CN109193776A - A kind of power distribution method suitable for echelon battery energy storage - Google Patents
A kind of power distribution method suitable for echelon battery energy storage Download PDFInfo
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- CN109193776A CN109193776A CN201811166568.5A CN201811166568A CN109193776A CN 109193776 A CN109193776 A CN 109193776A CN 201811166568 A CN201811166568 A CN 201811166568A CN 109193776 A CN109193776 A CN 109193776A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/0071—Regulation of charging or discharging current or voltage with a programmable schedule
Abstract
The invention discloses a kind of power distribution methods suitable for echelon battery energy storage, comprising the following steps: step a, EMS energy management system obtains energy-storage system information；Step b, EMS energy management system obtains needing the compensation general power of dispatching distribution；Compensation general power is assigned to current energy-storage system group by step c；Step d repeats step c, successively calculates and update the power that each energy-storage system group needs to distribute；Step e, EMS energy management system needs the power distributed to be sent respectively to the PCS of each energy-storage system group by communication instruction, by each energy-storage system group, controls the charge-discharge electric power of battery pack.The present invention can make each collecting and distributing type energy-storage system in system receive EMS Energy Management System dispatch command, dispatch command is sent to each energy-storage system, each energy-storage system controls online power according to instruction.
Description
Technical field
The present invention relates to battery energy storage systems, and in particular to a kind of power distribution method suitable for echelon battery energy storage.
Background technique
EMS (Energy Manage System, Energy Management System) Energy Management System carries out system coordination management,
EMS Energy Management System is the control centre of micro-grid system operational management, is responsible for the execution of operational management strategy.Usually by this
Ground server is equipped with peripheral interface units and completes the acquisition of micro-grid system data and Web Publishing function, according to collected data
Information passes through certain logical algorithm, completes the functions such as power dispatching and the control protection of equipment by local controller.Micro- electricity
The operational management strategy of net is required to cooperation power grid detection device by platform United Dispatching, controls distributed generation resource
Operation with and off-network switch.
For energy-storage system when being incorporated into the power networks, EMS Energy Management System integrally controls the performance number of multiple energy-storage systems, at this time
Current energy-storage system can be charged state, or discharge condition.In such working condition, a kind of power is needed
Distribution method handles when there is multiple energy-storage systems under the same EMS energy management system, needs asking for co-simulation modeling power
Topic.Under this working condition, two inconsistence problems that echelon battery there may also be: A, battery is new and old inconsistent, B, battery
Manufacturer may be inconsistent, both of these problems are difficult to control the charge and discharge SOC of each energy-storage system, and are difficult entirety
Manage and constrain the charge-discharge electric power of each energy-storage system.
Summary of the invention
On the basis of the prior art, the invention discloses a kind of power distribution sides suitable for echelon battery energy storage
Method.
Technical scheme is as follows:
A kind of power distribution method suitable for echelon battery energy storage, comprising the following steps:
Step a, EMS energy management system obtains energy-storage system information；
Step b, EMS energy management system obtains the generating equipment of whole system and the information of electrical equipment, is needed
The compensation general power of dispatching distribution；If compensation general power is Pcontrol；Work as PcontrolWhen > 0, energy-storage system is discharge mode, when
PcontrolWhen < 0, energy-storage system is charge mode；
Step c, compensation general power is assigned to current energy-storage system group: step c is specifically included:
Step i selectes the current energy-storage system group of power to be allocated；By the value of the charge residue SOC of n group energy-storage system from
It is small to sort to big；If energy-storage system is charge mode, successively chosen since the minimum value of the charge residue SOC of energy-storage system
Its corresponding energy-storage system group；If energy-storage system is discharge mode, since the maximum value of the charge residue SOC of energy-storage system
Successively choose its corresponding energy-storage system group；
Shown in the charge residue SOC of energy-storage system such as formula (1):
SOC={ SOC0,SOC1,SOC2,SOC3...SOCn-1} (1)
Shown in power array such as formula (2) corresponding to the charge residue SOC of energy-storage system:
P={ P0,P1,P2,P3...Pn-1} (2)
Difference of the energy-storage system that foundation step i is judged as charge mode or discharge mode, selection progress step ii
Or step iii；
Step ii, if energy-storage system is charge mode, Pcontrol< 0, then have:
Firstly, judging that current energy-storage system group forbids charged state or permission charged state according to formula (3)；
If current energy-storage system group is to allow charged state, judge that current energy-storage system group can permit according to formula (4)
Perhaps the maximum charge power to charge；
Wherein,After being distributed for upper one group of energy-storage system group by the end of current energy-storage system group, remain
Remaining power to be allocated；
Secondly, remaining power to be allocated is given current energy-storage system group；
Finally, carrying out step iiii；
Step iii, if energy-storage system is discharge mode, Pcontrol> 0, then have:
Firstly, judging that current energy-storage system group forbids discharge condition or permission discharge condition according to formula (5)；
If current energy-storage system is to allow discharge condition, judge that current energy-storage system can allow for putting according to formula (6)
The maximum discharge power of electricity；
Wherein,After being distributed for upper one group of energy-storage system group by the end of current energy-storage system group, remain
Remaining power to be allocated；
Secondly, remaining power to be allocated is given current group energy-storage system；
Finally, carrying out step iiii；
Step iiii updates the power of current energy-storage system group；
Step d repeats step c, successively calculates and update the power that each energy-storage system group needs to distribute；
Step e, EMS energy management system by communication instruction, distinguish by the power that each energy-storage system group is needed to distribute
It is sent to the PCS of each energy-storage system group, controls the charge-discharge electric power of battery pack.
Its further technical solution is that the energy-storage system information includes BMS information and PCS information；The BMS information
Including battery failures information and SOC information；The PCS information include the rated power of energy-storage system, energy-storage system voltage and/
Or the real time information of the electric current of energy-storage system.
The method have the benefit that:
Energy-storage system is when being incorporated into the power networks, the power controlled required for EMS Energy Management System meeting collection site system, warp
Internal compensation algorithm is crossed, and then obtaining current energy-storage system should be by after the total power value of system call, calculation through the invention
Method can make each collecting and distributing type energy-storage system in system receive EMS Energy Management System dispatch command, dispatch command is sent
To each energy-storage system, each energy-storage system controls online power according to instruction.
Method of the present invention can guarantee that 1, multiple energy-storage systems under the same EMS Energy Management System, cooperate with
Distribution power, so that each energy-storage system is assigned to its optimum performance number, no more than the bound of its charge and discharge；2, this hair
The bright method solves two inconsistence problems of echelon battery: A, the new and old inconsistent B of battery, producer are possible inconsistent.
For both of these problems, method of the present invention makes the charge and discharge SOC variable depth of a, energy-storage system, b, can be to charging
Reach SOCmaxOr electric discharge reaches SOCmin, being capable of active constraint charge-discharge electric power.
Detailed description of the invention
Fig. 1 is the structural schematic diagram suitable for echelon battery energy storage system.
Fig. 2 is flow chart of the invention.
Specific embodiment
As shown in Figure 1, echelon battery energy storage system includes EMS energy management system and n group energy-storage system, EMS can source capsule
Reason system and n group energy-storage system can between communication connection.It further include electrical equipment and generating equipment.Electrical equipment and EMS energy
It is communication connection between generating equipment and EMS energy management system between management system.Wherein generating equipment can be light
Lie prostrate generating equipment or wind-powered electricity generation generating equipment etc..
In n group energy-storage system, every group of energy-storage system includes battery pack, BMS (BMS:Battery Manage System
Battery management system) and PCS (Power Converter System, power conversion system) two-way inverter.BMS with connect electricity
Pond group, for managing and calculating the current properties of battery, battery pack is connected with the two-way inverter of PCS.
Fig. 2 is flow chart of the invention, as shown in Fig. 2, be suitable for echelon battery energy storage power distribution method include with
Lower step:
Step a, EMS energy management system obtains energy-storage system information.Energy-storage system information mainly include BMS information and
PCS information.BMS information mainly includes battery failures information and SOC information.PCS information mainly includes the specified function of energy-storage system
The real time information etc. of the electric current of rate, the voltage of energy-storage system and/or energy-storage system.
Step b, EMS energy management system obtains the generating equipment of whole system or entire plant area and the letter of electrical equipment
Breath, by backoff algorithm, obtains the charge and discharge electronic compensating general power for needing dispatching distribution.Backoff algorithm realizes power in order to scene
The target of regulation is realized using energy-storage system charge and discharge control and is compensated.Field application is for example, electricity using at the peak time is adjusted；There is power generation to set
Situations such as standby (photovoltaic or wind-powered electricity generation etc.) generates power for their own use.Specific backoff algorithm be those skilled in the art pass through open document or
What the common technical knowledge of person this field can be learnt, be not the key that it is of the invention, repeat no more.
If compensation general power is Pcontrol.Work as PcontrolWhen > 0, energy-storage system is discharge mode, works as PcontrolWhen < 0, storage
Energy system is charge mode.
Compensation general power is assigned to every group of energy-storage system by step c.The specific distribution method of step c includes:
Step i selectes the current energy-storage system of power to be allocated.By the value of the charge residue SOC of n group energy-storage system from small
To big sequence.If energy-storage system is charge mode, according to the numerical values recited of the charge residue SOC of energy-storage system, from energy storage system
The minimum value of the charge residue SOC of system starts the corresponding energy-storage system group of charge residue SOC for successively choosing energy-storage system, and will
Compensation general power is sequentially allocated.If energy-storage system is discharge mode, similarly, from the maximum of the charge residue SOC of energy-storage system
Its corresponding energy-storage system group is successively chosen in value beginning, and compensation general power is sequentially allocated.
Shown in the charge residue SOC of energy-storage system such as formula (1):
SOC={ SOC0,SOC1,SOC2,SOC3...SOCn-1} (1)
Shown in such as formula (2) of power array P corresponding to the charge residue SOC of energy-storage system:
P={ P0,P1,P2,P3...Pn-1} (2)
The energy-storage system that foundation step i is judged is the difference of charge mode or discharge mode, selects step ii respectively
Or step iii.If energy-storage system is charge mode, step ii is carried out, if energy-storage system is discharge mode, is carried out
Step iii.
Step ii, if energy-storage system is charge mode, Pcontrol< 0, then have:
Firstly, judging that current energy-storage system group forbids charged state or permission charged state according to formula (3)；
If the charge residue SOC of energy-storage system has had arrived at the maximum allowable charging SOC of current energy-storage system group
Upper limit SOCMax_n, then current energy-storage system group is to forbid charged state, then without power distribution.If current energy-storage system group
To allow charged state, judge that current energy-storage system group can allow for the maximum charge power of charging according to formula (4)；
Wherein,After being distributed for upper one group of energy-storage system group by the end of current energy-storage system group, remain
Remaining power to be allocated；
Secondly, remaining power to be allocated is given current energy-storage system group；
Finally carry out step iiii.
Step iii, if energy-storage system is discharge mode, Pcontrol> 0, then have:
Firstly, judging that current energy-storage system group forbids discharge condition or permission discharge condition according to formula (5)；
If the charge residue SOC of energy-storage system has had arrived at the lower limit SOC that electric discharge allowsMin_n, then current energy storage system
System group is to forbid discharge condition, then without power distribution；If current energy-storage system is to allow discharge condition, according to formula (6)
Judge that current energy-storage system can allow for the maximum discharge power of electric discharge；
Wherein,After being distributed for upper one group of energy-storage system group by the end of current energy-storage system group, remain
Remaining power to be allocated；
Secondly, remaining power to be allocated is given current group energy-storage system；
Finally carry out step iiii.
Step iiii updates the power of current energy-storage system group, for example, PRef_nN=2 update P2。
Have in (6) in formula (1)~formula of step c:
N: natural number represents the sum of energy-storage system group；0,1 ... ..., n-1 are the serial number of n group energy-storage system group.
Plimited_n: the charge power or discharge power limit value of n-th group energy-storage system；
PRef_n: the allotment power of n-th group energy-storage system；
Pcontrol: EMS needs the compensation general power of dispatching distribution；
SOCn: the charge of n-th group energy-storage system is remaining；
SOCMax_n: the maximum allowable charging SOC upper limit of n-th group energy-storage system；
SOCMin_n: the electric discharge SOC lower limit of n-th group energy-storage system minimum allowable；
PSocLimit_n: the SOC of n-th group energy-storage system limits power；
PPcsLimit_n: the PCS rated power of n-th group energy-storage system；
PBmsLimit_n: the BMS of n-th group energy-storage system limits power (limiting charge-discharge electric power under battery some cases)；
SOCMAXn: the maximum charge upper limit SOC of n-th group energy-storage system, if allowing full of the value to be 1.
Step d repeats step c, successively calculates and update the power that each energy-storage system group needs to distribute；
Step e, EMS energy management system by communication instruction, distinguish by the power that each energy-storage system group is needed to distribute
It is sent to the PCS of each energy-storage system group, controls the charge-discharge electric power of battery pack.
What has been described above is only a preferred embodiment of the present invention, and present invention is not limited to the above embodiments.It is appreciated that this
The other improvements and change that field technical staff directly exports or associates without departing from the spirit and concept in the present invention
Change, is considered as being included within protection scope of the present invention.
Claims (2)
1. a kind of power distribution method suitable for echelon battery energy storage, which comprises the following steps:
Step a, EMS energy management system obtains energy-storage system information；
Step b, EMS energy management system obtains the generating equipment of whole system and the information of electrical equipment, obtains needing to dispatch
The compensation general power of distribution；If compensation general power is Pcontrol；Work as PcontrolWhen > 0, energy-storage system is discharge mode, when
PcontrolWhen < 0, energy-storage system is charge mode；
Step c, compensation general power is assigned to current energy-storage system group: step c is specifically included:
Step i selectes the current energy-storage system group of power to be allocated；By the value of the charge residue SOC of n group energy-storage system from it is small to
Big sequence；If energy-storage system is charge mode, it is right since the minimum value of the charge residue SOC of energy-storage system successively to choose its
The energy-storage system group answered；If energy-storage system is discharge mode, since the maximum value of the charge residue SOC of energy-storage system successively
Choose its corresponding energy-storage system group；
Shown in the charge residue SOC of energy-storage system such as formula (1):
SOC={ SOC0,SOC1,SOC2,SOC3...SOCn-1} (1)
Shown in power array such as formula (2) corresponding to the charge residue SOC of energy-storage system:
P={ P0,P1,P2,P3...Pn-1} (2)
The energy-storage system judged according to step i be charge mode perhaps the difference selection progress step ii of discharge mode or
Step iii；
Step ii, if energy-storage system is charge mode, Pcontrol< 0, then have:
Firstly, judging that current energy-storage system group forbids charged state or permission charged state according to formula (3)；
If current energy-storage system group is to allow charged state, judge that current energy-storage system group can allow for filling according to formula (4)
The maximum charge power of electricity；
Wherein,It is remaining after being distributed for upper one group of energy-storage system group by the end of current energy-storage system group
Power to be allocated；
Secondly, remaining power to be allocated is given current energy-storage system group；
Finally, carrying out step iiii；
Step iii, if energy-storage system is discharge mode, Pcontrol> 0, then have:
Firstly, judging that current energy-storage system group forbids discharge condition or permission discharge condition according to formula (5)；
If current energy-storage system is to allow discharge condition, judge that current energy-storage system can allow for electric discharge according to formula (6)
Maximum discharge power；
Wherein,It is remaining after being distributed for upper one group of energy-storage system group by the end of current energy-storage system group
Power to be allocated；
Secondly, remaining power to be allocated is given current group energy-storage system；
Finally, carrying out step iiii；
Step iiii updates the power of current energy-storage system group；
Step d repeats step c, successively calculates and update the power that each energy-storage system group needs to distribute；
Step e, EMS energy management system needs the power distributed to send respectively by communication instruction, by each energy-storage system group
To the PCS of each energy-storage system group, the charge-discharge electric power of battery pack is controlled.
2. being suitable for the power distribution method of echelon battery energy storage as described in claim 1, which is characterized in that the energy storage system
Information of uniting includes BMS information and PCS information；The BMS information includes battery failures information and SOC information；The PCS packet
Include the real time information of the electric current of the rated power of energy-storage system, the voltage of energy-storage system and/or energy-storage system.
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| CN112531828A (en) * | 2020-11-26 | 2021-03-19 | 许继集团有限公司 | Electrochemical energy storage power station BMS cooperative control system and method |
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| CN115207984A (en) * | 2021-04-09 | 2022-10-18 | 正泰集团研发中心(上海)有限公司 | Power distribution method of micro-grid system and micro-grid system |
| CN115313463A (en) * | 2022-08-31 | 2022-11-08 | 中国长江三峡集团有限公司 | Distributed electrochemical energy storage system |
| WO2023077861A1 (en) * | 2021-11-03 | 2023-05-11 | 珠海格力电器股份有限公司 | Charging and discharging control method and apparatus for energy storage system, controller, and energy storage system |
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