CN103187750B - Megawatt battery energy storage power station real-time power control method and system thereof - Google Patents
Megawatt battery energy storage power station real-time power control method and system thereof Download PDFInfo
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- CN103187750B CN103187750B CN201110459904.7A CN201110459904A CN103187750B CN 103187750 B CN103187750 B CN 103187750B CN 201110459904 A CN201110459904 A CN 201110459904A CN 103187750 B CN103187750 B CN 103187750B
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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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- 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
- H02J15/00—Systems for storing electric energy
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The invention relates to a megawatt battery energy storage power station real-time power control method and a system thereof. The method includes the following steps of A), reading a total power demand of a battery energy storage power station and related operation data of the power station in real time, and conducting storing and managing on the total power demand and the operation data; B) obtaining initial power command value of battery energy storage subelements of the battery energy storage power station; C) conducting real-time diagnosis and amendment on the initial power command value of the battery energy storage subelements so as to confirm power command value to be allocated to the battery energy storage subelements; and D) after the power command value of the battery energy storage subelements is collected, outputting the power command value to the battery energy storage power station so as to achieve real-time control on the battery energy storage power station. The system comprises a communication module, a data storage and management module, a total power initial allocation control module and a real-time adjusting module. The method and the system can conveniently and efficiently achieve the aims of controlling and allocating of real-time power of a megawatt lithium ion battery energy storage power station.
Description
Technical field
The invention belongs to intelligent grid and stored energy and switch technology field, be specifically related to a kind of realtime power control method and system thereof of rule-based high-power Large Copacity megawatt battery energy storage power station, be particularly useful for the power of battery and the battery energy management method of megawatt battery energy storage power station in extensive wind-solar-storage joint electricity generation system.
Background technology
Country's wind-light storage transmission demonstration project is that State Grid Corporation of China builds the first batch of pilot project of strong intelligent grid, with " electrical network friendly " generation of electricity by new energy for target, with " advance, flexibility, exemplary, economy " for feature, it is the renewable energy comprehensive demonstration project of worldwide largest, collection wind-powered electricity generation, photovoltaic generation, energy storage and power transmission engineering quaternity at present.Wherein, national wind-light storage transmission demonstration project (first phase) is planned to build and is established wind-powered electricity generation 100MW, photovoltaic generation 40MW and energy storage device 20MW (comprising 14MW ferric phosphate lithium cell energy-storage system, 2MW all-vanadium flow battery energy-storage system, 4MW sodium-sulfur battery energy storage system).
Along with the development of lithium ion battery and integrated technology thereof, application lithium battery energy storage battery power station is gone to realize level and smooth honourable power stage, tracking plan generating, participation system frequency modulation, peak load shifting, the meritorious multiple application such as emergency response, transient voltage first support of exerting oneself of transient state, has become a kind of feasible program.Wherein one of key issue grasps the power station integrated control technology of extensive lithium battery energy storage battery.
From the angle of battery energy storage, excessive charging and excessive electric discharge all can impact the life-span of battery.Therefore, monitored battery charge state, in the good overall power requirement of the inner reasonable distribution of energy-accumulating power station, and the state-of-charge of battery is controlled to be necessary within the specific limits.
At present about the patent, document, technical report etc. of the gross power control aspect in real time based on megawatt-grade high-power high capacity lithium ion battery energy-accumulating power station are considerably less, the core technology needing further investigation and explore extensive battery energy storage power station Comprehensive Control and be incorporated into the power networks, solves the key issue of extensive battery energy storage power station cooperation control and energy management.
Summary of the invention
For the problems referred to above, an object of the present invention is to provide a kind of easy to operate, realtime power control method of being easy to the megawatt battery energy storage power station realized, and the method can meet the real-time overall power requirement of energy-accumulating power station and the real-time monitoring requirement of high capacity cell energy-accumulating power station stored energy simultaneously.
Control method of the present invention is achieved by the following technical solution:
A kind of megawatt battery energy storage power station real-time power control method, comprises the following steps:
Steps A, reads the overall power requirement of battery energy storage power station and the relevant service data in this power station in real time, and carries out store and management to above-mentioned overall power requirement and service data;
Step B, judges the state of battery energy storage power station according to battery energy storage power station overall power requirement, and obtains the initial power bid value of each battery energy storage subelement in battery energy storage power station by corresponding preset rules;
Step C, carries out real-time diagnosis and correction to the initial power bid value of each battery energy storage subelement, to be allocated to the power command value of each battery energy storage subelement to determine;
Step D, treats after the power command value distributing to each battery energy storage subelement gathers and exports battery energy storage power station to, to realize carrying out power division to each battery energy storage subelement and controlling the realtime power of battery energy storage power station.
Wherein, the relevant service data of described battery energy storage power station comprises: the controllable state value of each battery energy storage subelement, SOC, maximum permission discharge power, maximum permission charge power and rated power in battery energy storage power station.
Wherein, described step B comprises the steps:
Judge the state of battery energy storage power station;
When battery energy storage power station overall power requirement be on the occasion of time, represent that this battery energy storage power station will be in discharge condition, then obtained the initial power bid value of each battery energy storage subelement by the first preset rules;
When battery energy storage power station overall power requirement is negative value, represent that this battery energy storage power station will be in charged state, then obtained the initial power bid value of each battery energy storage subelement by the second preset rules;
When battery energy storage power station overall power requirement is zero, represent that this battery energy storage power station will be in zero power phase, then the direct power command value by all battery energy storage subelements is set to zero.
Wherein, described first preset rules comprises:
1) ratio value accounting for each controlled battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation when the overall power requirement of battery energy storage power station is more than or equal to preset value
time, then the initial power bid value of each battery energy storage subelement is the product of aforementioned proportion value and the maximum permission discharge power of corresponding controlled battery energy storage subelement;
2) ratio value accounting for each controlled battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation when the overall power requirement of battery energy storage power station is greater than preset value
and be less than
time, then the initial power bid value of each battery energy storage subelement be the SOC of corresponding controlled battery energy storage subelement account for current all controlled battery energy storage subelement SOC summations ratio value, be multiplied by battery energy storage power station overall power requirement again;
3) ratio value accounting for each controlled battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation when the overall power requirement of battery energy storage power station is less than or equal to preset value
time,
First, the current available maximum discharge power characteristic value of each battery energy storage subelement is calculated;
Then, the order ascending according to maximum discharge power characteristic value sorts to each battery energy storage subelement, and the ratio value accounting for the current all controlled battery energy storage subelements of this energy-accumulating power station maximum permission discharge power summation with battery energy storage power station current total power demand is more than or equal to preset value
for condition, exclusive method is adopted to calculate the minimum number battery energy storage subelement meeting above-mentioned condition;
Finally, the initial power bid value of above-mentioned minimum number battery energy storage subelement be the SOC of corresponding controlled battery energy storage subelement account for current minimum number controlled battery energy storage subelement SOC summation ratio value, be multiplied by battery energy storage power station current total power demand again; The initial power bid value of all the other battery energy storage subelements is all set to 0.
Described second preset rules comprises:
1) when the overall power requirement of battery energy storage power station
the ratio value accounting for each controlled battery energy storage subelement of this energy-accumulating power station maximum permission charge power summation is more than or equal to preset value
time, then the initial power bid value of each battery energy storage subelement is the product of aforementioned proportion value and the maximum permission charge power of corresponding controlled battery energy storage subelement;
2) ratio value accounting for each controlled battery energy storage subelement of this energy-accumulating power station maximum permission charge power summation when the overall power requirement of battery energy storage power station is greater than preset value
and be less than
time, then the initial power bid value of each battery energy storage subelement be the discharge condition value of corresponding controlled battery energy storage subelement account for each controlled battery energy storage subelement discharge condition value summation ratio value, be multiplied by battery energy storage power station current total power demand again;
3) ratio value accounting for each controlled battery energy storage subelement of this energy-accumulating power station maximum permission charge power summation when the overall power requirement of battery energy storage power station is less than or equal to preset value
time,
First, the current available maximum charge power features value of each battery energy storage subelement is calculated;
Then, be worth ascending order according to maximum charge power features to sort to each battery energy storage subelement, the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation with battery energy storage power station current total power demand is more than or equal to preset value
for condition, exclusive method is adopted to calculate the minimum number battery energy storage subelement meeting above-mentioned condition;
Finally, the initial power bid value of above-mentioned minimum number battery energy storage subelement be the discharge condition value of corresponding controlled battery energy storage subelement account for current minimum number controlled battery energy storage subelement discharge condition value summation ratio value, be multiplied by battery energy storage power station current total power demand again; The initial power bid value of all the other battery energy storage subelements is all set to 0;
In above-mentioned steps, described controlled battery energy storage subelement is maximum to be allowed to put, charge power summation is each controlled battery energy storage subelement maximumly allows to put, charge power sum, controlled battery energy storage subelement is charged, discharge condition value summation is each controlled battery energy storage subelement charged, discharge condition value sum.Described controlled battery energy storage subelement maximum permission discharge power is the product of the controllable state value permission discharge power maximum with it of battery energy storage subelement, the SOC of controlled battery energy storage subelement is the controllable state value of battery energy storage subelement and the product of its SOC, controlled battery energy storage subelement maximum permission charge power is the product of the controllable state value permission charge power maximum with it of battery energy storage subelement, and the discharge condition value of controlled battery energy storage subelement is the controllable state value of battery energy storage subelement and the product of its discharge condition value.Discharge condition value (SOD:State of Discharge) equals 1 and deducts its SOC (SOC:State of Charge).
Wherein, when battery energy storage subelement is controlled, the controllable state value of this subelement is 1; Otherwise value is 0.
Wherein, described in
with
span be 0.7 ~ 0.9, described in
with
span be 0.2 ~ 0.4, described in
with
span be 0.7 ~ 0.9.
Wherein, described step C comprises the steps:
Real-time diagnosis is carried out to the initial power bid value of each battery energy storage subelement that step B calculates, see if there is the situation violating each battery energy storage subelement maximum permission discharge power and the restriction of maximum permission charge power to occur, if had, then on-line amending carried out to each battery energy storage subelement and calculate again; As not having, then the initial power bid value of the battery energy storage subelement calculated by step B is set to its power command value.
Wherein, described on-line amending and the method that calculates again comprise the steps:
When battery energy storage power station overall power requirement be on the occasion of time, if when the initial power bid value that any battery energy storage subelement occurs violates the situation of this subelement maximum permission discharge power limit value (namely the initial power bid value of any battery energy storage subelement is greater than the maximum permission discharge power of this subelement), then search the battery energy storage subelement number meeting above-mentioned situation, and the maximum permission discharge power of these battery energy storage subelements is set as its power command value, the power command value of remaining each battery energy storage subelement is the ratio value that remaining each controlled battery energy storage subelement maximum permission discharge power accounts for each controlled battery energy storage subelement of current remainder maximum permission discharge power summation, be multiplied by battery energy storage power station current total power demand and the difference of each battery energy storage subelement maximum permission discharge power summation meeting above-mentioned situation again.
When battery energy storage power station overall power requirement is negative value, if when the initial power bid value that any battery energy storage subelement occurs violates the situation of its maximum permission charge power limit value (namely the absolute value of any battery energy storage subelement initial power bid value is greater than the absolute value of the maximum permission charge power of this subelement), then search the battery energy storage subelement number meeting above-mentioned situation, and the maximum permission charge power of these battery energy storage subelements is set as its power command value, the power command value of remaining each battery energy storage subelement is the ratio value that remaining each controlled battery energy storage subelement maximum permission charge power accounts for remaining all controlled battery energy storage subelement maximum permission charge power summation, be multiplied by battery energy storage power station current total power demand and the difference of each battery energy storage subelement maximum permission charge power summation meeting above-mentioned situation again.
Another object of the present invention is to propose a kind of megawatt battery energy storage power station real-time power control system, this system comprises:
Communication module, for the relevant service data of the real-time overall power requirement and power station that read battery energy storage power station in real time, and export the power command value of each battery energy storage subelement to battery energy storage power station, realize carrying out power division to each battery energy storage subelement in battery energy storage power station;
Data storage and management module, for the real-time overall power requirement of store and management and relevant service data, and the power command value of each battery energy storage subelement that real-time adjustment module is returned gather after reach communication module and export;
Gross power original allocation control module, for judging according to battery energy storage power station overall power requirement the state that battery energy storage power station will be in, and calculates the initial power bid value of each battery energy storage subelement by corresponding preset rules; With
Real-time adjustment module, for carrying out real-time diagnosis and correction to the initial power bid value of each battery energy storage subelement, to determine the power command value of each battery energy storage subelement.
Compared with prior art, the beneficial effect that the present invention reaches is:
The invention provides a kind of MW class battery (lithium battery or sodium-sulphur battery) energy-accumulating power station realtime power control method and system has easy to operate, be easy to the advantages such as realization and grasp in actual applications, the method and system mainly combine can represent battery energy storage subelement realtime power characteristic permission charging and discharging capabilities (namely, the maximum permission discharge power of each battery energy storage subelement, the maximum permission charge power of each battery energy storage subelement etc.) and the state-of-charge SOC of battery energy storage subelement stored energy characteristic can be represented, distribute online based on the overall power requirement value of given judgment standard to battery energy storage power station, while achieving real-time distribution battery energy storage power station overall power requirement, also achieve the energy management of grid-connected megawatt battery energy storage power station and control in real time.
Accompanying drawing explanation
Fig. 1 is the system schematic of MW class lithium ion battery energy-accumulating power station embodiment;
Fig. 2 is the structural representation that MW class lithium ion battery energy-accumulating power station realtime power distributes control system embodiment;
Fig. 3 is the structural representation of gross power original allocation control module embodiment;
Fig. 4 is the structural representation of real-time adjustment module embodiment;
Fig. 5 is the FB(flow block) of MW class lithium ion battery energy-accumulating power station realtime power control method embodiment.
Embodiment
Control method of the present invention and system can be applied to lithium ion battery energy-accumulating power station or sodium-sulfur battery energy storage power station, below for lithium ion battery, be described in further detail control method of the present invention and system by reference to the accompanying drawings.
As shown in Figure 1, lithium ion battery energy-accumulating power station comprises two way convertor and multiple lithium ion battery energy storage subelement, can perform the on off control and charge-discharge electric power instruction etc. to lithium ion battery energy storage subelement by two way convertor.
Fig. 2 shows the structured flowchart that lithium ion battery energy-accumulating power station realtime power distributes control system embodiment.As shown in Figure 2, the control system of this example is realized by communication module 10, data storage and management module 20, gross power original allocation control module 30 and the real-time adjustment module 40 be arranged in remote server.Communication module 10 in this control system is connected by wired or wireless network with battery energy storage power station, carry out data interaction between this control system and lithium ion battery energy-accumulating power station and communicated, thus be embodied as each lithium ion battery energy storage subelement in battery energy storage power station and carry out power division, and realtime power monitoring is carried out to battery energy storage power station, wherein
Communication module 10, for the relevant service data of the real-time overall power requirement value He this power station that receive lithium ion battery energy-accumulating power station, and exports the power command value of each lithium ion battery energy storage subelement of giving to be allocated to battery energy storage power station.
Data storage and management module 20, for real-time overall power requirement value and the relevant service data (these data can comprise real time data and historical data) of store and management lithium ion battery energy-accumulating power station; And be responsible for each lithium ion battery energy storage subelement power command value calculated to carry out gathering and assignment to relevant interface variables, called by communication module for remote server.
Gross power original allocation control module 30, for determining each lithium ion battery energy storage subelement initial power bid value in real time.
Real-time adjustment module 40, for calculating and determining to be allocated to the power command value of each lithium ion battery energy storage subelement.
As shown in Figure 3, described gross power original allocation control module comprises:
Judge module, for judging the state of battery energy storage power station according to battery energy storage power station current total power demand: when battery energy storage power station current total power demand as on the occasion of time, represent that this battery energy storage power station will be in discharge condition, then calculated the initial power bid value of each battery energy storage subelement by the first Executive Module; When battery energy storage power station current total power demand is negative value, represent that this battery energy storage power station will be in charged state, then calculated the initial power bid value of each battery energy storage subelement by the second Executive Module; When the current total power requirements of battery energy storage power station is zero, represent that this battery energy storage power station will be in zero power phase, then the power command value of each battery energy storage unit is directly set by the 3rd Executive Module;
First Executive Module, for when battery energy storage power station will be in discharge condition, will calculate the initial power bid value of each battery energy storage subelement;
Second Executive Module, for when battery energy storage power station will be in charged state, will calculate the initial power bid value of each battery energy storage subelement; With
3rd Executive Module is zero for directly arranging the power command value of all battery energy storage subelements.
Wherein, described first Executive Module comprises:
First performs subelement I, is more than or equal to for the ratio value accounting for the current each controlled lithium ion battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation when lithium ion battery energy-accumulating power station current total power demand
time, calculate the initial power bid value of each lithium ion battery energy storage subelement;
First performs subelement II, is greater than for the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation when lithium ion battery energy-accumulating power station current total power demand
and be less than
time, calculate the initial power bid value of each lithium ion battery energy storage subelement; With
First performs subelement III, is less than or equal to for the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation when lithium ion battery energy-accumulating power station current total power demand
time,
First, the current available maximum discharge power characteristic value of each lithium ion battery energy storage subelement is calculated;
Then, the order ascending according to maximum discharge power characteristic value sorts to each battery energy storage subelement, and the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation with battery energy storage power station current total power demand is more than or equal to
for condition, exclusive method is adopted to calculate minimum number battery energy storage subelement;
Finally, recalculate the initial power bid value of minimum number lithium ion battery energy storage subelement, the initial power bid value of all the other battery energy storage subelements is all set to 0;
Described second Executive Module comprises:
Second performs subelement I, is more than or equal to for the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission charge power summation when battery energy storage power station current total power demand
time, calculate the initial power bid value of each battery energy storage subelement;
Second performs subelement II, is greater than for the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission charge power summation when battery energy storage power station current total power demand
and be less than
time, calculate the initial power bid value of each battery energy storage subelement; With
Second performs subelement III, is less than or equal to for the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission charge power summation when battery energy storage power station current total power demand
time,
First, the current available maximum charge power features value of each battery energy storage subelement is calculated;
Then, be worth ascending order according to maximum charge power features to sort to each battery energy storage subelement, the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission charge power summation with battery energy storage power station current total power demand is more than or equal to
for condition, exclusive method is adopted to calculate minimum number battery energy storage subelement;
Finally, recalculate the initial power bid value of minimum number battery energy storage subelement, the initial power bid value of all the other battery energy storage subelements is all set to 0.
As shown in Figure 4, described real-time adjustment module comprises:
Real-time diagnosis unit, for carrying out real-time diagnosis to the initial power bid value of each lithium ion battery energy storage subelement, seeing if there is the situation violating each battery energy storage subelement maximum permission discharge power and the restriction of maximum permission charge power and occurring; With
Computing unit, for the diagnostic result according to real-time diagnosis unit, carries out on-line amending and calculates or directly the initial power bid value of respective battery energy storage subelement be set to its power command value.
Wherein, described computing unit comprises:
First computation subunit, for when lithium ion battery energy-accumulating power station will be in discharge condition, if when the initial command value that arbitrary lithium ion battery energy storage subelement occurs is greater than the situation of its maximum permission discharge power, then search the battery energy storage subelement number meeting above-mentioned situation, and the maximum permission discharge power of these battery energy storage subelements is set as its power command value, the power command value of remaining each battery energy storage subelement recalculates;
Second computation subunit, for when lithium ion battery energy-accumulating power station will be in charged state, if when the initial command value that arbitrary lithium ion battery energy storage subelement occurs violates the situation of its maximum permission charge power restriction, then search the battery energy storage subelement number meeting above-mentioned situation, and the maximum permission charge power of these battery energy storage subelements is set as its power command value, the power command value of remaining each battery energy storage subelement recalculates; With
3rd computation subunit, is set to its power command value for the direct initial power bid value by corresponding lithium ion battery energy storage subelement.
Fig. 5 shows rule-based MW class lithium ion battery energy-accumulating power station realtime power control method block diagram in this example.Below in conjunction with concrete implementation step, be described in detail to each rule and execution mode thereof, the method comprises the steps:
Steps A, to be read data by communication module 10 be read the relevant service data of lithium ion battery energy-accumulating power station overall power requirement value that host computer issues and lithium ion battery energy-accumulating power station, then above-mentioned overall power requirement value and relevant service data reached data storage and management module 20 and carry out store and management.
Step B, based on gross power original allocation control module, calculate each lithium ion battery energy storage subelement initial power bid value in energy-accumulating power station in real time.
Step C, based on real-time adjustment module, real-time diagnosis is carried out to each lithium ion battery energy storage subelement initial power bid value and after revising, to be allocated to the power command value of each battery energy storage subelement to determine;
Step D, step C is calculated to be allocated to the power command value of each lithium ion battery energy storage subelement after data storage and management module gathers, export lithium ion battery energy-accumulating power station to by communication module.
In step, communication module 10 is except reading the overall power requirement of lithium ion battery energy-accumulating power station in real time
outward, the relevant service data of the battery energy storage power station read comprises: the controllable state value of each battery energy storage subelement, SOC, maximum permission discharge power, maximum permission charge power and rated power in battery energy storage power station.
In stepb, the computational methods of described each battery energy storage subelement initial power bid value are as follows:
First judge the state of current lithium ion battery energy-accumulating power station, and then calculate the initial power bid value of each lithium ion battery energy storage subelement respectively based on corresponding preset rules according to the state of each lithium ion battery energy storage subelement:
1) when lithium ion battery energy-accumulating power station overall power requirement
for on the occasion of time, represent that this energy-accumulating power station will be in discharge condition, then based on state-of-charge (SOC) value and the maximum permission discharge power value of each battery energy storage subelement, calculated the initial power bid value of each battery energy storage subelement by following formula (1)-(8)
2.1 regular A:
When meeting above formula (1), shown in (2), calculate the initial power bid value of each battery energy storage subelement:
2.2 regular B:
When meeting above formula (3), shown in (4), calculate the initial power bid value of each lithium ion battery energy storage subelement:
2.3 regular C:
When meeting above formula (5), first, the minimum energy storage subelement number that can meet formula (7) is calculated based on exclusive method
and compound mode.That is, first calculate based on following formula (6), the current available maximum discharge power characteristic value of each lithium ion battery energy storage subelement i
Then, based on exclusive method, with
order from small to large, gets rid of lithium ion battery energy storage subelement i, one by one until calculate the minimum energy storage subelement number that can meet following formula (7)
till.
Finally, based on following formula (8), calculate
the initial power bid value of individual lithium ion battery energy storage subelement i:
Residue
the initial power bid value of individual lithium ion battery energy storage subelement is all set to 0.
2) when lithium ion battery energy-accumulating power station overall power requirement
during for negative value, represent that this battery energy storage power station will be in charged state, then based on discharge condition (SOD) value and the maximum permission charge power value of each battery energy storage subelement, calculate each battery energy storage subelement initial power bid value by following formula (9)-(17)
2.4 regular D:
When meeting above formula (9), shown in (10), calculate the initial power bid value of each battery energy storage subelement:
2.5 regular E:
When meeting formula (11), as shown in the formula (12)-(13), calculate the initial power bid value of each lithium ion battery energy storage subelement:
SOD
i＝1-SOC
i (13)
2.6 regular F:
When meeting above formula (14), calculate the minimum energy storage subelement number that can meet following formula (16) based on exclusive method
and compound mode.That is, first calculate based on following formula (15), the current available maximum charge power features value of each lithium ion battery energy storage subelement i
Then, based on exclusive method, with
order from small to large, gets rid of lithium ion battery energy storage subelement i, one by one until calculate the energy storage subelement of the minimum number that can meet following formula (16)
till.
Then, based on following formula (17), calculate
the initial power bid value of individual lithium ion battery energy storage subelement i:
Residue
the initial power bid value of individual lithium ion battery energy storage subelement is all set to 0.
3) when battery energy storage power station current total power requirements
when being zero, represent that this battery energy storage power station will be in zero power phase, the initial power bid value of battery energy storage subelement need not be calculated by preset rules, but directly the power command value of all battery energy storage subelements is set to 0.
In formula (1)-(17), u
ifor the controllable state value of i battery energy storage subelement, this state is read by steps A, and when this battery energy storage subelement is controlled, this state value is 1, and other values are 0; SOC
ifor the SOC of i battery energy storage subelement; SOD
ifor the discharge condition value of i battery energy storage subelement; L is total number of lithium ion battery energy storage subelement,
with
be the minimum battery energy storage subelement number satisfied condition;
for the rated power of i lithium ion battery energy storage subelement;
for the maximum permission discharge power of i lithium ion battery energy storage subelement;
for the maximum permission charge power of i lithium ion battery energy storage subelement.
Above-mentioned various in,
for energy-accumulating power station by when being in discharge condition, energy-accumulating power station current total power demand accounts for the ratio of the current controlled energy storage subelement of energy-accumulating power station maximum permission discharge power summation;
for energy-accumulating power station will be in charged state time, energy-accumulating power station current total power demand accounts for the ratio of the current controlled energy storage subelement of energy-accumulating power station maximum permission charge power summation.
In above-mentioned every rule,
1)
with
span can be set as 0.7 to 0.9.With
for good,
2)
with
span can be set as 0.2 to 0.4.With
for good,
3)
with
span can be set as 0.7 to 0.9.With
for good.
In step C, real-time adjustment module revises the initial power bid value of each battery energy storage subelement in real time by following method:
1) when lithium ion battery energy-accumulating power station overall power requirement
for on the occasion of time, represent that this battery energy storage power station will be in discharge condition, then determine each battery energy storage subelement power command value based on following formula (18)-(20):
3.1 Regulation Gs:
When there being the initial power bid value of any one battery energy storage subelement i
when meeting above formula (18), calculate corresponding number N, and by the power command value P of corresponding subelement i
iall limit as shown in the formula (19).
Then, based on following formula (20), recalculate the power command value P of remainder (L-N) individual lithium ion battery energy storage subelement
j:
2) when lithium ion battery energy-accumulating power station overall power requirement
during for negative value, represent that this battery energy storage power station will be in charged state, then determine each battery energy storage subelement power command value based on following formula (21)-(23):
3.2 regular H:
When there being the initial power bid value of any one battery energy storage subelement i
when meeting above formula (21), calculate corresponding number M, and by the power command value P of corresponding subelement i
iall limit as shown in the formula (22).
Then, based on following formula (23), recalculate the power command value P of remainder (L-M) individual lithium ion battery energy storage subelement
j:
Formula (18)-(23), L is total number of lithium ion battery energy storage subelement, N and M is respectively the number of part lithium ion battery energy storage subelement.
Adopt technique scheme, the present invention has online overall power requirement of distributing lithium ion battery energy-accumulating power station, the functions such as real-time monitoring SOC value, thus accurately, convenient, effectively achieve the power dividing function realtime power of lithium ion battery energy-accumulating power station controlled and to lithium ion battery energy storage subelement each in energy-accumulating power station.
If just directly calculate the power command value of each battery energy storage subelement in battery energy storage power station according to battery energy storage power station overall power requirement and each battery energy storage subelement SOC (SOC), then may occur that battery energy storage subelement power command value exceedes it and allows to fill, the situation of discharge power (degree of depth) high-low limit, when there is this overrun condition, as carried out adaptive correction and online process not in time, can Operational capability of plant be exceeded because issuing power command value and cause distributing power error change greatly to each battery energy storage subelement, and existence is difficult to the drawback meeting battery energy storage power station overall power requirement, just owing to invention increases " by first judging the state of battery energy storage power station, the initial power bid value of each battery energy storage subelement in battery energy storage power station is calculated again respectively by corresponding preset rules, effectively (namely consideration can represent the permission charging and discharging capabilities constraints of battery energy storage subelement realtime power characteristic simultaneously, the maximum permission discharge power of each battery energy storage subelement, the constraintss such as the maximum permission charge power of each battery energy storage subelement) in control algolithm and system " etc. step, so not only overcome above-mentioned drawback, also each battery energy storage subelement in battery energy storage power station is created to the effect of better online distribution and monitoring in real time, be more convenient for applying and realizing.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit; in conjunction with above-described embodiment to invention has been detailed description; those of ordinary skill in the field are to be understood that: those skilled in the art still can modify to the specific embodiment of the present invention or equivalent replacement, but these amendments or change are all being applied among the claims awaited the reply.
Claims (8)
1. a megawatt battery energy storage power station real-time power control method, is characterized in that, comprises the following steps:
Steps A, reads the overall power requirement of battery energy storage power station and the relevant service data in this power station in real time, and stores above-mentioned overall power requirement and relevant service data;
Step B, judges the state of battery energy storage power station according to battery energy storage power station overall power requirement, and obtains the initial power bid value of each battery energy storage subelement in battery energy storage power station by corresponding preset rules;
Step C, carries out real-time diagnosis and correction to the initial power bid value of each battery energy storage subelement, to determine the power command value of each battery energy storage subelement;
Step D, exports battery energy storage power station after gathering to the power command value of each battery energy storage subelement;
Described step B specifically comprises:
Judge the state of battery energy storage power station;
When battery energy storage power station overall power requirement be on the occasion of time, represent that this battery energy storage power station will be in discharge condition, then obtained the initial power bid value of each battery energy storage subelement by the first preset rules;
When battery energy storage power station overall power requirement is negative value, represent that this battery energy storage power station will be in charged state, then obtained the initial power bid value of each battery energy storage subelement by the second preset rules;
When battery energy storage power station overall power requirement is zero, represent that this battery energy storage power station will be in zero power phase, then the direct power command value by all battery energy storage subelements is set to zero;
Described first preset rules comprises:
1) ratio value accounting for each controlled battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation when the overall power requirement of battery energy storage power station is more than or equal to preset value
time, then the initial power bid value of each battery energy storage subelement is the product of aforementioned proportion value and the maximum permission discharge power of corresponding controlled battery energy storage subelement;
2) ratio value accounting for each controlled battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation when the overall power requirement of battery energy storage power station is greater than preset value
and be less than
time, then the initial power bid value of each battery energy storage subelement be the SOC of corresponding controlled battery energy storage subelement account for current all controlled battery energy storage subelement SOC summations ratio value, be multiplied by battery energy storage power station overall power requirement again;
3) ratio value accounting for each controlled battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation when the overall power requirement of battery energy storage power station is less than or equal to preset value
time,
First, the current available maximum discharge power characteristic value of each battery energy storage subelement is calculated;
Then, the order ascending according to maximum discharge power characteristic value sorts to each battery energy storage subelement, and the ratio value accounting for the current all controlled battery energy storage subelements of this energy-accumulating power station maximum permission discharge power summation with battery energy storage power station current total power demand is more than or equal to preset value
for condition, exclusive method is adopted to calculate the minimum number battery energy storage subelement meeting above-mentioned condition;
Finally, the initial power bid value of above-mentioned minimum number battery energy storage subelement be the SOC of corresponding controlled battery energy storage subelement account for current minimum number controlled battery energy storage subelement SOC summation ratio value, be multiplied by battery energy storage power station current total power demand again; The initial power bid value of all the other battery energy storage subelements is all set to 0;
Described second preset rules comprises:
1) when the overall power requirement of battery energy storage power station
the ratio value accounting for each controlled battery energy storage subelement of this energy-accumulating power station maximum permission charge power summation is more than or equal to preset value
time, then the initial power bid value of each battery energy storage subelement is the product of aforementioned proportion value and the maximum permission charge power of corresponding controlled battery energy storage subelement;
2) ratio value accounting for each controlled battery energy storage subelement of this energy-accumulating power station maximum permission charge power summation when the overall power requirement of battery energy storage power station is greater than preset value
and be less than
time, then the initial power bid value of each battery energy storage subelement be the discharge condition value of corresponding controlled battery energy storage subelement account for each controlled battery energy storage subelement discharge condition value summation ratio value, be multiplied by battery energy storage power station current total power demand again;
3) ratio value accounting for each controlled battery energy storage subelement of this energy-accumulating power station maximum permission charge power summation when the overall power requirement of battery energy storage power station is less than or equal to preset value
time,
First, the current available maximum charge power features value of each battery energy storage subelement is calculated;
Then, be worth ascending order according to maximum charge power features to sort to each battery energy storage subelement, the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation with battery energy storage power station current total power demand is more than or equal to preset value
for condition, exclusive method is adopted to calculate the minimum number battery energy storage subelement meeting above-mentioned condition;
Finally, the initial power bid value of above-mentioned minimum number battery energy storage subelement be the discharge condition value of corresponding controlled battery energy storage subelement account for current minimum number controlled battery energy storage subelement discharge condition value summation ratio value, be multiplied by battery energy storage power station current total power demand again; The initial power bid value of all the other battery energy storage subelements is all set to 0;
The discharge condition value of described battery energy storage subelement equals the SOC that 1 deducts this battery energy storage subelement; The controllable state value that described controlled battery energy storage subelement maximum permission discharge power, controlled battery energy storage subelement maximum permission charge power, controlled battery energy storage subelement SOC and controlled battery energy storage subelement discharge condition value equal battery energy storage subelement respectively with the product of the maximum permission discharge power of this battery energy storage subelement, maximum permission charge power, SOC and discharge condition value; When battery energy storage subelement is controlled, the controllable state value of this battery energy storage subelement is 1; Otherwise value is 0.
2. control method as claimed in claim 1, it is characterized in that, in step, the relevant service data of described battery energy storage power station comprises: the controllable state value of each battery energy storage subelement, SOC, maximum permission discharge power, maximum permission charge power and rated power in battery energy storage power station.
3. control method as claimed in claim 1, is characterized in that, described in
with
span be 0.7 ~ 0.9, described in
with
span be 0.2 ~ 0.4, described in
with
span be 0.7 ~ 0.9.
4. control method as claimed in claim 1, it is characterized in that, described step C specifically comprises:
Real-time diagnosis is carried out to the initial power bid value of each battery energy storage subelement that step B calculates, see if there is the situation violating each battery energy storage subelement maximum permission discharge power and the restriction of maximum permission charge power to occur, if had, then on-line amending carried out to each battery energy storage subelement and calculate again; As not having, then the initial power bid value of each battery energy storage subelement calculated by step B is set to its power command value.
5. control method as claimed in claim 4, it is characterized in that, described on-line amending and the method calculated again specifically comprise:
When battery energy storage power station overall power requirement be on the occasion of time, if when the initial power bid value that any battery energy storage subelement occurs violates the situation of this battery energy storage subelement maximum permission discharge power, then search the battery energy storage subelement number meeting above-mentioned situation, and the maximum permission discharge power of these battery energy storage subelements is set as its power command value, the power command value of remaining each battery energy storage subelement is the ratio value that remaining controlled battery energy storage subelement maximum permission discharge power accounts for all controlled battery energy storage subelement maximum permission discharge power summations of current remainder, be multiplied by battery energy storage power station current total power demand and the difference of each battery energy storage subelement maximum permission discharge power summation meeting above-mentioned situation again,
When battery energy storage power station overall power requirement is negative value, if when the initial power bid value that any battery energy storage subelement occurs violates the situation of this battery energy storage subelement maximum permission charge power limit value, then search the battery energy storage subelement number meeting above-mentioned situation, and the maximum permission charge power of these battery energy storage subelements is set as its power command value, the power command value of remaining each battery energy storage subelement is the ratio value that remaining controlled battery energy storage subelement maximum permission charge power accounts for remaining all controlled battery energy storage subelement maximum permission charge power summations, be multiplied by battery energy storage power station current total power demand and the difference of each battery energy storage subelement maximum permission charge power summation meeting above-mentioned situation again.
6. a megawatt battery energy storage power station real-time power control system, is characterized in that, this system comprises:
Communication module, for the relevant service data of the real-time overall power requirement He this power station that read battery energy storage power station in real time, and exports the power command value of each battery energy storage subelement to battery energy storage power station;
Data storage and management module, for the real-time overall power requirement of store and management and relevant service data, and the power command value of each battery energy storage subelement that real-time adjustment module is returned gather after reach communication module and export;
Gross power original allocation control module, for judging according to battery energy storage power station overall power requirement the state that battery energy storage power station will be in, and calculates the initial power bid value of each battery energy storage subelement by corresponding preset rules; With
Real-time adjustment module, for carrying out real-time diagnosis and correction to the initial power bid value of each battery energy storage subelement, to determine the power command value of each battery energy storage subelement;
Described gross power original allocation control module comprises:
Judge module, for judging the state of battery energy storage power station: when battery energy storage power station current total power demand as on the occasion of time, represent that this battery energy storage power station will be in discharge condition, then calculated the initial power bid value of each battery energy storage subelement by the first Executive Module; When battery energy storage power station current total power demand is negative value, represent that this battery energy storage power station will be in charged state, then calculated the initial power bid value of each battery energy storage subelement by the second Executive Module; When the current total power requirements of battery energy storage power station is zero, represent that this battery energy storage power station will be in zero power phase, then the power command value of each battery energy storage unit is directly set by the 3rd Executive Module;
First Executive Module, for when battery energy storage power station will be in discharge condition, will calculate the initial power bid value of each battery energy storage subelement;
Second Executive Module, for when battery energy storage power station will be in charged state, will calculate the initial power bid value of each battery energy storage subelement; With
3rd Executive Module, for being directly set to zero by the power command value of all battery energy storage subelements;
Described first Executive Module comprises:
First performs subelement I, is more than or equal to for the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation when battery energy storage power station current total power demand
time, calculate the initial power bid value of each battery energy storage subelement;
First performs subelement II, is greater than for the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation when battery energy storage power station current total power demand
and be less than
time, calculate the initial power bid value of each battery energy storage subelement; With
First performs subelement III, is less than or equal to for the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation when battery energy storage power station current total power demand
time,
First, the current available maximum discharge power characteristic value of each battery energy storage subelement is calculated;
Then, the order ascending according to maximum discharge power characteristic value sorts to each battery energy storage subelement, and the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission discharge power summation with battery energy storage power station current total power demand is more than or equal to
for condition, exclusive method is adopted to calculate minimum number battery energy storage subelement;
Finally, recalculate the initial power bid value of minimum number battery energy storage subelement, the initial power bid value of all the other battery energy storage subelements is all set to 0;
Described second Executive Module comprises:
Second performs subelement I, is more than or equal to for the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission charge power summation when battery energy storage power station current total power demand
time, calculate the initial power bid value of each battery energy storage subelement;
Second performs subelement II, is greater than for the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission charge power summation when battery energy storage power station current total power demand
and be less than
time, calculate the initial power bid value of each battery energy storage subelement; With
Second performs subelement III, is less than or equal to for the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission charge power summation when battery energy storage power station current total power demand
time,
First, the current available maximum charge power features value of each battery energy storage subelement is calculated;
Then, be worth ascending order according to maximum charge power features to sort to each battery energy storage subelement, the ratio value accounting for the current each controlled battery energy storage subelement of this energy-accumulating power station maximum permission charge power summation with battery energy storage power station current total power demand is more than or equal to
for condition, exclusive method is adopted to calculate minimum number battery energy storage subelement;
Finally, recalculate the initial power bid value of minimum number battery energy storage subelement, the initial power bid value of all the other battery energy storage subelements is all set to 0.
7. control system as claimed in claim 6, it is characterized in that, described real-time adjustment module comprises:
Real-time diagnosis unit, for carrying out real-time diagnosis to the initial power bid value of each battery energy storage subelement, seeing if there is the situation violating each battery energy storage subelement maximum permission discharge power and the restriction of maximum permission charge power and occurring; With
Computing unit, for the diagnostic result according to real-time diagnosis unit, carries out on-line amending and calculates or directly the initial power bid value of respective battery energy storage subelement be set to its power command value.
8. control system as claimed in claim 7, it is characterized in that, described computing unit comprises:
First computation subunit, for when battery energy storage power station will be in discharge condition, if when the initial command value that any battery energy storage subelement occurs is greater than the situation of its maximum permission discharge power, then search the battery energy storage subelement number meeting above-mentioned situation, and the maximum permission discharge power of these battery energy storage subelements is set as its power command value, the power command value of remaining each battery energy storage subelement recalculates;
Second computation subunit, for when battery energy storage power station will be in charged state, if when the initial command value that any battery energy storage subelement occurs violates the situation of its maximum permission charge power restriction, then search the battery energy storage subelement number meeting above-mentioned situation, and the maximum permission charge power of these battery energy storage subelements is set as its power command value, the power command value of remaining each battery energy storage subelement recalculates; With
3rd computation subunit, for being set to its power command value by the initial power bid value of respective battery energy storage subelement.
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| CN103532132A (en) * | 2013-09-23 | 2014-01-22 | 国家电网公司 | Control method of self-adaptive mobile microgrid energy interaction system |
| CN104753076B (en) * | 2013-12-31 | 2017-08-22 | 比亚迪股份有限公司 | Battery energy storage system and its control method for peak load shifting |
| CN104348177A (en) * | 2014-11-17 | 2015-02-11 | 北京四方继保自动化股份有限公司 | Multi-direct current branch power coordinated control method based on back-to-back type energy storage converter |
| CN105870973B (en) * | 2016-06-16 | 2018-05-04 | 东北电力大学 | A kind of energy-storage system tackles high wind-powered electricity generation permeability system frequency modulation demand capacity collocation method |
| CN106684913B (en) * | 2016-12-29 | 2023-05-23 | 中国电力科学研究院 | Multi-agent-based energy storage power station tracking power generation plan control system and method |
| CN108336766A (en) * | 2018-02-13 | 2018-07-27 | 中国电力科学研究院有限公司 | A kind of energy-storage system multiple agent cooperative control method and device |
| CN109617103B (en) * | 2018-11-30 | 2022-09-02 | 中国电力科学研究院有限公司 | Energy control method and system for gradient utilization energy storage battery of energy storage unit |
| CN109800528B (en) * | 2019-01-30 | 2023-05-09 | 辽宁东科电力有限公司 | Mathematical model modeling method based on overload characteristic of all-vanadium redox flow battery |
| CN109910669B (en) * | 2019-04-29 | 2021-01-15 | 恒大智慧充电科技有限公司 | Charging regulation and control method, computer equipment and storage medium |
| CN113141038B (en) * | 2021-04-23 | 2024-08-02 | 东莞莞能绿色能源服务有限公司 | Energy storage control method, device and system |
| CN113629816B (en) * | 2021-09-01 | 2024-05-03 | 国网江苏省电力有限公司电力科学研究院 | Method and device for distributing charge and discharge power of energy storage group |
| CN113690918B (en) * | 2021-09-14 | 2023-04-07 | 华北电力大学（保定） | Centralized battery energy storage power station frequency modulation control strategy based on dynamic grouping technology |
| CN114069679B (en) * | 2021-11-26 | 2023-07-14 | 国网湖南省电力有限公司 | Multiplying power control method, system and storage medium for lithium battery energy storage power station |
| CN114221383A (en) * | 2021-12-14 | 2022-03-22 | 阳光新能源开发股份有限公司 | New energy power station and control method and device thereof |
| CN116565267B (en) * | 2023-03-13 | 2023-10-03 | 陕西合全建设工程有限公司 | Large-scale all-vanadium redox flow energy storage battery system |
| CN116505623B (en) * | 2023-06-27 | 2023-12-26 | 广州汇电云联数科能源有限公司 | Method, device, equipment and storage medium for distributing discharge power of energy storage power station |
| CN117060553B (en) * | 2023-10-13 | 2024-01-02 | 快电动力(北京)新能源科技有限公司 | Battery management method, device, system and component of energy storage system |
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