CN114094611A - Energy storage power station power instruction distribution method and system considering SOC consistency - Google Patents
Energy storage power station power instruction distribution method and system considering SOC consistency Download PDFInfo
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
Abstract
The invention discloses an energy storage power station power instruction distribution method and system considering SOC consistency, wherein the method comprises the following steps: if the primary frequency modulation instruction and the AGC power regulation control instruction exceed the available power of the total station, correcting the values of the primary frequency modulation instruction and the AGC power regulation control instruction into the available power of the total station; otherwise, obtaining a difference value between the current SOC value of the battery stack corresponding to each PCS of the energy storage station and a preset target SOC value, and determining a charging/discharging power instruction distributed by each PCS based on the primary frequency modulation instruction, the AGC power regulation control instruction and the difference value. The invention aims to realize further refined control on the SOC of the battery, realize that the batteries with different initial SOCs realize convergent adjustment of the SOC by participating in daily charging and discharging, further improve the SOC consistency of the batteries, and simultaneously carry out SOC adjustment for meeting the peak load regulation and valley fill requirements of a full-capability response power grid.
Description
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a method and a system for distributing power instructions of an energy storage power station, wherein SOC consistency is taken into consideration.
Background
With the proposal of a novel power system construction strategy, the large-scale development of the energy storage technology becomes a main means for making up the randomness and the volatility of high-proportion new energy power generation in the future, so that the construction of a power grid side energy storage station is greatly developed in recent years. However, along with the accumulation of the running time of the energy storage power station, the control effect of the SOC of the energy storage power station becomes a main influence factor for restricting the power capability of the energy storage power station. Due to unreasonable PCS power distribution logic, different PCS's are unbalanced in calling the energy of the battery, and the battery has a larger separation characteristic in the long term; on the other hand, due to unreasonable power distribution logic, the power distribution of each PCS does not fully consider the state of the SOC of the current cell stack, so that the SOC of each cell stack reaches the upper limit or the lower limit of the cell stack too early, and the full-station function adjusting capacity is limited.
Currently, the more common power command allocation methods are an average allocation type, or a weighted allocation logic that allocates available capacity according to PCS, and considers SOC constraints and available power constraints. However, the above logic is generally insufficient for comprehensive consideration of the state of the battery SOC and the operation state of the energy storage station, and further detailed consideration is not made according to the operation time period of the energy storage station and the SOC control target in combination with the charge and discharge command. For example, the residual bin and the like, a large-scale battery energy storage power station system operation control strategy research [ J ]. power supply and utilization, 2021, 38 (3): 78-83, a proportion distribution and battery state of charge optimization control mode can be adopted in the power mode, wherein the proportion control mode is distributed according to the proportion of the available power of each PCS, the SOC difference of each battery stack cannot be considered, and certain battery stacks easily reach the charge forbidding and release forbidding boundaries prematurely; the SOC optimization control mode is that the maximum chargeable and dischargeable power value and the SOC of the battery stack are comprehensively considered to distribute the power target value of each PCS, the basic idea of the method is that the PCS with high SOC and large available power undertakes more power regulation tasks, compared with a simple available power method, the strategy is relatively more complete, but the performance of the method depends on the determination of a weighted value, and the difference of the control target of the SOC under different charging and discharging modes is not considered. Chinese patent publication No. CN 112103979a discloses a coordination control method for an integrated energy storage system, which mainly considers the optimization of the integrated cost and the longest life of an energy storage battery by establishing a cycle life model of the energy storage battery, but the method has limitations on the power of the battery participating in charging and discharging, cannot realize the full response to the power demand of the power grid, and is not favorable for the energy storage power station to exert the supporting function on the power grid. However, the above methods only perform policy design for calling PCS power from the perspective of the battery body, and fail to fully consider the reserve demand of the energy storage power station participating in peak clipping and valley filling of the power grid for the total battery amount SOC and the control requirement of the SOC balance of each battery stack.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the invention aims to realize further refined control on the SOC of batteries, realize that various battery stacks with different initial SOCs participate in daily charging and discharging to realize convergence regulation of the SOCs, namely further improve the SOC consistency of the battery stacks, and simultaneously carry out the SOC regulation for meeting the peak load regulation and valley load regulation requirements of a full-capability response power grid.
In order to solve the technical problems, the invention adopts the technical scheme that:
a power instruction distribution method of an energy storage power station considering SOC consistency comprises the following steps of generating charge/discharge power instructions distributed by PCS in a peak shaving operation storage interval:
1) acquiring a primary frequency modulation instruction and an AGC power regulation control instruction P;
2) adjusting the primary frequency modulation instruction, the AGC power adjustment control instruction P and the available power P of the total stationabComparing, if the primary frequency modulation instruction and the AGC power regulation control instruction P exceed the available power P of the whole stationabThe values of the primary frequency modulation instruction and the AGC power adjustment control instruction P are corrected to be the available power P of the whole stationab；
3) Obtaining the current SOC value SOC of each PCS corresponding battery stack of the energy storage stationiAnd a preset target SOC value SOCtfDifference value Δ SOC therebetweeniBased on the primary frequency modulation instruction and AGC power regulation control instruction P, difference value delta SOCiThe charge/discharge power command assigned by each PCS is determined.
Optionally, in step 3), based on the primary frequency modulation command, the AGC power adjustment control command P, and the difference Δ SOCiWhen the charging/discharging power instruction distributed by each PCS is determined, if the primary frequency modulation instruction and the AGC power regulation control instruction P are charging instructions, the charging power instruction distributed to any PCS is as follows:
in the above formula, PciCharging power command, Δ SOC, assigned to the PCSiThe current SOC value of the cell stack corresponding to the PCS is defined, n is the number of the PCS, and P is a primary frequency modulation command and an AGC power regulation control command.
Optionally, the step 3) is based on the primary frequency modulation command and the AGC power regulation control command PcDelta value delta SOCiWhen the charging/discharging power instruction distributed by each PCS is determined, if a primary frequency modulation instruction and an AGC power regulation control instruction PcWhen the command is a discharging command, the discharging power command distributed to any PCS is as follows:
in the above formula, PdiDischarge power command, Δ SOC, assigned to the PCSiThe current SOC value of the cell stack corresponding to the PCS is defined, n is the number of the PCS, and P is a primary frequency modulation command and an AGC power regulation control command.
Optionally, the method includes the step of generating a charge/discharge power command allocated by each PCS in the valley-fill operation reserve interval:
s1) acquiring a primary frequency modulation instruction and an AGC power regulation control instruction P;
s2) the primary frequency modulation command, the AGC power regulation control command P and the total station available power PabComparing, if the primary frequency modulation instruction and the AGC power regulation control instruction P exceed the available power P of the whole stationabThe values of the primary frequency modulation instruction and the AGC power adjustment control instruction P are corrected to be the available power P of the whole stationabEnding and exiting; otherwise, skipping to the next step;
s3) obtaining the current SOC value SOC of the battery stack corresponding to each PCS of the energy storage stationiAnd a preset target SOC value SOCtgDifference value Δ SOC therebetweeniBased on the primary frequency modulation command, the AGC power regulation control command P and the difference value delta SOCiAnd determining a charge/discharge power command distributed by each PCS.
Optionally, in step S3), based on the primary frequency modulation command, the AGC power adjustment control command P, and the difference Δ SOCiWhen the charging/discharging power instruction distributed by each PCS is determined, if the primary frequency modulation instruction and the AGC power regulation control instruction P are charging instructions, the charging power instruction distributed to any PCS is as follows:
in the above formula, PciCharging power command, Δ SOC, assigned to the PCSiThe current SOC value of the cell stack corresponding to the PCS is defined, n is the number of the PCS, and P is a primary frequency modulation command and an AGC power regulation control command.
Optionally, the step S3) is based on the primary frequency modulation command and the AGC power adjustment control fingerLet PcDelta value delta SOCiWhen the charging/discharging power instruction distributed by each PCS is determined, if a primary frequency modulation instruction and an AGC power regulation control instruction PcWhen the command is a discharging command, the discharging power command distributed to any PCS is as follows:
in the above formula, PdiDischarge Power instruction, Δ SOC, assigned to the PCSiThe current SOC value of the cell stack corresponding to the PCS is defined, n is the number of the PCS, and P is a primary frequency modulation command and an AGC power regulation control command.
Optionally, step 3) or step S3) is followed by: and respectively comparing the charge/discharge power instruction distributed by each PCS with the maximum available power of the charge/discharge power instruction to obtain an overload PCS with the distributed charge/discharge power instruction exceeding the maximum available power and an insufficient load PCS with the distributed charge/discharge power instruction smaller than the maximum available power, traversing aiming at the overload PCS, respectively calculating the difference value between the charge/discharge power instruction distributed by the current PCS and the maximum available power obtained by traversing to obtain the power difference value delta P of the current PCS, and distributing the power difference value delta P of the current PCS to the insufficient load PCS.
Optionally, the allocating the power difference Δ P of the current PCS to the underloaded PCS means: A1) selecting one insufficient load PCS with the largest difference between the distributed charging/discharging power command and the maximum available power from all the insufficient load PCS to obtain the difference delta P between the charging/discharging power command and the maximum available power distributed by the insufficient load PCSj(ii) a A2) Allocating the power difference value delta P of the current PCS to be not more than the difference value delta PjPartially supplying the insufficient load PCS; A3) according to Δ Δ P ═ Δ P- Δ PjCalculating a remaining power difference value delta P to be distributed, if the remaining power difference value delta P to be distributed is larger than or equal to 0, taking the remaining power difference value delta P to be distributed as a new power difference value delta P of the current PCS, and skipping to the step A1); otherwise, judging that the power difference value delta P of the current PCS is completely distributed.
In addition, the invention also provides an energy storage power station power instruction distribution system considering the SOC consistency, which comprises a microprocessor and a memory which are connected with each other, wherein the microprocessor is programmed or configured to execute the steps of the energy storage power station power instruction distribution method considering the SOC consistency.
Furthermore, the present invention also provides a computer readable storage medium having stored therein a computer program for execution by a computer device to implement the steps of the energy storage plant power instruction distribution method taking into account SOC consistency.
Compared with the prior art, the invention has the following advantages: the invention fully considers the requirements of different running periods of the battery on the SOC control target and the requirements of consistency and balance of each battery stack, and performs total quantity regulation and balance regulation on the SOC in the process of participating in primary frequency modulation and AGC regulation of a power grid by each battery stack, so as to make battery SOC reserve in advance for meeting the continuous power output of peak regulation and valley filling. The method reduces the requirement that special battery SOC maintenance is separately carried out on each battery stack to meet the maximum available power when the energy storage power station participates in peak shaving and valley filling of the power grid, can effectively widen the time interval of the energy storage power station participating in primary frequency modulation and AGC (automatic gain control) adjustment of the power grid, and simultaneously improves the consistency of each battery stack.
Drawings
FIG. 1 is a schematic flow chart of the method of the embodiment of the invention.
Detailed Description
Referring to fig. 1, the energy storage power station power instruction allocation method considering SOC consistency in the present embodiment includes the step of generating charge/discharge power instructions allocated by each PCS in a peak shaving operation reserve interval:
1) acquiring a primary frequency modulation instruction and an AGC power regulation control instruction P;
2) adjusting the primary frequency modulation instruction, the AGC power adjustment control instruction P and the available power P of the total stationabComparing, if the primary frequency modulation instruction and the AGC power regulation control instruction P exceed the available power P of the whole stationabThe values of the primary frequency modulation instruction and the AGC power adjustment control instruction P are corrected to be the available power P of the whole stationab；
3) Acquiring corresponding battery of each PCS of energy storage stationCurrent SOC value SOC of stackiAnd a preset target SOC value SOCtfDifference value Δ SOC therebetweeniBased on the primary frequency modulation command, the AGC power regulation control command P and the difference value delta SOCiThe charge/discharge power command assigned by each PCS is determined.
It should be noted that, in the flowchart in fig. 1, the current SOC value SOC of the cell stack corresponding to each PCS of the energy storage station is to be obtainediAnd a preset target SOC value SOCtfDifference value Δ SOC therebetweeniPreprocessing, but in practice, the result is only needed in step 3), so preprocessing can be selected or embedded in step 3) as needed.
Referring to fig. 1, in step 3) of this embodiment, the primary frequency modulation command, the AGC power adjustment control command P, and the difference Δ SOC are based oniWhen the charging/discharging power instruction distributed by each PCS is determined, if the primary frequency modulation instruction and the AGC power regulation control instruction P are charging instructions, the charging power instruction distributed to any PCS is as follows:
in the above formula, PciCharging power command, Δ SOC, assigned to the PCSiThe current SOC value of the cell stack corresponding to the PCS is defined, n is the number of the PCS, and P is a primary frequency modulation command and an AGC power regulation control command.
Referring to fig. 1, in step 3) of this embodiment, the control command P is adjusted based on the primary frequency modulation command and the AGC powercDelta value delta SOCiWhen the charging/discharging power instruction distributed by each PCS is determined, if a primary frequency modulation instruction and an AGC power regulation control instruction PcWhen the command is a discharging command, the discharging power command distributed to any PCS is as follows:
in the above formula, PdiDischarge power command, Δ SOC, assigned to the PCSiCorresponds to the current S of the cell stack for this PCSOC value, n is the number of PCS, and P is primary frequency modulation command and AGC power regulation control command.
Referring to fig. 1, the present embodiment further includes a step of generating a charge/discharge power command allocated by each PCS in the valley fill operation reserve interval:
s1) acquiring a primary frequency modulation command and an AGC power regulation control command P;
s2) the primary frequency modulation command, the AGC power regulation control command P and the total station available power PabComparing, if the primary frequency modulation instruction and the AGC power regulation control instruction P exceed the available power P of the whole stationabThe values of the primary frequency modulation instruction and the AGC power adjustment control instruction P are corrected to be the available power P of the whole stationabEnding and exiting; otherwise, skipping to the next step;
s3) obtaining the current SOC value SOC of the battery stack corresponding to each PCS of the energy storage stationiAnd a preset target SOC value SOCtgDifference value Δ SOC therebetweeniBased on the primary frequency modulation instruction and AGC power regulation control instruction P, difference value delta SOCiThe charge/discharge power command assigned by each PCS is determined.
Referring to fig. 1, in step S3), the present embodiment adjusts the control command P and the difference Δ SOC based on the primary frequency modulation command, the AGC power, and the AGC poweriWhen the charging/discharging power instruction distributed by each PCS is determined, if the primary frequency modulation instruction and the AGC power regulation control instruction P are charging instructions, the charging power instruction distributed to any PCS is as follows:
in the above formula, PciCharging power command, Δ SOC, assigned to the PCSiThe current SOC value of the cell stack corresponding to the PCS is defined, n is the number of the PCS, and P is a primary frequency modulation command and an AGC power regulation control command.
Referring to fig. 1, in step S3), the present embodiment adjusts the control command P based on the primary frequency modulation command and the AGC powercDifference value Δ SOCiWhen the charging/discharging power instruction distributed by each PCS is determined, if a primary frequency modulation instruction and an AGC power regulation control instruction PcTo put inIn the case of an electrical command, the discharge power command allocated to any PCS is:
in the above formula, PdiDischarge power command, Δ SOC, assigned to the PCSiThe current SOC value of the cell stack corresponding to the PCS is defined, n is the number of the PCS, and P is a primary frequency modulation command and an AGC power regulation control command.
Referring to fig. 1, the method of the present embodiment divides the operation time zone of the energy storage power station into a peak shaving operation reserve interval (the time interval between the last peak shaving operation and the next peak shaving operation) and a valley shaving operation reserve interval (the time interval between the last peak shaving operation and the next valley shaving operation); SOC control target SOC for setting peak-shaving operation reserve intervaltfSetting SOC control target SOC of valley filling operation storage intervaltg(ii) a Obtaining the current SOC value of each cell stack corresponding to each PCS of the energy storage station, and recording the current SOC value as the SOCiGenerally, there is SOCtg<SOCi<SOCtf(ii) a Obtaining the current SOC value SOC of each PCS corresponding battery stack of the energy storage stationiAnd a preset target SOC value SOCtfDifference value Δ SOC therebetweeniIt can be expressed as: delta SOCi＝SOCtf-SOCi(ii) a Obtaining the current SOC value SOC of each PCS corresponding battery stack of the energy storage stationiAnd a preset target SOC value SOCtgDifference value Δ SOC therebetweeniIt can be expressed as: delta SOCi＝SOCi-SOCtg(ii) a The obtained primary frequency modulation instruction, AGC control instruction P and total station available power PabComparing, if the primary frequency modulation instruction and the AGC control instruction P do not exceed the available power P of the whole stationabThen it is inconvenient to maintain the current power command; if the primary frequency modulation instruction and the AGC control instruction P exceed the available power P of the whole stationabIf the total station available power P is not equal to the total station available power P, the primary frequency modulation instruction and the AGC control instruction P are corrected to be the total station available power Pab. The power distribution logic described above may then be executed according to the operating section in which the energy storage power plant is located.
The power allocation command also needs to consider the current available power constraint of each PCS, that is, when the power allocated according to the SOC exceeds the current available power, the power command of the PCS is the available maximum power, at this time, the insufficient power is borne by the remaining available power in the other PCS with the maximum power, until the power response of all PCS meets the total primary frequency modulation or AGC power command. Referring to fig. 1, the present embodiment further includes, after step 3) or step S3): and respectively comparing the charge/discharge power instruction distributed by each PCS with the maximum available power of the charge/discharge power instruction to obtain an overload PCS with the distributed charge/discharge power instruction exceeding the maximum available power and an insufficient load PCS with the distributed charge/discharge power instruction smaller than the maximum available power, traversing aiming at the overload PCS, respectively calculating the difference value between the charge/discharge power instruction distributed by the current PCS and the maximum available power obtained by traversing to obtain the power difference value delta P of the current PCS, and distributing the power difference value delta P of the current PCS to the insufficient load PCS.
Referring to fig. 1, the allocating the power difference Δ P of the current PCS to the insufficient load PCS in this embodiment means: A1) selecting one insufficient load PCS with the largest difference between the distributed charging/discharging power command and the maximum available power from all the insufficient load PCS to obtain the difference delta P between the charging/discharging power command and the maximum available power distributed by the insufficient load PCSj(ii) a A2) Allocating the power difference value delta P of the current PCS to be not more than the difference value delta PjPartially supplying the underload PCS; A3) according to Δ Δ P ═ Δ P- Δ PjCalculating a remaining power difference value delta P to be distributed, if the remaining power difference value delta P to be distributed is larger than or equal to 0, taking the remaining power difference value delta P to be distributed as a new power difference value delta P of the current PCS, and skipping to the step A1); otherwise, judging that the power difference value delta P of the current PCS is completely distributed.
In this embodiment, three PCS exist in a certain energy storage station, which is currently in a peak shaving reserve operation area, and the SOC peak shaving target SOCtf is set to 90%. As shown in table 1, there are 3 PCS and corresponding battery energy storage units, each PCS has maximum chargeable/dischargeable power, and the SOC of each battery energy storage unit is different. And the power under AGC is output 100kW, and the power distribution to PCS under different algorithms is calculated.
Table 1: and energy storage control parameters.
Differences between the PCS and the target SOC are respectively 30%, 40% and 50%. According to the distribution strategy of the method of the embodiment, the absorbed power is 100kW, the charging power of PCS1 is Pc 1-0.3/1.2-100-25 kW; the charging power of the PCS2 is Pc2 ═ 0.4/1.2 × 100 ═ 33.33 kW; the charging power of the PCS3 is Pc3 ═ 0.5/1.2 × 100 ═ 41.66 kW. At present, the stack battery capacities of the PCS batteries are 60kWh, 50kWh, and 40kWh, and the charge amounts of the PCS batteries are changed to 85kWh, 83.33kWh, and 81.66kWh when the PCS batteries are charged for 1 hour in accordance with the current power distribution instruction. If the calculation method of the [ J ] power supply and utilization, 2021, 38 (3): 78-83 ] is studied according to the operation control strategy of the large-scale battery energy storage power station system in the prior art (residual bin and the like), the power value of each PCS is 35.29kW, 35.29kW and 29.42kW respectively. After charging for 1 hour, the electric quantity of each PCS corresponding to the cell stack is 95.29kWh, 85.29kWh and 69.42 kWh. It can be seen that, as time goes by, according to the calculation method of the prior art(s) (extra bin, etc.) of the large battery energy storage power station system operation control strategy research [ J ]. power supply and utilization, 2021, 38 (3): 78-83.), the PCS1 will quickly reach its SOC upper limit, thereby failing to provide charging power capacity, the power of the whole station will be limited first, and at the same time, the SOC of the PCS will be greatly different from the SOC of PCS1 and PCS 2.
In addition, the present embodiment further provides an energy storage power station power instruction distribution system considering SOC consistency, which includes a microprocessor and a memory connected to each other, where the microprocessor is programmed or configured to execute the steps of the energy storage power station power instruction distribution method considering SOC consistency. Furthermore, the present embodiment also provides a computer-readable storage medium having stored therein a computer program for execution by a computer device to implement the steps of the aforementioned energy storage plant power instruction distribution method taking into account SOC consistency.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A power instruction distribution method of an energy storage power station considering SOC consistency is characterized by comprising the following steps of generating charge/discharge power instructions distributed by PCS in a peak shaving operation storage interval:
1) acquiring a primary frequency modulation instruction and an AGC power regulation control instruction P;
2) adjusting a primary frequency modulation instruction, an AGC power adjustment control instruction P and total station available power PabComparing, if the primary frequency modulation instruction and the AGC power regulation control instruction P exceed the available power P of the whole stationabThe values of the primary frequency modulation instruction and the AGC power adjustment control instruction P are corrected to be the available power P of the whole stationab；
3) Obtaining the current SOC value SOC of each PCS corresponding battery stack of the energy storage stationiAnd a preset target SOC value SOCtfDifference value Δ SOC therebetweeniBased on the primary frequency modulation instruction and AGC power regulation control instruction P, difference value delta SOCiThe charge/discharge power command assigned by each PCS is determined.
2. The energy storage power station power instruction distribution method considering SOC consistency according to claim 1, characterized in that in step 3) based on primary frequency modulation instruction, AGC power adjustment control instruction P, difference Δ SOCiWhen the charging/discharging power instruction distributed by each PCS is determined, if a primary frequency modulation instruction and an AGC power adjustment control instruction P are charging instructions, the charging power instruction distributed to any PCS is as follows:
in the above formula, PciCharging power command, Δ SOC, assigned to the PCSiThe current SOC value of the cell stack corresponding to the PCS is defined, n is the number of the PCS, and P is a primary frequency modulation command and an AGC power regulation control command.
3. The method for distributing power instructions of energy storage power stations in consideration of SOC consistency according to claim 2, wherein the step 3) is based on a primary frequency modulation instruction and an AGC power regulation control instruction PcDelta value delta SOCiWhen the charging/discharging power instruction distributed by each PCS is determined, if a primary frequency modulation instruction and an AGC power regulation control instruction PcWhen the command is a discharging command, the discharging power command distributed to any PCS is as follows:
in the above formula, PdiDischarge power command, Δ SOC, assigned to the PCSiThe current SOC value of the cell stack corresponding to the PCS is defined, n is the number of the PCS, and P is a primary frequency modulation command and an AGC power regulation control command.
4. The energy storage power station power instruction allocation method taking into account SOC consistency according to claim 3, characterized by further comprising the step of generating charge/discharge power instructions for each PCS allocation in a valley fill operation reserve interval:
s1) acquiring a primary frequency modulation instruction and an AGC power regulation control instruction P;
s2) the primary frequency modulation command, the AGC power regulation control command P and the total station available power PabComparing, if the primary frequency modulation instruction and the AGC power regulation control instruction P exceed the available power P of the whole stationabThe values of the primary frequency modulation instruction and the AGC power adjustment control instruction P are corrected to be the available power P of the whole stationabEnding and exiting; otherwise, skipping to the next step;
s3) obtaining the current SOC value SOC of the battery stack corresponding to each PCS of the energy storage stationiAnd a preset target SOC value SOCtgDifference value Δ SOC therebetweeniBased on the primary frequency modulation command, the AGC power regulation control command P and the difference value delta SOCiThe charge/discharge power command assigned by each PCS is determined.
5. The method for distributing power instructions of energy storage power stations in consideration of SOC uniformity as claimed in claim 4, wherein in step S3), based on primary frequency modulation instruction, AGC power regulation control instruction P, and difference value Δ SOCiWhen the charging/discharging power instruction distributed by each PCS is determined, if a primary frequency modulation instruction and an AGC power adjustment control instruction P are charging instructions, the charging power instruction distributed to any PCS is as follows:
in the above formula, PciCharging power command, Δ SOC, assigned to the PCSiThe current SOC value of the cell stack corresponding to the PCS is defined, n is the number of the PCS, and P is a primary frequency modulation command and an AGC power regulation control command.
6. The method for distributing power commands of energy storage plants based on SOC consistence of claim 5, wherein in step S3), the power command P is adjusted based on primary frequency modulation command and AGC powercDelta value delta SOCiWhen the charging/discharging power instruction distributed by each PCS is determined, if a primary frequency modulation instruction and an AGC power regulation control instruction PcWhen the command is a discharging command, the discharging power command distributed to any PCS is as follows:
in the above formula, PdiDischarge Power instruction, Δ SOC, assigned to the PCSiIs the current SOC value of the cell stack corresponding to the PCS, n is the number of PCS, and P is oneSecondary frequency modulation instruction and AGC power regulation control instruction.
7. The energy storage power station power instruction distribution method considering SOC uniformity as recited in claim 6, further comprising after step 3) or step S3): and respectively comparing the charge/discharge power instruction distributed by each PCS with the maximum available power of the charge/discharge power instruction to obtain an overload PCS with the distributed charge/discharge power instruction exceeding the maximum available power and an insufficient load PCS with the distributed charge/discharge power instruction smaller than the maximum available power, traversing aiming at the overload PCS, respectively calculating the difference value between the charge/discharge power instruction distributed by the current PCS and the maximum available power obtained by traversing to obtain the power difference value delta P of the current PCS, and distributing the power difference value delta P of the current PCS to the insufficient load PCS.
8. The energy storage power station power instruction distribution method considering SOC uniformity as claimed in claim 7, wherein said distributing the power difference value Δ P of the current PCS to the underloaded PCS means: A1) selecting one underload PCS with the largest difference between the allocated charging/discharging power command and the maximum available power from all the underload PCS to obtain the difference delta P between the charging/discharging power command and the maximum available power allocated by the underload PCSj(ii) a A2) Allocating the power difference value delta P of the current PCS to be not more than the difference value delta PjPartially supplying the underload PCS; A3) according to Δ Δ P ═ Δ P- Δ PjCalculating a remaining power difference value delta P to be distributed, if the remaining power difference value delta P to be distributed is larger than or equal to 0, taking the remaining power difference value delta P to be distributed as a new power difference value delta P of the current PCS, and skipping to the step A1); otherwise, judging that the power difference value delta P of the current PCS is completely distributed.
9. An energy storage power station power instruction distribution system considering SOC consistency, which comprises a microprocessor and a memory which are connected with each other, and is characterized in that the microprocessor is programmed or configured to execute the steps of the energy storage power station power instruction distribution method considering SOC consistency in any one of claims 1-8.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored therein a computer program for execution by a computer device to implement the steps of the energy storage plant power instruction distribution method taking into account SOC consistency of any of claims 1-8.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115276068A (en) * | 2022-09-29 | 2022-11-01 | 湖南华大电工高科技有限公司 | Large-scale energy storage power station power cooperative control method considering economy and safety |
| CN115800342A (en) * | 2022-11-04 | 2023-03-14 | 力高(山东)新能源技术股份有限公司 | Energy storage power station AGC active power distribution method based on power distribution factors |
| CN116505623A (en) * | 2023-06-27 | 2023-07-28 | 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 |
| CN116760155A (en) * | 2023-08-18 | 2023-09-15 | 合肥国轩高科动力能源有限公司 | Charge and discharge control method and device, storage medium and electronic equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102867977A (en) * | 2011-07-05 | 2013-01-09 | 中国科学院大连化学物理研究所 | All-vanadium redox flow energy storage battery system and subsystem power consistency adjustment method thereof |
| CN103187733A (en) * | 2011-12-31 | 2013-07-03 | 中国电力科学研究院 | Megawatt liquid flow battery energy storage power station real-time power control method and system thereof |
| CN106451505A (en) * | 2016-10-21 | 2017-02-22 | 许继集团有限公司 | Output regulation method and device for distributed energy storage system |
| CN109212420A (en) * | 2018-09-11 | 2019-01-15 | 深圳市科陆电子科技股份有限公司 | SOC modification method based on AGC frequency modulation energy-storage system |
| CN111756058A (en) * | 2019-03-29 | 2020-10-09 | 比亚迪股份有限公司 | Energy storage system charge-discharge power distribution method |
| CN113541174A (en) * | 2021-07-08 | 2021-10-22 | 国网湖南省电力有限公司 | Energy storage AGC PCS active power distribution method and system considering SOC sequencing |
-
2021
- 2021-11-23 CN CN202111397766.4A patent/CN114094611B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102867977A (en) * | 2011-07-05 | 2013-01-09 | 中国科学院大连化学物理研究所 | All-vanadium redox flow energy storage battery system and subsystem power consistency adjustment method thereof |
| CN103187733A (en) * | 2011-12-31 | 2013-07-03 | 中国电力科学研究院 | Megawatt liquid flow battery energy storage power station real-time power control method and system thereof |
| CN106451505A (en) * | 2016-10-21 | 2017-02-22 | 许继集团有限公司 | Output regulation method and device for distributed energy storage system |
| CN109212420A (en) * | 2018-09-11 | 2019-01-15 | 深圳市科陆电子科技股份有限公司 | SOC modification method based on AGC frequency modulation energy-storage system |
| CN111756058A (en) * | 2019-03-29 | 2020-10-09 | 比亚迪股份有限公司 | Energy storage system charge-discharge power distribution method |
| CN113541174A (en) * | 2021-07-08 | 2021-10-22 | 国网湖南省电力有限公司 | Energy storage AGC PCS active power distribution method and system considering SOC sequencing |
Non-Patent Citations (3)
| Title |
|---|
| 孟高军等: "大规模储能电站参与电力系统自动发电控制的协调控制策略优化研究", 《可再生能源》, vol. 39, no. 2, pages 270 - 276 * |
| 李军等: "湖南电网侧电池储能电站概况及调控运行启示", 《湖南电力》, vol. 40, no. 1, pages 73 - 78 * |
| 李勇琦等: "梯次利用电池储能系统集成与控制策略研究", 《电力电子技术》, vol. 55, no. 3, pages 13 - 16 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115276068A (en) * | 2022-09-29 | 2022-11-01 | 湖南华大电工高科技有限公司 | Large-scale energy storage power station power cooperative control method considering economy and safety |
| CN115276068B (en) * | 2022-09-29 | 2022-12-23 | 湖南华大电工高科技有限公司 | Large-scale energy storage power station power cooperative control method considering economy and safety |
| CN115800342A (en) * | 2022-11-04 | 2023-03-14 | 力高(山东)新能源技术股份有限公司 | Energy storage power station AGC active power distribution method based on power distribution factors |
| CN115800342B (en) * | 2022-11-04 | 2023-09-01 | 深圳力高新能技术有限公司 | AGC active power distribution method for energy storage power station based on power distribution factor |
| CN116505623A (en) * | 2023-06-27 | 2023-07-28 | 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 |
| 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 |
| CN116760155A (en) * | 2023-08-18 | 2023-09-15 | 合肥国轩高科动力能源有限公司 | Charge and discharge control method and device, storage medium and electronic equipment |
| CN116760155B (en) * | 2023-08-18 | 2023-11-10 | 合肥国轩高科动力能源有限公司 | Charge and discharge control method and device, storage medium and electronic equipment |
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