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 P_{PV}, grid-connected power P is limited with current photovoltaic plant_{L}Than
Compared with judging whether to meet P_{PV}≥P_{L}, meet, go to step 3, otherwise go to step 7；P_{PV}Represent photovoltaic plant integrally instantaneous output work
Rate, P_{L}It 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 <
SOC_{Max}, 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；SOC_{Max}To 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 P_{PV_B}=P_{PV}- P_{L}, judge whether redundant power meets P_{PV_B}<P_{B_R}, meet, turn step
Rapid 5, otherwise go to step 6；P_{B_R}For the sum of the rated power of battery energy storage system；
Step 5: electric power station system P to be output_{B}=P_{PV}- P_{L}Performance number through battery energy storage system charge-discharge electric power distribute
Module issues each energy-storage units power instruction；P_{B}The 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 P_{B}=P_{B_R}Power instruction be assigned to each electricity
Pond energy-storage units；P_{B}The 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 >
SOC_{Min}, it is to go to step 8, otherwise goes to step 11；SOC_{Min}Hold 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 P_{PV_O}=P_{L}- P_{PV}, judge whether to meet P_{PV_O}<P_{B_R}, meet, go to step 9, otherwise
Go to step 10；P_{B_R}For the rated power of present battery energy-storage system；
Step 9: discharge energy-storage control unit is by P_{O}=P_{L}- P_{PV}Performance number be allocated and be issued to each battery energy storage
Unit, each energy-storage units electric discharge；P_{O}For the performance number of battery energy storage system electric discharge；Then return step 1；
Step 10: discharge energy-storage control unit is by P_{O}=P_{B_R}Performance 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.
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 P_{PV}, grid-connected power P is limited with current photovoltaic plant_{L}Than
Compared with judging whether to meet P_{PV}≥P_{L}, meet, go to step 3, otherwise go to step 7；P_{PV}Represent photovoltaic plant integrally instantaneous output work
Rate, P_{L}It 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 <
SOC_{Max}, 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；SOC_{Max}To 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 P_{PV_B}=P_{PV}- P_{L}, judge whether redundant power meets P_{PV_B}<P_{B_R}, meet, turn step
Rapid 5, otherwise go to step 6；P_{B_R}For 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 P_{B}=P_{PV}- P_{L}Performance number distribution, and issue
It charges to each battery energy storage unit；P_{B}It 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 unit_{i}It 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 unit_{i}, voltage, electric current, charge cutoff SOC_{Max}, electric discharge cut-off SOC_{Min}、
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 unit_{i}, voltage, electric current, charge cutoff SOC_{Maxi}, electric discharge cut-off
SOC_{Mini}, 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 used_{ij}Indicate 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=[y_{ij}]_{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 I_{P}|=0, solve P eigenvalue λ_{1}≥λ_{1}≥λ_{1}……λ_{P}≥0；
Step 5.3.7: m value, method are determined are as follows:
To each λ_{j}, j=1,2 ... ... m, solving equations Rb=λ_{j}B, so that phasor
Step 5.3.8: z is found out_{j}=(z_{i1},z_{i1},........z_{iP})^{T}M principal component component, obtain decision matrix；
Step 5.3.9: weight model is established
In formula, F_{1}, F_{2}... ... F_{m}The m main compositions obtained after respectively analyzing, u_{ij}For 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=λ_{1}+λ_{2}……λ_{m}
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 determined_{Bi}:
P_{Bi}=P_{B}ω_{i}, (i=1,2 ... N),
Then, return step 1；
Step 6: the charge-discharge electric power distribution module of battery energy storage system is by P_{B}=P_{B_R}Power instruction be assigned to each electricity
Pond energy-storage units；P_{B}The 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 >
SOC_{Min}, it is to go to step 8, otherwise goes to step 11；SOC_{Min}Hold 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 P_{PV_O}=P_{L}- P_{PV}, judge whether to meet P_{PV_O}<P_{B_R}, meet, go to step 9, otherwise
Go to step 10；P_{B_R}For the rated power of present battery energy-storage system；
Step 9: discharge energy-storage control unit is by P_{O}=P_{L}- P_{PV}Performance number be allocated and be issued to each battery energy storage
Unit, each energy-storage units electric discharge；P_{O}For 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 unit_{i}It 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 unit_{i}, voltage, electric current, charge cutoff SOC_{Max}, electric discharge cut-off SOC_{Min}、
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 unit_{i}, voltage, electric current, charge cutoff SOC_{Max}, electric discharge cut-off
SOC_{Min}, 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 used_{ij}Indicate 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=[y_{ij}]_{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 I_{P}|=0, solve P eigenvalue λ_{1}≥λ_{1}≥λ_{1}……λ_{P}≥0；
Step 9.3.7: m value, method are determined are as follows:
To each λ_{j}, j=1,2 ... ... m, solving equations Rb=λ_{j}B, so that phasor
Step 9.3.8: z is found out_{j}=(z_{i1},z_{i1},........z_{iP})^{T}M principal component component, obtain decision matrix；
Step 9.3.9: weight model is established
In formula, F_{1}, F_{2}... ... F_{m}The m main compositions obtained after respectively analyzing, u_{ij}For decision matrix coefficient；
Step 9.3.10: building composite evaluation function obtains the weight of each battery energy storage cell discharge power:
κ=λ_{1}+λ_{2}……λ_{m}
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 determined_{Oi}:
P_{O_i}=P_{O}ω_{i}, (i=1,2 ... N),
Then, return step 1；
Step 10: discharge energy-storage control unit is by P_{O}=P_{B_R}Performance 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.