Bidirectional charging-discharging devices 20 while accessing corresponding electronic
Automobile 30, and multiple electric vehicles 30 broadcast electric discharge instruction simultaneously when meeting discharging condition to multiple Bidirectional charging-discharging devices 20.
In this embodiment, piconet controller 10 can realize that the group of electric vehicle 30 fills the control that group is put.Certainly, other
It, may one or several electronic vapour when having more electric vehicles while accessing corresponding Bidirectional charging-discharging device in embodiment
Vehicle meets charge condition, and some other electric vehicles meet discharging condition, at this point, can be by one or more electric vehicles
Energy is shifted to other vehicles, so that the charging of certain electric vehicles and the electric discharge of other electric vehicle are in entire direct-current micro-grid
It in system and deposits, by the input and output ratio of 10 equilibrium energy of piconet controller, entire power grid is not had an impact.
Further, piconet controller 10 may be used also other than the charge and discharge according to peak load shifting policy control electric vehicle
Charge and discharge control is realized according to the charge requirement etc. of power grid time-of-use tariffs characteristic, electric vehicle.Specifically, piconet controller 10
It can be according to one or more of following combination to determine whether meeting charge/discharge condition：
1. when being incorporated into the power networks, judge that current time is in high rate period or in low rate period, if in high electricity price
The remaining capacity of section and electric vehicle is more than first threshold, it is determined that electric vehicle meets discharging condition；If in low rate period
And the remaining capacity of electric vehicle is less than second threshold, it is determined that electric vehicle meets charge condition, wherein first threshold is more than
Second threshold；
2. when being incorporated into the power networks, if judge that the generated output of power generator reaches third threshold value according to monitoring information, and
When the remaining capacity of electric vehicle is less than the charging priority of second threshold or electric vehicle higher than preset value, it is determined that electronic vapour
Vehicle meets charge condition, about priority, it should be noted that, priority can be divided into the value of multiple grades according to practical application,
For example, priority shares three grades, priority value is respectively 3,2,1, stipulated that digital bigger, electricity corresponding to priority
The charging priority level of electrical automobile is higher.For example, in the embodiment, preset value may be configured as 2, when judging some electric vehicle
Charging priority be 3 when, be higher than preset value 2, then can determine that the electric vehicle meets charge condition；And/or
3. judging to be currently at isolated power grid, and when the remaining capacity of electric vehicle is more than first threshold, electricity is determined
Electrical automobile meets discharging condition.
In this embodiment, for condition 1, when power grid is in the time-of-use tariffs period, electric vehicle can be in high electricity price
Period sells electricity to direct current micro-grid system, charges from direct current micro-grid system in low rate period, realizes electric vehicle charge and discharge
Economic value；For condition 2, in the case of direct current micro-grid system generated output is limited, and electric vehicle charge requirement is larger
Or priority it is higher when, can preferentially meet be badly in need of charging vehicle or the lower vehicle of electricity；For condition 3, work as direct-current micro-grid
When system isolated power grid, electric vehicle can be used as non-firm power, when its remaining capacity is larger, can be put to direct current micro-grid system
Electricity is used for load.Finally it should be noted that, above several control strategies and aforementioned peak load shifting strategy can individually make
With, also can be used in combination, to realize the energy between electric vehicle dispatch.
Fig. 2 is the building-block of logic of direct current micro-grid system embodiment two of the present invention, in this embodiment, Bidirectional charging-discharging dress
It includes direct current rifle (not shown), two-way DC/DC modules 21 and power distribution module 22 to set 20.Electric vehicle 30 includes BMS
Module 31, Power entry module 32 and power battery 33.Piconet controller 10 connects power distribution module 22 by CAN bus 01.It is double
DC bus 00 is connected by power line 06 to the first port of DC/DC modules 21, the second port of two-way DC/DC modules 21 connects
The first port of power distribution module 22 is connect, and is connected with two kinds of cable between the two ports：CAN bus 02, direct current
Power line 05.The second port of power distribution module 22 is connected by direct current rifle with electric vehicle 30, similarly, packet in direct current rifle
The interface there are two types of type is included, direct current rifle line also includes two kinds of cable：CAN bus 03 and dc power line 04.Specifically
Ground, when the direct current rifle of Bidirectional charging-discharging device 20 is inserted into electric vehicle 30, power distribution module 22 is connected by CAN bus 03
BMS modules 31, power distribution module 22 also connect Power entry module 32 by dc power line 04, and Power entry module 32 also passes through power
Busbar connects power battery 33.In addition, BMS modules 31 also connect Power entry module 32 by control signal wire, power battery 33 is also
BMS modules 31 are connected by acquiring signal wire.
In this embodiment, power distribution module 22 is used to receive the charge/discharge that piconet controller 10 issues and instructs, and
When successfully carrying out handshake communication with the BMS modules 31 of electric vehicle, the operating mode and work ginseng of two-way DC/DC modules 21 are configured
Number, wherein operating mode includes charge mode, discharge mode, and running parameter includes current value, voltage value.That is, the power point
With module as the tie between two-way DC/DC modules 21, piconet controller 10 and BMS modules 31, the capacity of battery can be obtained
Battery data before and after information and battery car charging and in charging, meanwhile, it can be according to the charge-discharge power demand voltage and electricity of battery
Stream configures output or input voltage and the current parameters of two-way DC/DC modules 21, adjusts the charge/discharge of electric vehicle in real time
Voltage and current.
In addition, in this embodiment, two-way DC/DC modules 21 realize power conversion when electric vehicle provides charge/discharge,
Direct current on DC bus is conveyed to electric vehicle, or the battery capacity stored on electric vehicle is transported to direct current mother
Line realizes that energy is bi-directionally transmitted.Power battery 33 is the unit that energy is exported and stored；BMS modules 31 are used for power battery
The information such as 33 voltage, temperature, insulation are monitored, and realize the pipe of fault alarm and protection, heat management and charge and discharge logic
Control；Power entry module 32 is the execution unit of 33 charge and discharge logic of power battery.
Further, power distribution module 22 is additionally operable to after receiving the charge/discharge instruction that piconet controller 10 issues,
Carry out self-test, if self-test passes through, judge whether successfully carry out handshake communication with the BMS modules 31 of electric vehicle 30, and at
When work(, the operating mode and running parameter of two-way DC/DC modules 21 are configured.
In one alternate embodiment, power distribution module includes switching device, which is connected to corresponding double
To between the second port and direct current rifle of DC/DC modules, moreover, power distribution module 22 is additionally operable to receiving piconet controller
The charge/discharge END instruction issued, alternatively, when judging that itself or two-way DC/DC modules 21 are broken down, to two-way DC/
DC modules 21 send halt instruction, and turn off switching device, and send charge/discharge to BMS modules 31 and stop information.Further
Ground, power distribution module 22 are additionally operable in suspension or the end mark for receiving the transmission of BMS modules 31, to two-way DC/DC moulds
Block 21 sends halt instruction, and turns off switching device.
Fig. 3 is the building-block of logic of direct current micro-grid system embodiment three of the present invention, the direct current micro-grid system phase of the embodiment
Than embodiment shown in Fig. 2, the only difference is that：The quantity of two-way DC/DC modules is n, and the quantity of power distribution module is
One, wherein n is the natural number more than 1.Moreover, two-way DC/DC modules 211,212 ..., the first port of 21n is separately connected
DC bus, two-way DC/DC modules 211,212, the second port of 21n are separately connected the first port of power distribution module 22,
The second port of power distribution module 22 is connected by direct current rifle with electric vehicle, the third port connection of power distribution module 22
Piconet controller 10.
In this embodiment, multiple two-way DC/DC modules 211,212 ..., 21n be in parallel, and by a power distribution mould
Block 22 and multiple two-way DC/DC modules 211,212 ..., 21n be applied in combination, make power distribution module 22 that can control respectively multiple
Two-way DC/DC modules 211,212 ..., 21n.Specifically, piconet controller 10 sends charge/discharge to power distribution module 22 and refers to
It enables, is communicated with BMS modules 31 by power distribution module 22, acquisition charge-discharge power demand voltage and demand current, and by demand current
Through dividing equally handle after, by CAN bus broadcast to multiple two-way DC/DC modules 211,212 ..., 21n.Then, this is more
A two-way DC/DC modules 211,212 ..., 21n configured respectively according to respective demand voltage and demand current, with to electricity
Electrical automobile charge or discharge.
Fig. 4 is the building-block of logic of direct current micro-grid system example IV of the present invention, the direct current micro-grid system phase of the embodiment
Than embodiment shown in Fig. 2, the only difference is that：The quantity of two-way DC/DC modules and the quantity of power distribution module are respectively n
A, n is the natural number more than 1.Moreover, power distribution module 221 is main power distribution module, other power distribution modules
222 ..., 22n is from power distribution module.Each two-way DC/DC modules 211,212 ..., the first port of 21n respectively connects
Connect DC bus, each two-way DC/DC modules 211,212 ..., the second port of 21n connect corresponding power distribution module
221,222 ..., the first port of 22n, each power distribution module 221,222 ..., the second port of 22n by direct current rifle with
Electric vehicle is connected, it should be noted that, for main power distribution module 221, second port both connect including CAN bus herein
Mouthful, and include dc power interface, that is, the main power module 221 both connected BMS modules 31 by CAN bus, further through direct current
Power line connects Power entry module 32；And for from power distribution module 222 ..., 22n, second port only include dc power
Port, that is, each from power distribution module 222 ..., 22n only pass through dc power line connect Power entry module 32.That is,
Only main power distribution module 221 is communicated with BMS modules 31, obtains the charge-discharge power demand voltage and demand current of electric vehicle.Separately
Outside, the third port of main power distribution module 221 connects piconet controller 10, that is, only main power distribution module 221 is from microgrid
Controller 10 receives charge/discharge instruction.4th port of main power distribution module 221 is separately connected from power distribution module
222 ..., the third port of 22n, for from power distribution module 222 ..., 22n issue the works of corresponding two-way DC/DC modules
Operation mode and running parameter.Moreover, in this embodiment, the third port of main power distribution module 221 and the 4th port are same
Single port, that is, main power distribution module 221 not only received the charge/discharge that piconet controller 10 issues by the port and instructs, but also logical
Cross the port to it is each from power distribution module 222 ..., the third port of 22n send the Working moulds of corresponding two-way DC/DC modules
Formula and running parameter.Certainly, in other embodiments, the third port of main power distribution module 221 and the 4th port are alternatively
Two independent ports.
In this embodiment, multigroup two-way DC/DC modules and power distribution module are used in parallel, by power distribution module
221 and two-way DC/DC211 modules as main equipment, remaining power distribution module 222 ..., 22n and two-way DC/DC modules
212 ..., 21n is used as from equipment, forms the pattern of one master and multiple slaves.Moreover, piconet controller 10 gives main power distribution module
221 send charge/discharge instruction, are communicated with BMS modules 31 by main power distribution module 221, obtain charge-discharge power demand voltage and need
Seek electric current, and by demand current after dividing equally by CAN bus be sent to from power distribution module 222 ..., 22n.Then,
Each power distribution module according to demand voltage and demand current by bus configuration respectively corresponding to two-way DC/DC modules,
To realize to electric vehicle charge or discharge, the power demand of electric vehicle charge and discharge can be enhanced in this way.
The present invention also constructs a kind of charge/discharge control method of electric vehicle, which applies above
In direct current micro-grid system, and include the following steps：
Bidirectional charging-discharging device, power generator and load device are monitored in real time, to obtain monitoring information；
When judging that Bidirectional charging-discharging device accesses electric vehicle, electric vehicle is obtained by Bidirectional charging-discharging device
Remaining capacity information；
According to remaining capacity information, monitoring information and preset peak load shifting strategy judge electric vehicle whether meet fill/
Discharging condition；
If meeting charge condition, controls Bidirectional charging-discharging device and charge for electric vehicle；
If meeting discharging condition, controls electric vehicle and discharge to Bidirectional charging-discharging device.
Fig. 5 is the charging flow figure in the charge/discharge control method embodiment one of electric vehicle of the present invention, in the embodiment
Charging flow in, piconet controller control single channel electric vehicle charging.First, piconet controller can be real-time by CAN bus
Monitoring bidirectional charge and discharge device, power generator and load device, so, it can in a step 101, piconet controller detection is two-way to fill
The port status of the direct current rifle of electric discharge device, port status include access state or standby mode.In a step 102, judgement is
It is no to have electric vehicle access, if it is not, carrying out executing step 101；If so, in step 103 record direct current rifle port numbers and
State.Then, at step 104, judge whether to meet charge condition, for example, can be according to preset peak load shifting strategy, peak valley
Electricity Price Strategy, electric vehicle charge requirement strategy etc. are to determine whether meet charge condition, if so, thening follow the steps 105；If
It is no, then step 104 is executed again to continue waiting for.If the electric vehicle of access Bidirectional charging-discharging device meets charge condition,
Then in step 105, piconet controller issues charging instruction and gives Bidirectional charging-discharging device.
And for Bidirectional charging-discharging device, in step 106, power distribution module judges whether to receive charging instruction, if
It is no, then continue to execute step 106；If so, in step 107, power distribution module self-test, for example, checking insulation, failure
Deng；Then judge whether self-test passes through in step 108, if it is not, then terminating to charge, and report fail self-test reason；If so,
In step 109, carry out then whether handshake communication judges handshake communication in step 110 with the BMS modules of electric vehicle
Success, if it is not, then terminating to charge, and reports failure cause of shaking hands；If so, executing step 111.In step 111, power point
With module to two-way DC/DC modules configuration charge mode and charge parameter, then start to charge up in step 112.In charging
In the process, power distribution module can be with BMS module real-time, interactive charge datas, moreover, also logical with two-way DC/DC modules in real time
Letter corrects charging voltage and electric current, meanwhile, power distribution module also uploads charge data to piconet controller in real time.Then, exist
In step 113, judge whether charging terminates or stop, if it is not, then continuing to execute step 111；If so, terminating charging.
Fig. 6 is the discharge flow path figure in the charge/discharge control method embodiment one of electric vehicle of the present invention, in the embodiment
Discharge flow path in, piconet controller control single channel electric vehicle electric discharge.First, piconet controller can be real-time by CAN bus
Monitoring bidirectional charge and discharge device, power generator and load device, so, it can in step 201, piconet controller detection is two-way to fill
The port status of the direct current rifle of electric discharge device, port status include access state or standby mode.In step 202, judgement is
It is no to have electric vehicle access, if it is not, continuing to execute step 201；If so, in step 203 record direct current rifle port numbers and
State.Then, in step 204, judge whether to meet discharging condition, for example, can be according to preset peak load shifting strategy, peak valley
Electricity Price Strategy, electric vehicle electric discharge demand strategy etc. are to determine whether meet discharging condition, if so, thening follow the steps 205；If
It is no, then step 204 is executed again to continue waiting for.If the electric vehicle of access Bidirectional charging-discharging device meets discharging condition,
Then in step 205, piconet controller issues electric discharge instruction and gives Bidirectional charging-discharging device.
And for Bidirectional charging-discharging device, in step 206, power distribution module judges whether to receive electric discharge instruction, if
It is no, then continue to execute step 206；If so, in step 207, power distribution module self-test, for example, checking insulation, failure
Deng；Then judge whether self-test passes through in a step 208, if it is not, then terminating to discharge, and report fail self-test reason；If so,
In step 209, carry out then whether handshake communication judges handshake communication in step 210 with the BMS modules of electric vehicle
Success, if it is not, then terminating to discharge, and reports failure cause of shaking hands；If so, executing step 211.In step 211, power point
With module to two-way DC/DC modules configuration discharge mode and discharge parameter, then start to discharge in the step 212.In electric discharge
In the process, power distribution module can be with BMS module real-time, interactive discharge datas, moreover, also logical with two-way DC/DC modules in real time
Letter corrects discharge voltage and electric current, meanwhile, power distribution module also uploads discharge data to piconet controller in real time.Then, exist
In step 213, judge whether electric discharge terminates or stop, if it is not, then continuing to execute step 211；If so, terminating electric discharge.
Fig. 7 is the end flow chart in the charge/discharge control method embodiment one of electric vehicle of the present invention, in the embodiment
End flow in, piconet controller control single channel electric vehicle stop charge and discharge.First, in step 301, power distribution mould
Block judges whether to receive charge/discharge END instruction, if so, thening follow the steps 302；If it is not, thening follow the steps 304.In step 302
In, power distribution module issues halt instruction to two-way DC/DC modules, and turns off switching device.Then, in step 303, work(
Rate distributes a module to BMS modules and sends charge/discharge suspension information, and then terminates charge and discharge.In step 304, judge power point
With module or two-way DC/DC modules whether failure, if it is not, thening follow the steps 305；If so, thening follow the steps 302 and step 303.
In step 305, judge whether BMS modules send suspension or end mark, if so, thening follow the steps 306；If it is not, then again
Execute step 301.Within step 306, power distribution module issues halt instruction to two-way DC/DC power modules, and turns off and open
Device is closed, and then terminates charge and discharge.
It is last it should be noted that, the present invention does not limit step 301,304,305 executes sequence, in other embodiments
In, step 301,304,305 can execute in any order, that is, next step is executed when previous step judges no.Certainly, exist
In other embodiments, step 301,304,305 can be also performed simultaneously.
Above disclosed is only presently preferred embodiments of the present invention, cannot limit the right of the present invention with this certainly
Range, those skilled in the art can understand all or part of the processes for realizing the above embodiment, and according to right of the present invention
Equivalent variations made by it is required that, still belong to the scope covered by the invention.
Claims (10)
1. a kind of direct current micro-grid system, including the power generator and load device that are connected respectively with DC bus, which is characterized in that
The direct current micro-grid system further includes：
At least one Bidirectional charging-discharging device being connected with the DC bus；
At least one electric vehicle；
Piconet controller, for being supervised in real time to the Bidirectional charging-discharging device, the power generator and the load device
Control, and when judging that the Bidirectional charging-discharging device accesses electric vehicle, described in Bidirectional charging-discharging device acquisition
The remaining capacity information of electric vehicle, and whether judge the electric vehicle in conjunction with monitoring information and preset peak load shifting strategy
Meet charge/discharge condition, if meeting charge condition, controls the Bidirectional charging-discharging device and charge for the electric vehicle；If
Meet discharging condition, then controls the electric vehicle and discharge to the Bidirectional charging-discharging device.
2. direct current micro-grid system according to claim 1, which is characterized in that the quantity of the Bidirectional charging-discharging device is more
It is a, moreover,
The piconet controller is additionally operable to judging multiple Bidirectional charging-discharging devices while accessing corresponding electric vehicle, and
When the multiple electric vehicle meets charge condition simultaneously, to the multiple Bidirectional charging-discharging devices broadcasting charging instruction；Alternatively,
Judging multiple Bidirectional charging-discharging devices while accessing corresponding electric vehicle, and the multiple electric vehicle simultaneously put by satisfaction
When electric condition, discharges and instruct to the multiple Bidirectional charging-discharging devices broadcasting.
3. direct current micro-grid system according to claim 1, which is characterized in that
The piconet controller is additionally operable to when being incorporated into the power networks, and judges that current time is in high rate period or in low electricity price
Section, if being more than first threshold in the remaining capacity of high rate period and the electric vehicle, it is determined that the electric vehicle meets
Discharging condition；If being less than second threshold in the remaining capacity of low rate period and the electric vehicle, it is determined that the electronic vapour
Vehicle meets charge condition, wherein first threshold is more than second threshold；And/or
The piconet controller, is additionally operable to when being incorporated into the power networks, if judging the power generator according to the monitoring information
Generated output reaches third threshold value, and the remaining capacity of the electric vehicle is less than the charging of second threshold or the electric vehicle
When priority is higher than preset value, it is determined that the electric vehicle meets charge condition；And/or
The piconet controller is additionally operable to judging to be currently at isolated power grid, and the remaining capacity of the electric vehicle is big
When first threshold, determine that the electric vehicle meets discharging condition.
4. according to claim 1-3 any one of them direct current micro-grid systems, which is characterized in that the Bidirectional charging-discharging device packet
Include direct current rifle, two-way DC/DC modules and power distribution module, wherein described in the first port connection of the two-way DC/DC modules
The second port of DC bus, the two-way DC/DC modules connects the first port of the power distribution module, the power point
Second port with module is connected by the direct current rifle with the electric vehicle；Moreover,
The power distribution module, for receiving the charge/discharge instruction that the piconet controller issues, and with the electronic vapour
When the BMS modules of vehicle successfully carry out handshake communication, the operating mode and running parameter of the two-way DC/DC modules are configured, wherein
The operating mode includes charge mode, discharge mode, and the running parameter includes current value, voltage value.
5. direct current micro-grid system according to claim 4, which is characterized in that
The power distribution module is additionally operable to after receiving the charge/discharge instruction that the piconet controller issues, carries out certainly
Inspection judges whether the BMS modules with the electric vehicle successfully carry out handshake communication if self-test passes through, and in success, matches
Set the operating mode and running parameter of the two-way DC/DC modules.
6. direct current micro-grid system according to claim 4, which is characterized in that the power distribution module includes derailing switch
Part, the switching device are connected between the second port and the direct current rifle of the two-way DC/DC modules, moreover,
The power distribution module is additionally operable in the charge/discharge END instruction for receiving the piconet controller and issuing, alternatively,
When judging that itself or the two-way DC/DC modules are broken down, halt instruction is sent to the two-way DC/DC modules, and
The switching device is turned off, and sends charge/discharge to the BMS modules of the electric vehicle and stops information.
7. direct current micro-grid system according to claim 6, which is characterized in that
The power distribution module is additionally operable to the suspension sent in the BMS modules for receiving the electric vehicle or end mark
When, halt instruction is sent to the two-way DC/DC modules, and turn off the switching device.
8. direct current micro-grid system according to claim 4, which is characterized in that
The quantity of the two-way DC/DC modules is multiple, and the quantity of the power distribution module is one, moreover, each described
The first port of two-way DC/DC modules is separately connected the DC bus, the second port point of each two-way DC/DC modules
The first port of the power distribution module is not connected, and the third port of the power distribution module connects the microgrid control
Device.
9. direct current micro-grid system according to claim 4, which is characterized in that
The quantity of the two-way DC/DC modules is identical with the quantity of the power distribution module and respectively multiple, one of them
Power distribution module is main power distribution module, and other power distribution modules are from power distribution module, wherein each described
The first port of two-way DC/DC modules respectively connects the DC bus, the second port of each two-way DC/DC modules
The first port of corresponding power distribution module is connected, moreover, described in the third port connection of the main power distribution module
4th port of piconet controller, the main power distribution module is separately connected the third port from power distribution module.
10. a kind of charge/discharge control method of the electric vehicle of the direct current micro-grid system of application in claim 1, feature exist
In including the following steps：
Bidirectional charging-discharging device, power generator and load device are monitored in real time, to obtain monitoring information；
When judging that the Bidirectional charging-discharging device accesses electric vehicle, the electricity is obtained by the Bidirectional charging-discharging device
The remaining capacity information of electrical automobile；
Whether judge the electric vehicle according to the remaining capacity information, the monitoring information and preset peak load shifting strategy
Meet charge/discharge condition；
If meeting charge condition, controls the Bidirectional charging-discharging device and charge for the electric vehicle；
If meeting discharging condition, controls the electric vehicle and discharge to the Bidirectional charging-discharging device.
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