CN106374517B - A kind of battery energy storage system control method for reducing photovoltaic plant abandoning light and rationing the power supply - Google Patents
A kind of battery energy storage system control method for reducing photovoltaic plant abandoning light and rationing the power supply Download PDFInfo
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- CN106374517B CN106374517B CN201611003881.8A CN201611003881A CN106374517B CN 106374517 B CN106374517 B CN 106374517B CN 201611003881 A CN201611003881 A CN 201611003881A CN 106374517 B CN106374517 B CN 106374517B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 151
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000010248 power generation Methods 0.000 claims abstract description 11
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- 239000011159 matrix material Substances 0.000 claims description 28
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- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims description 10
- 210000004027 cell Anatomy 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 210000000352 storage cell Anatomy 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 4
- 238000011156 evaluation Methods 0.000 claims description 4
- 238000000513 principal component analysis Methods 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 4
- 230000005611 electricity Effects 0.000 abstract description 8
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- 238000005516 engineering process Methods 0.000 abstract description 2
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- 238000013461 design Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 1
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- 239000007788 liquid Substances 0.000 description 1
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- 230000003287 optical effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H02J3/383—
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
Abstract
The present invention relates to a kind of reduction photovoltaic plants to abandon the battery energy storage system control method that light is rationed the power supply.Battery energy storage system includes: the N number of light storage connecting with power grid and net unit, abandoning photocontrol module, the charge-discharge electric power distribution module of battery energy storage system, box step-up transformer corresponding to each light storage and net unit；Simultaneously net unit includes: photovoltaic generation unit, battery energy storage unit for each light storage, and each photovoltaic generation unit is connected to three phase network low-pressure side PCC grid entry point, and corresponding battery energy storage unit is connected to three phase network low-pressure side PCC grid entry point；The progress of the present invention compared with the existing technology is: reducing the construction cost of primary substation in light electricity storage station, improves the economy of photovoltaic power generation.
Description
Technical field:
The present invention relates to the power supply systems of photovoltaic plant, and in particular to a kind of battery storage for reducing photovoltaic plant abandoning light and rationing the power supply
It can system control method.
Background technique:
Currently, photovoltaic power generation is widely accepted as renewable energy, meanwhile, photovoltaic power generation fast development is power grid
Bring challenge is run, it is current to pass through the sides such as construction auxiliary facility, reinforcement grid structure, construction peak load stations and water power bundling
Formula enhances power grid to the receiving ability of photovoltaic power generation.To a certain extent by various restrictions, power grid needs flexible the above means
Efficient means realize the submitting and consumption of photovoltaic power generation.Large-scale energy-storage system provides the scheduling of flexibility and reliability for power grid
Resource can improve the intermittence and uncertain characteristic of photovoltaic power generation, improve peak load regulation network fm capacity, realize operation of power networks
Safe and stable and economical operation.
Currently, light stores up in the design in grid-connected power station, battery energy storage system unit as a whole by two-way inverter and is built
If individual boosting change access high voltage AC bus, realization photovoltaic and energy-storage system is grid-connected.Primary substation in light electricity storage station
Higher cost, seriously affected the economy of photovoltaic power generation, needed to design new light storage grid-connect mode.
Summary of the invention:
The present invention proposes a kind of light storage grid integration mode, the cheaper photovoltaic plant battery energy storage system of design cost
System control method.Concrete scheme is as follows:
A kind of battery energy storage system for reducing photovoltaic plant abandoning light and rationing the power supply, comprising: the N number of light connecting with power grid stores up grid-connected list
Member, abandon photocontrol module, battery energy storage system battery energy storage system charge-discharge electric power distribution module, each light stores up grid-connected list
Box step-up transformer corresponding to member；The each light storage and net unit include: photovoltaic generation unit, battery energy storage unit,
Each photovoltaic generation unit successively passes through DC/AC inverter, DC/DC converter is connected to three phase network low-pressure side PCC grid entry point,
Corresponding battery energy storage unit is connected to three phase network low-pressure side PCC grid entry point by DC/AC inverter；N number of light storage is simultaneously
Net unit is independent of one another, accesses High-voltage AC Network by corresponding step-up transformer.
In the present invention, battery energy storage system refers to the general name of all battery energy storage units；Photovoltaic generating system refers to all
The general name of photovoltaic generation unit.
Preferably, further includes: on-scene communication supervisor, remote terminal control module, the on-scene communication management
Machine is with light storage and net unit, abandoning photocontrol module, the charge-discharge electric power distribution module of battery energy storage system connect, and pass through interconnection
Net is connect with remote terminal control module, realizes remote control.
A kind of reduction photovoltaic plant realized in above system abandons the battery energy storage system control method that light is rationed the power supply, including
Following steps:
Step 1: system operation judges whether battery energy storage system meets service condition, meets and go to step 2, otherwise to be shipped
Row；
Step 2: detecting current photovoltaic plant overall output power PPV, grid-connected power P is limited with current photovoltaic plantLThan
Compared with judging whether to meet PPV≥PL, meet, go to step 3, otherwise go to step 7；PPVRepresent photovoltaic plant integrally instantaneous output work
Rate, PLIt represents photovoltaic plant and limits grid-connected power；
Step 3: the real-time SOC value of detection photovoltaic plant system stored energy system, judge whether to meet charge condition SOC <
SOCMax, it is to go to step 4, otherwise goes to step 12；SOC be battery energy storage system remaining capacity state, value range be 0~
1, it indicates that battery discharge is complete as SOC=0, indicates that battery is completely filled with as SOC=1；SOCMaxTo be able to satisfy battery energy storage
Lotus state of charge when the maximum battery capacity of system charge condition；
Step 4: computing redundancy power PPV_B=PPV- PL, judge whether redundant power meets PPV_B<PB_R, meet, turn step
Rapid 5, otherwise go to step 6；PB_RFor the sum of the rated power of battery energy storage system；
Step 5: electric power station system P to be outputB=PPV- PLPerformance number through battery energy storage system charge-discharge electric power distribute
Module issues each energy-storage units power instruction；PBThe performance number to charge for photovoltaic generating system to battery energy storage system；Then
Return step 1；
Step 6: the charge-discharge electric power distribution module of battery energy storage system is by PB=PB_RPower instruction be assigned to each electricity
Pond energy-storage units；PBThe performance number to charge for photovoltaic generating system to battery energy storage system；Then return step 1；
Step 7: the real-time SOC value of detection photovoltaic plant battery energy storage system, judge whether to meet discharging condition SOC >
SOCMin, it is to go to step 8, otherwise goes to step 11；SOCMinHold to be able to satisfy the minimum battery of battery energy storage system discharging condition
Lotus state of charge when amount；
Step 8: calculating notch power PPV_O=PL- PPV, judge whether to meet PPV_O<PB_R, meet, go to step 9, otherwise
Go to step 10；PB_RFor the rated power of present battery energy-storage system；
Step 9: discharge energy-storage control unit is by PO=PL- PPVPerformance number be allocated and be issued to each battery energy storage
Unit, each energy-storage units electric discharge；POFor the performance number of battery energy storage system electric discharge；Then return step 1；
Step 10: discharge energy-storage control unit is by PO=PB_RPerformance number be allocated and be issued to each battery energy storage list
Member.Each energy-storage units electric discharge；Then return step 1；
Step 11: photovoltaic plant normal power generation, battery energy storage system enter hot stand-by duty；Then return step 1；
Step 12: photovoltaic plant abandons light, then return step 1.
The progress of the present invention compared with the existing technology is:
(1) battery energy storage unit and photovoltaic generation unit share box step-up transformer, and the two is connected in parallel on three-phase alternating current
Net low-pressure side forms basic cutting-in control unit, reduces the construction cost of primary substation in light electricity storage station, improves photovoltaic hair
The economy of electricity；
(2) in control method in embodiment, abandoning photocontrol strategy is different from conventional light electricity storage station control, especially
In a preferred approach, principal component analytical method is introduced, the power point when each battery energy storage system energy storage, electric discharge is optimized
Match, each battery energy storage unit is made to keep in balance as far as possible, can make the running and comparing of each energy-storage units balanced in this way, the service life tends to
Consistency, the operation and maintenance and equipment for being conducive to photovoltaic plant update.
Detailed description of the invention:
Fig. 1 is the composed structure schematic diagram of system in embodiment.
Fig. 2 is the logic diagram of control method of the present invention；In figure, PQIt represents photovoltaic plant and abandons optical power, PPV_outRepresent light
The power that overhead utility is fed to power grid.
Fig. 3 is the specific implementation process logic diagram of control method step 5 of the present invention.
Fig. 4 is the specific implementation process logic diagram of control method step 9 of the present invention.
Specific embodiment:
Embodiment:
In conjunction with Fig. 1-4, illustrate implementation process of the invention.
A kind of battery energy storage system for reducing photovoltaic plant abandoning light and rationing the power supply, comprising: the N number of light connecting with power grid stores up grid-connected list
Member abandons photocontrol module, the charge-discharge electric power distribution module of battery energy storage system, and each light stores up box corresponding to simultaneously net unit
Step-up transformer, on-scene communication supervisor, remote terminal control module；Simultaneously net unit includes: photovoltaic power generation for each light storage
Unit, battery energy storage unit, each photovoltaic generation unit successively passes through DC/AC inverter, DC/DC converter is connected to three-phase electricity
Net low-pressure side PCC grid entry point, corresponding battery energy storage unit are connected to three phase network low-pressure side PCC simultaneously by DC/AC inverter
Site；Simultaneously net unit is independent of one another for N number of light storage, passes through corresponding step-up transformer and accesses 35kV High-voltage AC Network；Institute
State on-scene communication supervisor and light storage and net unit, abandoning photocontrol module, the charge-discharge electric power distribution module of battery energy storage system
Connection, and connect by internet with remote terminal control module, realize remote control.The battery energy storage unit takes liquid stream
Battery energy storage system, power 500kW, capacity 1500kWh；The power of photovoltaic generation unit is 1MW；Photovoltaic generation unit
The box step-up transformer of 1000kVA is shared with battery energy storage system, the two is connected in parallel on three-phase AC grid low-pressure side, and composition is basic
Cutting-in control unit.
The control method realized in above system, includes the following steps:
Step 1: system operation judges whether battery energy storage system meets service condition, meets and go to step 2, otherwise to be shipped
Row；
Step 2: detecting current photovoltaic plant overall output power PPV, grid-connected power P is limited with current photovoltaic plantLThan
Compared with judging whether to meet PPV≥PL, meet, go to step 3, otherwise go to step 7；PPVRepresent photovoltaic plant integrally instantaneous output work
Rate, PLIt represents photovoltaic plant and limits grid-connected power；
Step 3: the real-time SOC value of detection photovoltaic plant system stored energy system, judge whether to meet charge condition SOC <
SOCMax, it is to go to step 4, otherwise goes to step 12；SOC be battery energy storage system remaining capacity state, value range be 0~
1, it indicates that battery discharge is complete as SOC=0, indicates that battery is completely filled with as SOC=1；SOCMaxTo be able to satisfy battery energy storage
Lotus state of charge when the maximum battery capacity of system charge condition；
Step 4: computing redundancy power PPV_B=PPV- PL, judge whether redundant power meets PPV_B<PB_R, meet, turn step
Rapid 5, otherwise go to step 6；PB_RFor the sum of the rated power of battery energy storage system；
Step 5: the charge-discharge electric power distribution module of battery energy storage system is by PB=PPV- PLPerformance number distribution, and issue
It charges to each battery energy storage unit；PBIt is photovoltaic generation unit to the charge power value of pond energy-storage system；Detailed process
It is as follows:
Step 5.1: detecting the lotus state of charge SOC of each battery energy storage unitiIt is whether at equilibrium, it is to go to step
5.2, otherwise go to step 5.3；
Step 5.2: the charge power value progress of battery energy storage system is linear respectively, and it is issued to each energy-storage units；So
After go to step 1；
Step 5.3: with the SOC of each battery energy storage uniti, voltage, electric current, charge cutoff SOCMax, electric discharge cut-off SOCMin、
The output power of photovoltaic cells is parameter in corresponding and net unit, carries out principal component analysis, specifically:
Step 5.3.1: with the SOC of each battery energy storage uniti, voltage, electric current, charge cutoff SOCMaxi, electric discharge cut-off
SOCMini, the output power of photovoltaic cells is parameter in corresponding and net unit；
Step 5.3.2: building sample matrix
For N number of battery energy storage unit, B is usedijIndicate the grid-connected index of jth item of battery energy storage unit i, wherein i=1,2,
3 ... N, j=1,2,3,4,5；
Step 5.3.3: converting sample matrix X, so that Y=[yij]n×p；
Step 5.3.4: standardized transformation is done to Y and obtains normalized matrix:
Wherein,The mean value and standard deviation that jth arranges in respectively Y gusts；
Step 5.3.5: the correlation matrix of normalized matrix Z:
Step 5.3.6: characteristic value is sought: | R- λ IP|=0, solve P eigenvalue λ1≥λ1≥λ1……λP≥0；
Step 5.3.7: m value, method are determined are as follows:
To each λj, j=1,2 ... ... m, solving equations Rb=λjB, so that phasor
Step 5.3.8: z is found outj=(zi1,zi1,........ziP)TM principal component component, obtain decision matrix；
Step 5.3.9: weight model is established
In formula, F1, F2... ... FmThe m main compositions obtained after respectively analyzing, uijFor decision matrix coefficient；
Step 5.3.10: building composite evaluation function obtains the weight of each battery energy storage unit charge-discharge electric power:
κ=λ1+λ2……λm
Step 5.3.11: the weight coefficient of each battery energy storage unit energy storage power is obtained are as follows:
Step 5.3.12: each battery energy storage unit energy storage performance number P is determinedBi:
PBi=PBωi, (i=1,2 ... N),
Then, return step 1；
Step 6: the charge-discharge electric power distribution module of battery energy storage system is by PB=PB_RPower instruction be assigned to each electricity
Pond energy-storage units；PBThe performance number to charge for photovoltaic generating system to battery energy storage system；Then return step 1；
Step 7: the real-time SOC value of detection photovoltaic plant battery energy storage system, judge whether to meet discharging condition SOC >
SOCMin, it is to go to step 8, otherwise goes to step 11；SOCMinHold to be able to satisfy the minimum battery of battery energy storage system discharging condition
Lotus state of charge when amount；
Step 8: calculating notch power PPV_O=PL- PPV, judge whether to meet PPV_O<PB_R, meet, go to step 9, otherwise
Go to step 10；PB_RFor the rated power of present battery energy-storage system；
Step 9: discharge energy-storage control unit is by PO=PL- PPVPerformance number be allocated and be issued to each battery energy storage
Unit, each energy-storage units electric discharge；POFor the performance number of battery energy storage system electric discharge；Detailed process is as follows:
Step 9.1: detecting the lotus state of charge SOC of each battery energy storage unitiIt is whether at equilibrium, it is to go to step
9.2, otherwise go to step 9.3；
Step 9.2: the progress of battery energy storage system discharge power value is linear respectively, and it is issued to each energy storage sub-unit；So
After go to step 1；
Step 9.3: with the SOC of each battery energy storage uniti, voltage, electric current, charge cutoff SOCMax, electric discharge cut-off SOCMin、
The output power of photovoltaic cells is parameter in corresponding and net unit, carries out principal component analysis, specifically:
Step 9.3.1: with the SOC of each battery energy storage uniti, voltage, electric current, charge cutoff SOCMax, electric discharge cut-off
SOCMin, the output power of photovoltaic cells is parameter in corresponding and net unit；
Step 9.3.2: building sample matrix
For N number of battery energy storage unit, B is usedijIndicate the grid-connected index of jth item of battery energy storage unit i, wherein i=1,2,
3 ... N, j=1,2,3,4,5；
Step 9.3.3: converting sample matrix X, so that Y=[yij]n×p；
Step 9.3.4: standardized transformation is done to Y and obtains normalized matrix:
Wherein,The mean value and standard deviation that jth arranges in respectively Y gusts；
Step 9.3.5: the correlation matrix of normalized matrix Z:
Step 9.3.6: characteristic value is sought: | R- λ IP|=0, solve P eigenvalue λ1≥λ1≥λ1……λP≥0；
Step 9.3.7: m value, method are determined are as follows:
To each λj, j=1,2 ... ... m, solving equations Rb=λjB, so that phasor
Step 9.3.8: z is found outj=(zi1,zi1,........ziP)TM principal component component, obtain decision matrix；
Step 9.3.9: weight model is established
In formula, F1, F2... ... FmThe m main compositions obtained after respectively analyzing, uijFor decision matrix coefficient；
Step 9.3.10: building composite evaluation function obtains the weight of each battery energy storage cell discharge power:
κ=λ1+λ2……λm
Step 9.3.11: the weight of each battery energy storage cell discharge power is obtained are as follows:
Step 9.3.12: each battery energy storage cell discharge performance number P is determinedOi:
PO_i=POωi, (i=1,2 ... N),
Then, return step 1；
Step 10: discharge energy-storage control unit is by PO=PB_RPerformance number be allocated and be issued to each battery energy storage list
Member.Each energy-storage units electric discharge；Then return step 1；
Step 11: photovoltaic plant normal power generation, battery energy storage system enter hot stand-by duty；Then return step 1；
Step 12: photovoltaic plant abandons light, then return step 1.
Claims (5)
1. a kind of photovoltaic plant that reduces abandons the battery energy storage system control method that light is rationed the power supply,
The battery energy storage system includes: the N number of light storage connecting with power grid and net unit, abandoning photocontrol module, battery energy storage system
The charge-discharge electric power distribution module of system, each light store up box step-up transformer corresponding to simultaneously net unit；Each light storage is simultaneously
Net unit includes: photovoltaic generation unit, battery energy storage unit, and each photovoltaic generation unit successively passes through DC/AC inverter, DC/
DC converter is connected to three phase network low-pressure side PCC grid entry point, and corresponding battery energy storage unit is connected to by DC/AC inverter
Three phase network low-pressure side PCC grid entry point；Simultaneously net unit is independent of one another for N number of light storage, passes through corresponding box step-up transformer
Access High-voltage AC Network；
It is characterized by comprising the following steps:
Step 1: system operation judges whether battery energy storage system meets service condition, meets and go to step 2, otherwise wait run；
Step 2: detecting current photovoltaic plant overall output power PPV, grid-connected power P is limited with current photovoltaic plantLCompare, sentences
It is disconnected whether to meet PPV≥PL, meet, go to step 3, otherwise go to step 7；PPVRepresent photovoltaic plant entirety instantaneous output power, PLGeneration
Mass color overhead utility limits grid-connected power；
Step 3: the real-time SOC value of detection photovoltaic plant system stored energy system judges whether to meet charge condition SOC < SOCMax,
It is to go to step 4, otherwise goes to step 12；SOC is the remaining capacity state of battery energy storage system, and value range is 0~1, works as SOC
It indicates that battery discharge is complete when=0, indicates that battery is completely filled with as SOC=1；SOCMaxIt is filled to be able to satisfy battery energy storage system
Lotus state of charge when the maximum battery capacity of electric condition；
Step 4: computing redundancy power PPV_B=PPV- PL, judge whether redundant power meets PPV_B<PB_R, meet, go to step 5,
Otherwise 6 are gone to step；PB_RFor the rated power of battery energy storage system；
Step 5: electric power station system P to be outputB=PPV- PLPerformance number through battery energy storage system charge-discharge electric power distribution module will
Each energy-storage units power instruction issues；PBThe performance number to charge for photovoltaic generating system to battery energy storage system；Then step is returned
Rapid 1；
Step 6: the charge-discharge electric power distribution module of battery energy storage system is by PB=PB_RPower instruction be assigned to the storage of each battery
It can unit；PBThe performance number to charge for photovoltaic generating system to battery energy storage system；Then return step 1；
Step 7: the real-time SOC value of detection photovoltaic plant battery energy storage system judges whether to meet discharging condition SOC > SOCMin,
It is to go to step 8, otherwise goes to step 11；SOCMinWhen minimum battery capacity to be able to satisfy battery energy storage system discharging condition
Lotus state of charge；
Step 8: calculating notch power PPV_O=PL- PPV, judge whether to meet PPV_O<PB_R, meet, go to step 9, otherwise turn to walk
Rapid 10；PB_RFor the rated power of present battery energy-storage system；
Step 9: discharge energy-storage control unit is by PO=PL- PPVPerformance number be allocated and be issued to each battery energy storage unit,
Each energy-storage units electric discharge；POFor the performance number of battery energy storage system electric discharge；Then return step 1；
Step 10: discharge energy-storage control unit is by PO=PB_RPerformance number be allocated and be issued to each battery energy storage unit, respectively
Energy-storage units electric discharge；Then return step 1；
Step 11: photovoltaic plant normal power generation, battery energy storage system enter hot stand-by duty；Then return step 1；
Step 12: photovoltaic plant abandons light, then return step 1.
2. a kind of photovoltaic plant that reduces abandons the battery energy storage system control method that light is rationed the power supply, feature according to claim 1
It is, detailed process is as follows for the step 5:
Step 5.1: detecting the lotus state of charge SOC of each battery energy storage unitiIt is whether at equilibrium, it is to go to step 5.2, it is no
Then go to step 5.3；
Step 5.2: the charge power value progress of battery energy storage system is linear respectively, and it is issued to each energy-storage units；Then turn
Step 1；
Step 5.3: with the SOC of each battery energy storage uniti, voltage, electric current, charge cutoff SOCMax, electric discharge cut-off SOCMin, it is corresponding
And the output power of photovoltaic cells is parameter in net unit, carries out principal component analysis, determines the energy storage function of each battery energy storage unit
Rate.
3. a kind of photovoltaic plant that reduces abandons the battery energy storage system control method that light is rationed the power supply, feature according to claim 2
It is, the step 5.3 specifically:
Step 5.3.1: with the SOC of each battery energy storage uniti, voltage, electric current, charge cutoff SOCMaxi, electric discharge cut-off SOCMini、
The output power of photovoltaic cells is parameter in corresponding and net unit；
Step 5.3.2: building sample matrix
For N number of battery energy storage unit, B is usedijIndicate the grid-connected index of jth item of battery energy storage unit i, wherein i=1,2,3 ...
N, j=1,2,3,4,5；
Step 5.3.3: converting sample matrix X, so that Y=[yij]n×p；
Step 5.3.4: standardized transformation is done to Y and obtains normalized matrix:
Wherein, The mean value and standard deviation that jth arranges in respectively Y gusts；
Step 5.3.5: the correlation matrix of normalized matrix Z:
Step 5.3.6: characteristic value is sought: | R- λ IP|=0, solve P eigenvalue λ1≥λ1≥λ1……λP≥0；
Step 5.3.7: m value, method are determined are as follows:
To each λj, j=1,2 ... ... m, solving equations Rb=λjB, so that phasor
Step 5.3.8: z is found outj=(zi1,zi1,........ziP)TM principal component component, obtain decision matrix；
Step 5.3.9: weight model is established
In formula, F1, F2... ... FmThe m main compositions obtained after respectively analyzing, uijFor decision matrix coefficient；
Step 5.3.10: building composite evaluation function obtains the weight of each battery energy storage unit charge-discharge electric power:
κ=λ1+λ2……λm
Step 5.3.11: the weight coefficient of each battery energy storage unit energy storage power is obtained are as follows:
Step 5.3.12: each battery energy storage unit energy storage performance number P is determinedBi:
PBi=PBωi, (i=1,2 ... N),
Then, return step 1.
4. a kind of photovoltaic plant that reduces abandons the battery energy storage system control method that light is rationed the power supply, feature according to claim 1
It is, detailed process is as follows for the step 9:
Step 9.1: detecting the lotus state of charge SOC of each battery energy storage unitiIt is whether at equilibrium, it is to go to step 9.2, it is no
Then go to step 9.3；
Step 9.2: the progress of battery energy storage system discharge power value is linear respectively, and it is issued to each energy storage sub-unit；Then turn
Step 1；
Step 9.3: with the SOC of each battery energy storage uniti, voltage, electric current, charge cutoff SOCMax, electric discharge cut-off SOCMin, it is corresponding
And the output power of photovoltaic cells is parameter in net unit, carries out principal component analysis, determines the electric discharge function of each battery energy storage unit
Rate.
5. a kind of photovoltaic plant that reduces abandons the battery energy storage system control method that light is rationed the power supply, feature according to claim 4
It is, the step 9.3 specifically:
Step 9.3.1: with the SOC of each battery energy storage uniti, voltage, electric current, charge cutoff SOCMax, electric discharge cut-off SOCMin, it is right
It answers and the output power of photovoltaic cells is parameter in net unit；
Step 9.3.2: building sample matrix
For N number of battery energy storage unit, B is usedijIndicate the grid-connected index of jth item of battery energy storage unit i, wherein i=1,2,3 ...
N, j=1,2,3,4,5；
Step 9.3.3: converting sample matrix X, so that Y=[yij]n×p；
Step 9.3.4: standardized transformation is done to Y and obtains normalized matrix:
Wherein, The mean value and standard deviation that jth arranges in respectively Y gusts；
Step 9.3.5: the correlation matrix of normalized matrix Z:
Step 9.3.6: characteristic value is sought: | R- λ IP|=0, solve P eigenvalue λ1≥λ1≥λ1……λP≥0；
Step 9.3.7: m value, method are determined are as follows:
To each λj, j=1,2 ... ... m, solving equations Rb=λjB, so that phasor
Step 9.3.8: z is found outj=(zi1,zi1,........ziP)TM principal component component, obtain decision matrix；
Step 9.3.9: weight model is established
In formula, F1, F2... ... FmThe m main compositions obtained after respectively analyzing, uijFor decision matrix coefficient；
Step 9.3.10: building composite evaluation function obtains the weight of each battery energy storage cell discharge power:
κ=λ1+λ2……λm
Step 9.3.11: the weight of each battery energy storage cell discharge power is obtained are as follows:
Step 9.3.12: each battery energy storage cell discharge performance number P is determinedOi:
PO_i=POωi, (i=1,2 ... N),
Then, return step 1.
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