CN113541174B - Method and system for distributing PCS active power by energy storage AGC considering SOC sequencing - Google Patents
Method and system for distributing PCS active power by energy storage AGC considering SOC sequencing Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000004146 energy storage Methods 0.000 title claims abstract description 31
- 238000012163 sequencing technique Methods 0.000 title claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000004590 computer program Methods 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 6
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- 238000004422 calculation algorithm Methods 0.000 description 16
- 238000009826 distribution Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 101150003196 PCS1 gene Proteins 0.000 description 7
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- 101100030895 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) RPT4 gene Proteins 0.000 description 7
- 101100028908 Lotus japonicus PCS3 gene Proteins 0.000 description 6
- 101150071172 PCS2 gene Proteins 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 5
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- 101100028900 Caenorhabditis elegans pcs-1 gene Proteins 0.000 description 1
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Classifications
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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
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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Abstract
The invention discloses a method and a system for distributing PCS active power by an energy storage AGC taking SOC sequencing into account, wherein the method comprises the steps of obtaining the SOC value of each PCS corresponding battery; sequencing the SOC values of the batteries, and setting the priority of each PCS according to the sequencing of the SOC values; and sequentially issuing the AGC issued power to each PCS according to the priority of each PCS and combining the maximum chargeable/dischargeable maximum power value of each PCS until the AGC issued power is completely distributed. The invention can meet the requirements of consistency of power charge and discharge and battery and equalization of SOC, and can meet the requirements of consistency of the battery and equalization of the SOC in the charge and discharge process under the condition of meeting power dispatching, reduce non-consistency of the battery and provide the most accurate control information for the power dispatching department.
Description
Technical Field
The invention belongs to the technical field of power systems, and particularly relates to a method and a system for distributing active power of PCS (energy storage converter) by energy storage AGC (automatic gain control) taking SOC (state of charge) sequencing into account.
Background
The large-scale development of electrochemical energy storage puts higher and higher demands on control equipment, AGC is used as an important module for carrying out system control on an energy storage station by EMS, and plays a key role in reasonable distribution of active power and stable operation of the whole station, so that control algorithms of the energy storage station are increasingly paid attention to. At present, the requirements of energy storage AGC for distributing PCS active power are not clear in national standard and industry standard, and each equipment manufacturer respectively provides a power distribution algorithm suitable for the characteristics of the self-product. From the prior art, the conventional power distribution algorithm is relatively simple and is usually biased to meet the requirement of a certain characteristic. For example, algorithms aimed at meeting various PCS power outputs are based on the magnitude of the PCS capability to achieve a proportional distribution of power output, with overall no or less battery aspects such as battery uniformity, battery cell SOC (state of charge). Under normal conditions, the control algorithm can meet the requirements of each power output, but because the characteristics of the battery are not considered, the consistency of the energy storage system after long-term operation/the battery has larger difference, so that the calculation of the SOC and the charge and discharge control interval are affected, and finally, the battery unit cannot be controlled normally. Therefore, a power distribution algorithm is needed to meet the requirements of the power charging and discharging capability of the energy storage power station and the consistency of batteries, ensure the output capability of the energy storage station and enable the energy storage station to safely and stably operate for a long time.
In order to solve the above problems, yu, meng Qingjiang, zhou Weihua, etc. (J. Power supply, 2021, 38 (3): 78-83) (abbreviated as document 1) have analyzed a battery energy storage power station system control strategy, and an AGC operation mode is proposed to be a proportional distribution mode and a battery state of charge (SOC) optimization control mode. The proportion distribution mode, namely, proportion distribution is carried out according to the maximum available power of each PCS which normally operates at present, and the algorithm is shown in the formula (1):
in the above, P i The power value of the ith energy storage converter; p (P) i,max Is the maximum chargeable (discharging) electric power value of the energy storage converter i. The method has the advantages of simple algorithm, and the defects of larger cell unit difference and inaccurate SOC calculation after long-term charge and discharge and possibility of frequently carrying out SOC calibration correction without considering the consistency of the batteries and the equalization of the SOCs. Because the scheduling part gate carries out positive correlation on the SOC and the capacity, the output capacity of the energy storage station is influenced by inaccurate SOC or unavailable energy storage system during calibration.
In the SOC optimization control mode, the power target value of each PCS is allocated by comprehensively considering the maximum chargeable/dischargeable power value and the stack SOC, and the algorithm is shown in equation (2).
In the above, f pi The ratio of the maximum chargeable and dischargeable power value of the ith group to the maximum chargeable and dischargeable power value of all groups; when calculating the charging power target value, f si Is the difference between 100% and the stack SOC percentage value for the i-th group. The method has the advantages that the balance between the charge and discharge power and the SOC is comprehensively considered in a weighted mode, so that the power is limited by the SOC value in the charge and discharge process, and the battery consistency is good finally; the disadvantage is that the weighting values used are not dependent, the meaning of the different weighting values is also ambiguous, and an uncontrolled control of the weighting values may occur when the limiting values are taken. However, the two conventional algorithms cannot well meet the requirements of power charge and discharge, battery consistency and SOC balance.
Disclosure of Invention
The invention aims to solve the technical problems: aiming at the problems in the prior art, the invention provides a method and a system for distributing PCS active power by an energy storage AGC taking into account SOC sequencing, which can meet the requirements of consistency of power charge and discharge and battery and SOC balance, and can meet the requirements of consistency of the battery and balance of the SOC in the charge and discharge process under the condition of meeting power scheduling, reduce non-consistency of the battery and provide the most accurate control information for a power scheduling department.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method of energy storage AGC to allocate PCS active power accounting for SOC ordering, comprising:
1) Acquiring the SOC value of each PCS corresponding battery;
2) Sequencing the SOC values of the batteries, and setting the priority of each PCS according to the sequencing of the SOC values;
3) And sequentially issuing the AGC issued power to each PCS according to the priority of each PCS and combining the maximum chargeable/dischargeable maximum power value of each PCS until the AGC issued power is completely distributed.
Optionally, steps 1) to 3) are based on a preset period t tick And executing at fixed time.
Optionally, the preset period t tick Greater than 0.1 seconds.
Alternatively, the ordering of the SOC values of the batteries in step 2) means ordering in order from large to small.
Optionally, step 3) includes:
3.1 Initializing power to be allocated as AGC total downlink power;
3.2 Traversing and taking out one PCS with the highest priority from each PCS as the current PCS, if the maximum chargeable/amplified maximum power value of the current PCS is smaller than the power to be allocated, taking the maximum chargeable/amplified maximum power value of the current PCS as the AGC (automatic gain control) transmitting power of the current PCS, otherwise, taking the power to be allocated as the AGC transmitting power of the current PCS; subtracting the AGC issued power of the current PCS from the power to be allocated to obtain new power to be allocated;
3.3 Judging whether the new power to be allocated is larger than 0 or not, if so, jumping to execute the step 3.2); otherwise, the AGC down power of each PCS is issued to each PCS.
Optionally, step 3.2) is performed before step 3.3) is performed in a skip mode, and step 3.2) is performed only when each PCS is not performed completely, otherwise, the AGC total issuing power is not matched, and the method is finished and exits.
Optionally, step 3.3) further includes issuing a specified active power conversion rate to each PCS when issuing the AGC issued power of each PCS, so that each PCS switches from the original AGC issued power to a new AGC issued power issued according to the specified active power conversion rate.
Optionally, step 3.3) further includes issuing a specified power adjustment dead zone to each PCS when the AGC issued power of each PCS is issued to each PCS, so that each PCS maintains the existing power unchanged in the specified power adjustment dead zone, and controls according to the power deviation amount exceeding the dead zone after exceeding the specified power adjustment dead zone.
In addition, the invention also provides a system for distributing PCS active power by the energy storage AGC taking the SOC ordering into account, 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 method for distributing PCS active power by the energy storage AGC taking the SOC ordering into account.
The present invention further provides a computer readable storage medium having stored therein a computer program programmed or configured to perform the method of stored energy AGC allocation PCS active power accounting for SOC ordering.
Compared with the prior art, the invention has the following advantages:
the invention can meet the requirements of consistency of power charge and discharge and battery and equalization of SOC, and can meet the requirements of consistency of the battery and equalization of the SOC in the charge and discharge process under the condition of meeting power dispatching, reduce non-consistency of the battery and provide the most accurate control information for the power dispatching department.
In order to solve the technical problems, the invention adopts the following technical scheme: the invention includes obtaining the SOC value of each PCS corresponding to the battery, sequencing the SOC value of the battery, setting the priority of each PCS according to the sequencing of the SOC value, sequentially issuing the AGC issued power to each PCS according to the priority of each PCS in combination with the maximum chargeable/dischargeable maximum power value of each PCS until the AGC issued power is completely distributed.
Drawings
FIG. 1 is a schematic diagram of a core flow chart of a method according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of a complete process of the method according to the embodiment of the invention.
Detailed Description
As shown in fig. 1, the method for distributing PCS active power by the energy storage AGC according to the present embodiment includes:
1) Acquiring the SOC value of each PCS corresponding battery;
2) Sequencing the SOC values of the batteries, and setting the priority of each PCS according to the sequencing of the SOC values;
3) And sequentially issuing the AGC issued power to each PCS according to the priority of each PCS and combining the maximum chargeable/dischargeable maximum power value of each PCS until the AGC issued power is completely distributed.
In this embodiment, steps 1) to 3) are based on a preset period t tick And executing at fixed time. In this embodiment, a timer is specifically used to control the timing execution of steps 1) to 3), the time of the timer is recorded as t, see fig. 2, and after each round of execution of step 3), if the timer time t>Preset period t tick Then proceed back to execute step 1).
Generally, a predetermined period t tick More than 0.1 seconds, and can be specifically set according to the needs.
In this embodiment, the sorting of the SOC values of the batteries in step 2) means sorting in order from large to small.
In this embodiment, step 3) includes:
3.1 Initializing power to be allocated as AGC total downlink power;
3.2 Traversing and taking out one PCS with the highest priority from each PCS as the current PCS, if the maximum chargeable/amplified maximum power value of the current PCS is smaller than the power to be allocated, taking the maximum chargeable/amplified maximum power value of the current PCS as the AGC (automatic gain control) transmitting power of the current PCS, otherwise, taking the power to be allocated as the AGC transmitting power of the current PCS; subtracting the AGC issued power of the current PCS from the power to be allocated to obtain new power to be allocated;
3.3 Judging whether the new power to be allocated is larger than 0 or not, if so, jumping to execute the step 3.2); otherwise, the AGC down power of each PCS is issued to each PCS.
In general, the AGC total delivered power should be a maximum chargeable/dischargeable maximum power value sum that satisfies less than PCS. However, in order to prevent the situation that the AGC total delivery power is abnormal, in this embodiment, step 3.3) further includes a step of determining whether each PCS is traversed, and step 3.2) is performed only when not traversed, otherwise, determining that the AGC total delivery power is not matched, ending and exiting.
In this embodiment, step 3.3) further includes issuing a specified active power conversion rate to each PCS when issuing the AGC issued power of each PCS, so that each PCS switches from the original AGC issued power to the new AGC issued power issued according to the specified active power conversion rate. The present embodiment prevents the adjustment rate from being too fast or too slow by manually setting the active power slew rate in the active power allocation algorithm. The specified active power transfer rate is used to transfer from the present operating power to the new set active power at a certain rate after the PCS receives the new set active power. If the active power conversion rate is too small, the conversion process is slower, which is unfavorable for quick response; if the active power conversion rate is too high, the conversion process is faster, overshoot mutation is easy to cause, and stable control is not facilitated.
In this embodiment, step 3.3) further includes issuing a specified power adjustment dead zone to each PCS when issuing the AGC issued power of each PCS to each PCS, so that each PCS maintains the existing power unchanged in the specified power adjustment dead zone, and controls according to the power deviation amount exceeding the dead zone after exceeding the specified power adjustment dead zone. The present embodiment can prevent the power from being repeatedly adjusted by artificially setting the power adjustment dead zone. After the power adjustment frequency dead zone is set, the existing power can be kept unchanged in the frequency adjustment dead zone, and after the power adjustment frequency dead zone is exceeded, the power is controlled according to the power deviation amount exceeding the dead zone, so that the PCS is ensured not to be frequently adjusted, and the equipment burden is increased.
Referring to fig. 2, the method of the present embodiment includes the following steps: 1. inputting control information, including the number of available PCS, the maximum active power of each PCS chargeable/amplifying, the SOC value of each PCS corresponding battery and AGC regulating power; 2. setting algorithm control parameters including active power conversion rate and power regulation dead zone; 3. sequencing, namely sequencing the SOCs from big to small at regular time, and setting PCS calling priority according to sequencing results of the SOCs; 4. and issuing control quantity, namely calling priority according to PCS, and sequentially issuing each PCS output value by AGC according to each PCS maximum chargeable/dischargeable maximum power value.
Referring to fig. 2, step 3) of the present embodiment further includes setting each PCS output power to zero if a shutdown command is received.
Referring to fig. 2, as a function package of the method for allocating PCS active power by the energy storage AGC taking into account SOC ordering in the present embodiment, a calculation model is established in the present embodiment, and input control information is set to be the number of available PCS (pcs_available_num), the maximum active power of each PCS (pcs_power_max, pcs_power_min), the Battery SOC value (battery_soc) corresponding to each PCS, and the AGC adjustment power (agc_setvalue). Algorithm control parameters are set including active Power conversion rate (power_conversion_rate), power regulation dead zone (power_dead_band_). Each parameter is set as shown in table 1, and 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. The AGC issued power is output 100kW, and the power distribution to PCS under different algorithms is calculated.
Table 1: and (5) energy storage control parameters.
Step 2) sequencing the SOC values of the batteries to obtain the results shown in table 2.
Table 2: SOC value ordering table.
The PCS control priority is set as shown in table 3.
Table 3: PCS prioritized table.
And 3) according to the priority of each PCS, the AGC down-transmitting power is combined with the maximum chargeable/dischargeable maximum power value of each PCS to be sequentially transmitted to each PCS, wherein the down-transmitting power of the AGC is 100kW. According to the PCS calling priority, firstly calling PCS3, and after the power of the PCS3 is met, the remaining required output power is 70kW; and secondly, calling PCS2, wherein after the control power of the PCS2 is met, the remaining required output power is 30kW, and the 30kW can be born by PCS 1. After calculation, the PCS output power is shown in table 4, and the control algorithm can ensure that the SOC of each battery unit can be balanced to the greatest extent.
Table 4: the PCS outputs a power meter.
The PCS output powers are calculated according to document 1 and equation (1) of the prior art mentioned in the background art as:
PCS1：
PCS2：
PCS3：
after calculation, as shown in table 5, the calculated power of the PCS1 is shown as the calculated power of the control algorithm, so that the PCS1 can be used for amplifying the active power, and the distributed actual power is larger, but the SOC of the PCS1 is lower at this time, the battery energy is exhausted faster under high power, and the equalization of the SOC of each battery unit is continuously increased after a period of time because the equalization correction of the SOC is not considered, which is not beneficial to ensuring the equalization of the SOC of each battery unit, and influences the energy output capability of the whole station.
Table 5: the PCS outputs a power meter.
For example, by allocating power according to the method of document 1 mentioned in the background art as related art, PCS1 will reach the discharge prohibiting threshold first, and the remaining two units PCS2 and PCS3 will not be able to bear the requirement of 100kW power output required by AGC, and can only discharge according to 70kW of the sum of maximum dischargeable powers of PCS2 and PCS3, thus affecting the output capability of the whole station. If the method for distributing PCS active power by the energy storage AGC considering SOC sequencing according to the embodiment distributes power, the output power of PCS1 is reduced, the output power of PCS3 is increased, PCS1 can operate for a long time, and the output capability of the whole station is ensured.
In addition, the present embodiment also provides a system for distributing PCS active power by the energy storage AGC taking into account SOC ordering, which comprises a microprocessor and a memory connected with each other, wherein the microprocessor is programmed or configured to execute the steps of the method for distributing PCS active power by the energy storage AGC taking into account SOC ordering.
In addition, the present embodiment also provides a computer readable storage medium having stored therein a computer program programmed or configured to perform the foregoing method of storing energy AGC allocation PCS active power taking into account SOC ordering.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (5)
1. A method for storing energy, AGC, to allocate PCS active power, accounting for SOC ordering, comprising:
1) Acquiring the SOC value of each PCS corresponding battery;
2) Sequencing the SOC values of the batteries, and sequencing and setting the priority of each PCS according to the sequence from big to small of the SOC values;
3) The AGC down power is sequentially issued to each PCS by combining the maximum chargeable/dischargeable maximum power value of each PCS according to the priority of each PCS until the AGC down power is completely distributed, comprising the following steps:
3.1 Initializing power to be allocated as AGC total downlink power;
3.2 Traversing and taking out one PCS with the highest priority from each PCS as the current PCS, if the maximum chargeable/amplified maximum power value of the current PCS is smaller than the power to be allocated, taking the maximum chargeable/amplified maximum power value of the current PCS as the AGC (automatic gain control) transmitting power of the current PCS, otherwise, taking the power to be allocated as the AGC transmitting power of the current PCS; subtracting the AGC issued power of the current PCS from the power to be allocated to obtain new power to be allocated;
3.3 Judging whether the new power to be allocated is greater than 0 or not, judging whether each PCS is traversed completely or not when the new power to be allocated is greater than 0, and executing the step 3.2) only when the PCS is not traversed completely, otherwise, judging that the total AGC downlink power is not matched, ending and exiting; when the new power to be distributed is larger than 0 and is not established, the AGC issued power, the appointed active power conversion rate and the appointed power regulation dead zone of each PCS are issued to each PCS, so that each PCS is switched from the original AGC issued power to the issued new AGC issued power according to the appointed active power conversion rate, each PCS keeps the existing power unchanged in the appointed power regulation dead zone, and the PCS is controlled according to the power deviation amount exceeding the dead zone after exceeding the appointed power regulation dead zone.
2. According to claim 1The method for distributing PCS active power by the energy storage AGC based on SOC sequencing is characterized in that the steps 1) to 3) are based on a preset periodt tick And executing at fixed time.
3. The method for distributing PCS active power by the energy storage AGC in consideration of SOC ordering as claimed in claim 2, wherein the preset periodt tick Greater than 0.1 seconds.
4. A system for storing energy AGC allocation PCS active power taking into account SOC ordering comprising a microprocessor and a memory connected to each other, characterized in that the microprocessor is programmed or configured to perform the steps of the method for storing energy AGC allocation PCS active power taking into account SOC ordering as claimed in any of claims 1 to 3.
5. A computer readable storage medium having stored therein a computer program programmed or configured to perform the method of storing energy AGC allocation PCS active power accounting for SOC ordering as claimed in any of claims 1 to 3.
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| CN114094611B (en) * | 2021-11-23 | 2023-08-08 | 国网湖南省电力有限公司 | Energy storage power station power instruction distribution method and system considering SOC consistency |
| CN114726065B (en) * | 2022-06-09 | 2022-08-09 | 中国华能集团清洁能源技术研究院有限公司 | Control method and system for battery capacity balance |
| CN115687305A (en) * | 2022-11-08 | 2023-02-03 | 力高(山东)新能源技术股份有限公司 | Energy storage power station AGC model importing and checking method |
| 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 |
| CN117791826B (en) * | 2024-02-26 | 2024-06-28 | 宁德时代新能源科技股份有限公司 | Method and device for charging and discharging battery, energy management system and energy storage system |
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