CN102684313A - 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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- CN102684313A CN102684313A CN2012101665709A CN201210166570A CN102684313A CN 102684313 A CN102684313 A CN 102684313A CN 2012101665709 A CN2012101665709 A CN 2012101665709A CN 201210166570 A CN201210166570 A CN 201210166570A CN 102684313 A CN102684313 A CN 102684313A
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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 extensive energy storage device control method for coordinating.
Background technology
Extensive energy storage device is in the demonstration operation phase at present at home and abroad; Large-scale promotion not as yet, the demonstration project that put into operation great majority are the exemplary energy storage device of low capacity, and adopt the one-level conversion mostly; In the network operation applied environment, major part all is a unit operation.
The problem and the shortcoming of method existence at present: owing to be in the starting stage in the development at home and abroad of energy storage device.The present domestic extensive energy storage device coordination control strategy that is applicable to energy storage device that still do not have.
Application number is main circuit topology and the controlling platform scheme that 201110231953.5 one Chinese patent application " a kind of extensive energy storage device and main circuit thereof " provides a kind of extensive energy storage device.The present invention's further perfect to its coordination control strategy on the basis of this scheme.
Summary of the invention
The purpose of this invention is to provide a kind of extensive energy storage device control method for coordinating, in order to solve the problem that existing control strategy is not suitable for extensive energy storage device.
For realizing above-mentioned purpose, scheme of the present invention is: a kind of extensive energy storage device control method for coordinating, and the startup and the shutdown of tuning controller control bottom control unit, the bottom control unit is to tuning controller feedback fault and running status; Tuning controller monitoring bottom module status and storage battery allow maximum can fill/put power, and power control unit issues the power definite value with pro-rata to each bottom control unit; In network operation, adopt the power equalization control mode of avoiding inverter loop current; The mode that is employed in automatic equalization under system-down or the holding state is carried out the equilibrium of storage battery.
Tuning controller control bottom control unit is through optical-fibre communications.
In the power equalization control of said each inverter, add a time-delay that is used for detection system active power of output and reactive power.
Said time-delay is 20ms.
The invention solves the multi-objective coordinated control difficult problem of extensive energy storage device,, have extremely important theory significance and engineering realistic meaning for the development and the popularization of extensive energy storage device lays the foundation.
Advantage of the present invention:
The startup that tuning controller utilizes the optical interface level to change to come the control module unit, shut down, reset and the error protection logic, guaranteed the reliable and stable operation of device;
Allow maximum can fill/put power through tuning controller monitoring bottom module status and storage battery in this strategy, accomplish issuing each module definite value through power control unit.Solve the power division inequality and caused the low problem of system power utilance;
Solved circulation problem from the network operation multi-machine parallel connection.
When this control strategy is demarcated and be balanced at storage battery, only need single Battery pack is operated, do not influence the operate as normal of device.
The main difference of the present invention and present method: 1) big rules energy storage device need be to the coordination control of a plurality of bottom modules, and complexity is higher, and it is bigger to coordinate to control difficulty, and the electromagnetic interference under the running environment is more violent.2) solved from the parallelly connected circulation problem of network operation energy storage device, for the development and the popularization of extensive energy storage device are laid a good foundation.
Description of drawings
Fig. 1 is the start-up control protection logical schematic of extensive energy storage device;
Fig. 2 is the communication network sketch map;
Fig. 3 is a pro-rata power flow chart;
Fig. 4 is an energy storage device Parallel Control block diagram;
Fig. 5 is balanced control flow chart.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further detailed explanation.
This control strategy is the realization startup that realizes under the different operating modes energy storage device, shutdown, reseting logic operation, error protection logical operation, power division, energy storage battery is demarcated and balanced control, left network operation energy storage device Parallel Control.
The coordination control strategy of extensive energy storage device specifies as follows:
1, each module start-up control, protection logic
The start-up control of extensive energy storage device as shown in Figure 1 protection logical schematic, bottom control unit are equal to the controller of each current transformer in the accompanying drawing of patent document described in the background technology 201110231953.5.Tuning controller is controlled with lower floor and is connected through two optical fiber respectively, and one is the fault feedback signal for start-up control signal, another root.
The start-up control signal is divided into three kinds of situation: A, the 1Mhz square-wave signal: tuning controller issues the reset signal of bottom, accomplishes the bottom module failure is resetted; B has light signal: the starting command that high level signal, tuning controller issue.Completion is to the start-up control of bottom module; C, no light signal: the halt command that low level signal, tuning controller issue, accomplish shutdown operation to the bottom module.Fault and running status feedback signal are divided into two kinds of situation: A, and light signal is arranged: the bottom module is in the cold standby state; B, no light signal: the bottom module is in malfunction; C, the 1Mhz square-wave signal: the bottom module is in running status.
Bottom control changes through start-up control optical fiber level and carries out each module and operate accordingly, coordinates control unit simultaneously and changes through fault and running status feedback signal corresponding bottom floor units is controlled.Owing to be that optical fiber connects and can avoid because the device misoperation that electromagnetic interference causes the operation of assurance device reliable and stable.
2, power division
As shown in Figure 2, the CAN mode bus is formed with the coordination control unit in the bottom control unit.Receive the power instruction that higher level's monitoring issues by coordinating control unit, obtain the definite value of each module, be issued to the bottom control unit through CAN then, the operation of control corresponding module through power distributing unit.
Power division generally is divided into mean allocation, pro-rata and according to priority distributes.Mean allocation divided by battery pack number (not considering the otherness of battery pack), obtains the performance number that every Battery pack should be exported with power given; The otherness of battery pack has been considered in pro-rata, the pilosity that available horsepower is big, few the sending out that available horsepower is little; According to priority distribute and confirm priority to each battery pack with exactlying,, only start first Battery pack, as if moving, by that analogy greater than the highest module module full power that then priority is the highest of priority when power given during less than the highest battery pack of priority.Pro-rata can improve the utilance of system, the useful life that can improve battery during heavy duty.
Be most important two indexs of weighing the energy-storage system quality useful life of response time and battery in the practical application, therefore takes all factors into consideration and adopt second kind of power allocation scheme (pro-rata).Flow process such as Fig. 3 of pro-rata.Pro rata distribute required physical quantity such as following table.
The required physical quantity of table 1 pro-rata
| Name variable | Data name |
| PowerGiven | Power given |
| ChPowerSum | Available charge power sum |
| DisChPowerSum | Available discharge power sum |
| ChPowerEn[k] | The k Battery pack can be used charge power |
| DisChPowerEn[k] | The k Battery pack can be used discharge power |
| ChPower[k] | K Battery pack charge power |
| DisChPower[k] | K Battery pack discharge power |
3, from the sharing control of network operation energy storage device parallel connection
In network operation, because there is deviation in each energy storage device at output voltage amplitude and phase place, line impedance is also variant simultaneously.Therefore must have circulation during each inverter parallel connection, thereby make each inversion module can not load-sharing, part of module possibly work in overload, and then causes the collapse of parallel system.Suppress inverter loop current so when the inverter parallel connection, need add Parallel Control, guarantee each inverter load-sharing operate as normal.Its control strategy is as shown in Figure 4, and variable-definition is following among the figure:
Vcd is the system voltage real component, and Vcq is the system voltage idle component, and id is the system power real component; Iq is the system power idle component, and Pi is system's active power, and Qi is system's reactive power; Pave is a computing system active power set-point, and Qave is the idle set-point of computing system, the meritorious deviation of Δ Vd energy storage device; Δ Vq is the idle deviation of energy storage device, and V*d is a device active voltage set-point, and V*q is a device reactive voltage set-point; Idref is a device active current set-point, and iqref is a device reactive current set-point.
Identical in order to guarantee each inverter output voltage amplitude with phase angle, need between each inverter, to add power equalization control, guarantee the power-sharing between each inverter, suppress system's circulation.Power-sharing control owing to need the meritorious and reactive power of detection system output, has therefore added the time-delay of a 20ms, and the current-sharing effect is better, and stability is high, has stronger disturbance rejection property.
Its corresponding output voltage is that benchmark carries out the dq decoupling zero for
and with parallelly connected line voltage during inverter output average power, then has:
Can be known that by following formula when line impedance was pure perception, inverter output voltage d axle component difference caused idle unbalanced, q axle difference causes meritorious output circulation.In order to realize the equilibrium of inverter power output, can outside contravarianter voltage control, add the PI control of power equalization, to suppress the circulation between the inverter.
Each bottom module is because the difference of hardware and software, causes each inverter output voltage amplitude, phase angle variant, therefore adopts the power outer shroud correction that in the inverter output voltage instruction, superposes, and equates thereby regulate each inverter output voltage.
4, to the demarcation and the balanced control of energy storage battery
Used large-capacity battery pack is undertaken by the monomer of low capacity all that connection in series-parallel forms in the energy-storage system; Though the connection in series-parallel of battery pack can improve the capacity of battery pack and withstand voltage; But increase along with battery strings parallel connection number; Each monomer the possibility of difference occurs also along with increase, and the difference of monomer can influence the capacity and the useful life of whole Battery pack.Though the consistency when battery dispatches from the factory can be done well, along with the use of battery, it is inevitably that difference appears in monomer, for the useful life and the utilance of system of improving energy-storage system, carries out equilibrium and is absolutely necessary putting in order Battery pack.
The balanced used balanced unit basic principle of battery is identical substantially: with little electric current the low monomer of voltage is charged, the monomer high to voltage discharges, to improve the consistency of monomer voltage.Equilibrium to battery has manual and automatic dual mode, and battery pack is wanted state out of service when manually balanced, clearly can reduce the utilance of system, and manually equilibrium is also very inconvenient concerning energy-storage system; Automatic equalization does not need people's participation, is accomplished automatically by system, can improve the utilance of system.Manually balanced and automatic equalization are to such as table 2.Automatic equalization also is divided into multiple mode: balanced and unconditional balanced under the stopped status.Equilibrium is only under the system-down state, just can carry out equilibrium under the stopped status, if system moves then and can't carry out equilibrium always; 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 the stopped status.
The manually balanced and automatic contrast of table 2
Balanced and unconditional balanced under table 3 stopped status
Utilance in the energy-storage system is one of most important index, therefore adopts the automatic equalization mode.And all there is certain defective in the automatic equalization mode that table 3 is mentioned, adopts half-way house: during the parallel running of many Battery packs, be chosen in as far as possible and carry out equilibrium under system-down or the holding state; If need equilibrium when discharging and recharging; Then only a Battery pack is carried out equilibrium; The battery pack that needs are balanced is shut down operation; Other battery pack operate as normal, the benefit that a Battery pack is balanced accomplishes the equilibrium of other batteries of continued/do like this is not influence portfolio effect, can significantly not reduce the utilance (only reducing the power of a Battery pack) of system again.Balanced flow process such as Fig. 5.
The sharing control of the storage battery balanced way of being mentioned among the above embodiment, parallel connection, power division mode etc. all belong to prior art, so do not do too much introduction.
Claims (4)
1. an extensive energy storage device control method for coordinating is characterized in that, the startup and the shutdown of tuning controller control bottom control unit, and the bottom control unit is to tuning controller feedback fault and running status; Tuning controller monitoring bottom module status and storage battery allow maximum can fill/put power, and power control unit issues the power definite value with pro-rata to each bottom control unit; In network operation, adopt the power equalization control mode of avoiding inverter loop current; The mode that is employed in automatic equalization under system-down or the holding state is carried out the equilibrium of storage battery.
2. a kind of extensive energy storage device control method for coordinating according to claim 1 is characterized in that, tuning controller control bottom control unit is through optical-fibre communications.
3. a kind of extensive energy storage device control method for coordinating according to claim 1 is characterized in that, in the power equalization control of said each inverter, adds a time-delay that is used for detection system active power of output and reactive power.
4. a kind of extensive energy storage device control method for coordinating according to claim 3 is characterized in that said time-delay is 20ms.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682414A (en) * | 2013-11-29 | 2015-06-03 | 比亚迪股份有限公司 | Method for converters to switch from grid-connecting to grid-disconnecting |
| CN105140939A (en) * | 2015-08-10 | 2015-12-09 | 江苏方天电力技术有限公司 | Energy storage system based active load multi-target coordination control method |
| CN111884243A (en) * | 2020-07-28 | 2020-11-03 | 合肥阳光新能源科技有限公司 | 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 |
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| US5646504A (en) * | 1994-04-15 | 1997-07-08 | Feldstein; Robert S. | Magnetically balanced multi-output battery charging system |
| CN1490915A (en) * | 2002-10-18 | 2004-04-21 | 艾默生网络能源有限公司 | Parallel single-phase DC-to-AC converter systems |
| 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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2012
- 2012-05-25 CN CN201210166570.9A patent/CN102684313B/en not_active Expired - Fee Related
Patent Citations (4)
| 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 |
| CN1490915A (en) * | 2002-10-18 | 2004-04-21 | 艾默生网络能源有限公司 | Parallel single-phase DC-to-AC converter systems |
| 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 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104682414A (en) * | 2013-11-29 | 2015-06-03 | 比亚迪股份有限公司 | Method for converters to switch from grid-connecting to grid-disconnecting |
| 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 |
| CN105140939A (en) * | 2015-08-10 | 2015-12-09 | 江苏方天电力技术有限公司 | Energy storage system based active load multi-target coordination control method |
| CN111884243A (en) * | 2020-07-28 | 2020-11-03 | 合肥阳光新能源科技有限公司 | 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 |
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