CN102684313B - Coordination control method of large-scale energy storage device - Google Patents
Coordination control method of large-scale energy storage device Download PDFInfo
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Abstract
The invention relates to a coordination control method of a large-scale energy storage device. A coordination controller is used for controlling the startup and the shutdown of bottom layer control units; the bottom layer control units are used for feeding back the fault and a running state to the coordination controller; the coordination controller is used for monitoring the state of a bottom layer module and the allowable maximum charging/discharging power of a storage battery; a power control unit is used for distributing the power rating to each bottom layer control unit according to the proportional distribution; in the off-grid operation, a power balance control manner capable of avoiding the circulation of an inverter is adopted; and the balance of the storage battery is performed in an automatic balancing manner in a system shutdown or standby state. The coordination control method has the benefits that the difficult problem of multi-objective coordination control of the large-scale energy storage device is solved, a basis is laid for the research and development, and the popularization of the large-scale energy storage device, and the theoretical significance and the engineering practical significance are very important.
Description
Technical field
The present invention relates to coordination control method of large-scale energy storage device.
Background technology
Large-scale energy storage device is in the demonstrating running stage at home and abroad at present, not yet large-scale promotion, the demonstration project that put into operation great majority are the exemplary energy storage device of low capacity, and mostly adopt one-stage transfor-mation, from in network operation applied environment, major part is all unit operation.
Current method Problems existing and shortcoming: due to the development at home and abroad of energy storage device being in the starting stage.Domesticly at present there is no the large-scale energy storage device coordination control strategy being applicable to energy storage device.
Application number be 201110231953.5 Chinese patent application " a kind of large-scale energy storage device and main circuit thereof " provide a kind of main circuit topology and parametric controller scheme of large-scale energy storage device.Perfect further to its coordination control strategy on the basis of the program of the present invention.
Summary of the invention
The object of this invention is to provide a kind of coordination control method of large-scale energy storage device, be not suitable for the problem of large-scale energy storage device in order to solve existing control strategy.
For achieving the above object, the solution of the present invention is: a kind of coordination control method of large-scale energy storage device, and tuning controller controls startup and the shutdown of bottom control unit, and bottom control unit is to tuning controller feedback fault and running status; Tuning controller monitoring bottom module status and storage battery allow maximumly to fill/put power, and power control unit issues power definite value with pro-rata to each bottom control unit; From in network operation, adopt the Power balance control mode avoiding inverter loop current; The mode of automatic equalization under system-down or holding state is adopted to carry out the equilibrium of storage battery.
Tuning controller controls bottom control unit and passes through optical-fibre communications.
In the Power balance control of described each inverter, add a time delay for detection system active power of output and reactive power.
Described time delay is 20ms.
The invention solves a multi-objective coordinated control difficult problem for large-scale energy storage device, for the development of large-scale energy storage device and popularization lay the foundation, there is extremely important theory significance and engineering realistic meaning.
Advantage of the present invention:
Tuning controller utilizes optical interface level to change to come the startup of control module unit, shutdown, reset and fault protection logic, ensure that the reliable and stable operation of device;
Allow maximumly to fill/put power by tuning controller monitoring bottom module status and storage battery in this strategy, complete issuing each module definite value by power control unit.Solve power division inequality and cause the problem that system power utilance is low;
Solve the circulation problem from network operation multi-machine parallel connection.
This control strategy, when storage battery is demarcated and be balanced, only need operate single Battery pack, not affect the normal work of device.
The main difference of the present invention and current method: 1) large code energy storage device needs the cooperation control to multiple bottom module, and complexity is higher, cooperation control difficulty is comparatively large, and electromagnetic interference under running environment is more violent.2) circulation problem from the parallel connection of network operation energy storage device is solved, for the development of large-scale energy storage device and popularization are laid a good foundation.
Accompanying drawing explanation
Fig. 1 is the startup Control protection logical schematic of large-scale energy storage device;
Fig. 2 is communication network schematic diagram;
Fig. 3 is pro-rata power flow figure;
Fig. 4 is energy storage device Parallel Control block diagram;
Fig. 5 is Balance route flow chart.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
This control strategy starts the realization of energy storage device under being and realizing different operating mode, shut down, reseting logic operation, fault protection logic operation, power division, energy storage battery demarcated and Balance route, from network operation energy storage device Parallel Control.
The coordination control strategy of large-scale energy storage device is described in detail as follows:
1, each module starts control, relay protective scheme
The startup Control protection logical schematic of large-scale energy storage device as shown in Figure 1, bottom control unit is equal to the controller of each current transformer in the accompanying drawing of patent document 201110231953.5 described in background technology.Tuning controller and lower floor control respectively by two Fiber connection, and one is fault feedback signal for starting control signal, another root.
Start control signal and be divided into three kinds of situations: A, 1Mhz square-wave signal: tuning controller issues the reset signal of bottom, completes and reset to bottom module failure; B, has light signal: high level signal, the starting command that tuning controller issues.Complete and the startup of bottom module is controlled; C, without light signal: low level signal, the halt command that tuning controller issues, completes the shutdown operation to bottom module.Fault and running status feedback signal are divided into two kinds of situation: A, have light signal: bottom module is in cold standby state; B, without light signal: bottom module is in malfunction; C, 1Mhz square-wave signal: bottom module is in running status.
Bottom control is carried out each module by the change of startup control optical fiber level and is operated accordingly, and cooperation control unit is controlled corresponding bottom floor units by fault and the change of running status feedback signal simultaneously.Owing to being the device misoperation that Fiber connection can avoid because electromagnetic interference causes, the reliable and stable operation of assurance device.
2, power division
As shown in Figure 2, bottom control unit and cooperation control unit form CAN pattern.Receive higher level by cooperation control unit and monitor the power instruction issued, obtained the definite value of each module by power distributing unit, be then issued to bottom control unit through CAN, control corresponding module and run.
Power division is generally divided into mean allocation, pro-rata and according to priority distributes.Power given divided by battery pack number (not considering the otherness of battery pack), is obtained the performance number that every Battery pack should export by mean allocation; Pro-rata considers the otherness of battery pack, large multiple of available horsepower, and little few sends out available horsepower; According to priority distributing is exactly to each battery pack determination priority, when power given is less than the highest battery pack of priority, and only startup the first Battery pack, if be greater than the highest module of priority, the module Operation at full power that priority is the highest, by that analogy.Pro-rata can improve the utilance of system, can improve the useful life of battery during heavy duty.
In practical application, the useful life of response time and battery is the most important two indices weighing energy-storage system quality, therefore considers and adopts the second power allocation scheme (pro-rata).The flow process of pro-rata is as Fig. 3.The required physical quantity of pro-rata is as following table.
Required physical quantity pro rata distributed by table 1
| Name variable | Data name |
| PowerGiven | Power given |
| ChPowerSum | Available charge power sum |
| DisChPowerSum | Available discharge power sum |
| ChPowerEn[k] | Kth Battery pack can use charge power |
| DisChPowerEn[k] | Kth Battery pack available discharge power |
| ChPower[k] | Kth Battery pack charge power |
| DisChPower[k] | Kth Battery pack discharge power |
3, from the sharing control of network operation energy storage device parallel connection
From in network operation, because each energy storage device exists deviation at output voltage amplitude and phase place, line impedance is also variant simultaneously.Therefore must have circulation during each inverter parallel, thus make each inversion module can not load-sharing, part of module may work in overload, and then causes the collapse of parallel system.So Parallel Control need be added when inverter parallel to suppress inverter loop current, ensure that each inverter load-sharing normally works.As shown in Figure 4, in figure, variable-definition is as follows for its control strategy:
Vcd is system voltage real component, Vcq is system voltage idle component, id is system power real component, iq is system power idle component, Pi is system active power, Qi is system reactive power, Pave is computing system active power set-point, Qave is the meritorious deviation of the idle set-point of computing system, Δ Vd energy storage device, and Δ Vq is the idle deviation of energy storage device, V*d is device active voltage set-point, V*q is device reactive voltage set-point, and idref is device active current set-point, and iqref is device reactive current set-point.
Identical with phase angle in order to ensure each inverter output voltage amplitude, Power balance control need be added between each inverter, ensure the power-sharing between each inverter, suppress system circulation.Power-sharing controls, and owing to needing detection system to export meritorious and reactive power, therefore add the time delay of a 20ms, current-sharing effect is better, and stability is high, has stronger disturbance rejection.
During inverter output average power, the output voltage of its correspondence is
and carry out dq decoupling zero with line voltage in parallel for benchmark, then have:
From above formula, when line impedance is pure perception, inverter output voltage d axle component difference causes idle unbalanced, and q axle difference causes meritorious output circulation.In order to realize the equilibrium of inverter output power, the outer PI adding power equalization can be controlled at contravarianter voltage and controlling, to suppress the circulation between inverter.
Each bottom module, due to the difference of hardware and software, causes each inverter output voltage amplitude, phase angle variant, therefore adopts power outer shroud to superpose correction in inverter output voltage instruction, thus regulates each inverter output voltage equal.
4, to demarcation and the Balance route of energy storage battery
Large-capacity battery pack used in energy-storage system is all undertaken by the monomer of low capacity that connection in series-parallel forms, although the connection in series-parallel of battery pack can improve the capacity of battery pack and withstand voltage, but along with the increase of battery series-parallel connection number, each monomer occurs that the possibility of difference is also along with increase, and the difference of monomer can affect capacity and the useful life of whole Battery pack.Although consistency when battery dispatches from the factory can be done well, along with the use of battery, monomer occurs that difference is inevitable, in order to the utilance in useful life and system of improving energy-storage system, carries out equilibrium be absolutely necessary to whole Battery pack.
The balanced unit general principle that the equilibrium of battery is used is substantially identical: the monomer low to voltage with small area analysis charges, and the monomer high to voltage discharges, to improve the consistency of monomer voltage.Have manually and automatic two kinds of modes the equilibrium of battery, time manually balanced, battery pack wants state out of service, clearly can reduce the utilance of system, also very inconvenient concerning manual equilibrium energy-storage system; Automatic equalization does not need the participation of people, is automatically completed by system, can improve the utilance of system.Manual equilibrium and automatic equalization are to such as table 2.Automatic equalization is also divided into various ways: balanced and unconditional balanced under stopped status.Under stopped status, equilibrium only under system-down state, just can carry out equilibrium, if system is run always, cannot carry out equilibrium; To be no matter what state device is in can carry out equilibrium in unconditional equilibrium.Balanced and unconditional balanced to such as table 3 under stopped status.
Table 2 manually balanced with automatically contrast
Balanced and unconditional balanced under table 3 stopped status
Utilance in energy-storage system is one of most important index, therefore adopts automatic equalization mode.And the automatic equalization mode that table 3 is mentioned all exists certain defect, adopt half-way house: during the parallel running of many Battery packs, select to carry out equilibrium as far as possible under system-down or holding state; If need equilibrium during discharge and recharge; then only equilibrium is carried out to a Battery pack; shut down needing balanced battery pack and run; other battery pack normally work; after one Battery pack equilibrium completes, the benefit of the equilibrium/do like this of other batteries of continuation does not affect portfolio effect, significantly can not reduce again the utilance (only reducing the power of a Battery pack) of system.Balanced flow process is as Fig. 5.
The battery equalisation mode mentioned in above embodiment, sharing control, power division mode etc. in parallel all belong to prior art, so do not do too much introduction.
Claims (4)
1. a coordination control method of large-scale energy storage device, is characterized in that, tuning controller controls startup and the shutdown of bottom control unit, and bottom control unit is to tuning controller feedback fault and running status; Tuning controller monitoring bottom module status and storage battery allow maximumly to fill/put power, and power control unit issues power definite value with pro-rata to each bottom control unit; From in network operation, when inverter parallel, between each inverter, add Power balance control, ensure the power-sharing between each inverter, suppress system circulation, adopt the Power balance control mode avoiding inverter loop current; The mode of automatic equalization under system-down or holding state is adopted to carry out the equilibrium of storage battery;
Described employing avoids the Power balance control mode of inverter loop current to be: V
cd, V
cq, i
qand i
dp is exported through power computation module
i, Q
i, P
iwith P
avevalue P relatively
ave-P
iΔ V is exported after pi regulator regulates
d, Q
iwith Q
avevalue Q relatively
ave-Q
iΔ V is exported after pi regulator regulates
q;
V
* dwith Δ V
dsuperpose rear and V
cdthe value V relatively obtained
* d+ Δ V
d-V
cdi is exported after pi regulator regulates
dref, i
drefwith i
dvalue i relatively
dref-i
dv is exported after pi regulator regulates
d; V
* qwith Δ V
qsuperpose rear and V
cqthe value V relatively obtained
* q+ Δ V
q-V
cqi is exported after pi regulator regulates
qref, i
qrefwith i
qvalue i relatively
qref-i
qv is exported after pi regulator regulates
q; By V
d, V
qand the result of phase angle θ after ad/abc conversion is as the input of inverter, finally obtains inverter output voltage;
Wherein, V
cdfor system voltage real component, V
cqfor system voltage idle component, i
dfor system power real component, i
qfor system power idle component, P
ifor system active power, Q
ifor system reactive power, P
avefor computing system active power set-point, Q
avefor the idle set-point of computing system, Δ V
dthe meritorious deviation of energy storage device, Δ V
qfor the idle deviation of energy storage device, V
* dfor device active voltage set-point, V
* qfor device reactive voltage set-point, i
dreffor device active current set-point, i
qreffor device reactive current set-point;
Identical with phase angle in order to ensure each inverter output voltage amplitude, Power balance control need be added between each inverter, ensure the power-sharing between each inverter, suppress system circulation; During inverter output average power, the output voltage of its correspondence is
and carry out dq decoupling zero with line voltage in parallel for benchmark, then have:
When line impedance is pure perception, inverter output voltage d axle component difference causes idle unbalanced, and q axle difference causes meritorious output circulation; In order to realize the equilibrium of inverter output power, the outer PI adding power equalization can be controlled at contravarianter voltage and controlling, to suppress the circulation between inverter.
2. a kind of coordination control method of large-scale energy storage device according to claim 1, is characterized in that, tuning controller controls bottom control unit and passes through optical-fibre communications.
3. a kind of coordination control method of large-scale energy storage device according to claim 1, is characterized in that, in the Power balance control of described each inverter, adds a time delay for detection system active power of output and reactive power.
4. a kind of coordination control method of large-scale energy storage device according to claim 3, is characterized in that, described time delay is 20ms.
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| CN104682414B (en) * | 2013-11-29 | 2017-08-22 | 比亚迪股份有限公司 | A kind of many transverters realize off-grid method from grid-connected |
| CN105140939B (en) * | 2015-08-10 | 2018-04-03 | 江苏方天电力技术有限公司 | The multi-objective coordinated control method of active load based on energy-storage system |
| CN111884243B (en) * | 2020-07-28 | 2022-04-08 | 阳光新能源开发股份有限公司 | Energy storage regulation and control method, energy storage system and computer storage medium |
| CN112848951A (en) * | 2020-12-06 | 2021-05-28 | 南京工业大学 | Off-grid type light storage, charging and power supply coordination control system and method |
| CN113193550A (en) * | 2021-04-10 | 2021-07-30 | 中国海洋石油集团有限公司 | Integrated energy storage system of offshore oil platform, battery unit and control method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5646504A (en) * | 1994-04-15 | 1997-07-08 | Feldstein; Robert S. | Magnetically balanced multi-output battery charging system |
| CN102122826A (en) * | 2011-01-17 | 2011-07-13 | 中国南方电网有限责任公司电网技术研究中心 | Energy storage bidirectional current converter for high-capacity storage battery |
| CN102290851A (en) * | 2011-08-15 | 2011-12-21 | 许继电源有限公司 | Large-scale energy storing device and main circuit thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1312820C (en) * | 2002-10-18 | 2007-04-25 | 艾默生网络能源有限公司 | Parallel single-phase DC-to-AC converter systems |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5646504A (en) * | 1994-04-15 | 1997-07-08 | Feldstein; Robert S. | Magnetically balanced multi-output battery charging system |
| CN102122826A (en) * | 2011-01-17 | 2011-07-13 | 中国南方电网有限责任公司电网技术研究中心 | Energy storage bidirectional current converter for high-capacity storage battery |
| CN102290851A (en) * | 2011-08-15 | 2011-12-21 | 许继电源有限公司 | Large-scale energy storing device and main circuit thereof |
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