Charging and discharging control method, device and equipment of energy storage power station and storage medium
By calculating the deviation capacity of each energy storage unit in the energy storage power station and correcting the real-time power command, the SOC imbalance problem of the energy storage power station when executing AGC commands is solved, thereby improving the economic benefits of the energy storage power station.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SUNGROW SMART MAINTENANCE TECH CO LTD
- Filing Date
- 2026-03-03
- Publication Date
- 2026-05-19
AI Technical Summary
When existing energy storage power stations execute automatic generation control commands, excessive deviations occur due to SOC imbalance, equipment failures, and other reasons, leading the provincial dispatch center to shut down the AGC system and causing economic losses.
By calculating the deviation capacity of each energy storage unit in the energy storage power station, the total deviation capacity is determined, and the real-time power command is corrected to obtain the corrected total target power. Based on the total target power, the target power of each energy storage unit is determined, and charging and discharging operations are performed.
Automatically corrects SOC imbalance within the energy storage power station, preventing the provincial dispatch center from cutting off the AGC system and increasing the economic income of the energy storage power station.
Smart Images
Figure CN122068531A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of energy storage power station technology, and in particular to a charging and discharging control method, device, equipment and storage medium for an energy storage power station. Background Technology
[0002] The primary method for existing independent energy storage power stations to participate in the electricity market is day-ahead trading. This involves submitting a forecast of the electricity price and the corresponding trading volume and bid price to the provincial dispatch center one day in advance. On the bidding day, the provincial dispatch center provides the charging / discharging time slots, time-of-use trading prices, and charging / discharging power for the following day at a specified time (e.g., 19:00). On the trading day, the center issues time-of-use charging / discharging commands via Automatic Generation Control (AGC). The energy management system (EMS) of the energy storage power station receiving these commands executes the AGC commands. However, during the execution of AGC commands by the EMS, discrepancies can arise due to factors such as mismatch between reported and actual capacity, uneven battery voltage, and equipment malfunctions. These deviations can lead to performance evaluations. When the deviation is too large, the provincial dispatch center will directly shut down the AGC system, preventing the energy storage power station from conducting charging / discharging transactions. Furthermore, monthly deviation evaluations are conducted, resulting in significant economic losses. Summary of the Invention
[0003] The main purpose of this application is to provide a charging and discharging control method, device, equipment and storage medium for an energy storage power station, aiming to solve the technical problem of how to automatically correct the SOC imbalance inside the energy storage power station and improve economic income.
[0004] To achieve the above objectives, this application provides a charging and discharging control method for an energy storage power station, which includes the following steps:
[0005] The total deviation capacity of all energy storage units in the current control cycle is determined based on the deviation capacity of each energy storage unit in the energy storage power station. The received real-time power command is corrected based on the total deviation capacity to obtain the corrected total target power; The target power for each energy storage unit is determined based on the total target power, and charging and discharging operations are performed based on the target power.
[0006] Optionally, the step of correcting the received real-time power command based on the total deviation capacity to obtain the corrected total target power includes: Calculate the average power during the current control cycle based on the total deviation capacity; The average power is compensated to obtain a power compensation value; The received real-time power command is corrected based on the power compensation value to obtain the corrected total target power.
[0007] Optionally, the step of compensating the average power to obtain a power compensation value includes: Determine the actual operating status of each energy storage unit; The compensation strategy is determined based on the actual operating state, and the compensation coefficient is determined based on the compensation strategy. The compensation strategy includes: SOC equalization speed compensation and / or AGC tracking accuracy compensation. The average power is compensated based on the compensation coefficient to obtain a power compensation value.
[0008] Optionally, determining the target power corresponding to each energy storage unit based on the total target power, and performing charging and discharging operations based on the target power, includes: The operating status of each energy storage unit is determined based on the total target power. The available charge / discharge capacity weight of each energy storage unit is determined based on the operating status. The target power corresponding to each energy storage unit is calculated based on the capacity weight and the total target power, and charging and discharging operations are performed based on the target power.
[0009] Optionally, determining the operating state of each energy storage unit based on the total target power includes: When the total target power is positive, the corresponding energy storage unit is determined to be in a state that needs to be discharged. When the total target power is negative, the corresponding energy storage unit is determined to be in a state that requires charging.
[0010] Optionally, determining the available charge / discharge capacity weight of each energy storage unit based on the operating state includes: The available charge / discharge capacity of each energy storage unit and the total available charge / discharge capacity of all energy storage units are determined based on the operating status. The available charge / discharge capacity weight of each energy storage unit is calculated based on the ratio between the available charge / discharge capacity and the total available charge / discharge capacity.
[0011] Optionally, the available charge / discharge capacity includes: available charging capacity and available discharging capacity; the available total charge / discharge capacity includes: available total discharging capacity and available total charging capacity. Determining the available charge / discharge capacity of each energy storage unit and the total available charge / discharge capacity of all energy storage units based on the operating state includes: When the operating state is a state requiring discharge, the available discharge capacity of each energy storage unit and the total available discharge capacity of all energy storage units are determined based on the real-time state of charge, minimum state of charge, rated state of discharge, and rated capacity of each energy storage unit. When the operating state is a charging state, the available charging capacity of each energy storage unit and the total available charging capacity of all energy storage units are determined based on the real-time state of charge, maximum state of charge, rated charging state of charge, and rated capacity of each energy storage unit.
[0012] Optionally, determining the total deviation capacity of all energy storage units within the current control cycle based on the deviation capacity of each energy storage unit in the energy storage power station includes: Determine the control moments within the current control cycle; Determine the deviation capacity of each energy storage unit at each control moment, and calculate the total control deviation capacity of all energy storage units at each control moment based on the deviation capacity; Calculate the total deviation capacity of all energy storage units within the current control cycle based on the total control deviation capacity.
[0013] Optionally, determining the control deviation capacity of each energy storage unit at each control moment, and calculating the total control deviation capacity of all energy storage units at each control moment based on the control deviation capacity, includes: Calculate the charge difference between the real-time state of charge and the planned state of charge of each energy storage unit in the energy storage power station at each control time. The deviation capacity of each energy storage unit at each control moment is calculated based on the charge difference and the rated capacity of each energy storage unit. The total control deviation capacity of all energy storage units at each control moment is obtained by summing the deviation capacity of each energy storage unit at each control moment.
[0014] Furthermore, to achieve the above objectives, this application also provides a charging and discharging control device for an energy storage power station, the charging and discharging control device for the energy storage power station comprising: The deviation determination module is used to determine the total deviation capacity of all energy storage units in the current control cycle based on the deviation capacity of each energy storage unit in the energy storage power station. The power correction module is used to correct the received real-time power command according to the total deviation capacity to obtain the corrected total target power. The charge / discharge control module is used to determine the target power corresponding to each energy storage unit based on the total target power, and to perform charge / discharge operations based on the target power.
[0015] In addition, to achieve the above objectives, this application also proposes a charging and discharging control device for an energy storage power station, the charging and discharging control device for the energy storage power station comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the charging and discharging control method for the energy storage power station as described above.
[0016] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the charging and discharging control method of the energy storage power station as described above.
[0017] This application determines the total deviation capacity of all energy storage units within the current control cycle based on the deviation capacity of each energy storage unit in the energy storage power station. Then, it corrects the received real-time power command based on the total deviation capacity to obtain the corrected total target power. Finally, it determines the target power corresponding to each energy storage unit based on the total target power and performs charging and discharging operations based on the target power. This application first determines the total deviation capacity of all energy storage units within the current control cycle, then converts the total deviation capacity into a power compensation item and integrates it into the AGC command of the provincial dispatch center. This corrects the real-time power command in the AGC command, automatically correcting the SOC imbalance problem within the energy storage power station. It avoids excessive deviations between actual charging and discharging transaction volume and planned volume caused by the provincial dispatch center cutting off the AGC system, thereby increasing the economic income of the energy storage power station. Attached Figure Description
[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.
[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a flowchart illustrating the first embodiment of the charging and discharging control method for the energy storage power station of this application; Figure 2 This is a flowchart illustrating the second embodiment of the charging and discharging control method for the energy storage power station of this application; Figure 3 This is a flowchart illustrating the third embodiment of the charging and discharging control method for the energy storage power station of this application; Figure 4 This is a structural block diagram of the first embodiment of the charging and discharging control device for the energy storage power station of this application; Figure 5 This is a schematic diagram of the charging and discharging control equipment of an energy storage power station in the hardware operating environment involved in the embodiments of this application.
[0021] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0022] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.
[0023] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.
[0024] It should be noted that, generally, on the same day, the energy storage power station can report the trading volume and upper and lower limits of the electricity price for the next day according to the requirements of the new energy owner platform. The provincial dispatch center coordinates the declaration of independent energy storage output based on the price difference and volume, and provides the energy storage power station with the output, price, and time curve for the next day at 19:00. The energy storage power station receives the charging and discharging plan for the next day. On the next day, the provincial dispatch center remotely controls the AGC to issue instructions, and the energy storage power station's EMS tracks the AGC instructions to carry out charging and discharging. The implementing entity of this application can be the energy management system (EMS) within the energy storage power station.
[0025] Based on this, the embodiments of this application provide a charging and discharging control method for an energy storage power station, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the charging and discharging control method for the energy storage power station of this application.
[0026] In this embodiment, the charging and discharging control method of the energy storage power station includes the following steps: Step S10: Determine the total deviation capacity of all energy storage units in the current control cycle based on the deviation capacity of each energy storage unit in the energy storage power station.
[0027] Understandably, for each energy storage unit in an energy storage power station, the deviation capacity of the State of Charge (SOC) of each energy storage unit can be calculated. The deviation capacity can be the difference between the planned SOC and the actual SOC.
[0028] It should be understood that the current control cycle can be the control cycle at the current moment. In a feasible embodiment, the next day can be divided into multiple cycles in advance, such as one hour or two hours per cycle. For example, if the current moment is 9:30, the current control cycle can be 8:00-9:00. The sum of the deviation capacities of each energy storage unit within the current cycle is taken as the total deviation capacity.
[0029] Furthermore, in order to obtain the total deviation capacity of all energy storage units in the current control cycle, in this embodiment, step S10 includes: determining each control moment in the current control cycle; determining the deviation capacity of each energy storage unit at each control moment, and calculating the total control deviation capacity of all energy storage units at each control moment based on the deviation capacity; and calculating the total deviation capacity of all energy storage units in the current control cycle based on the total control deviation capacity.
[0030] Understandably, the current control cycle can consist of several control moments. For example, if the current control cycle is 8:00-9:00, the control moments could include 8:00, 8:10, 8:20, etc. The deviation capacity of each energy storage unit at each control moment can be determined. The deviation capacity can be the difference between the planned SOC and the actual SOC of each energy storage unit at each control time, and the sum of the deviation capacities of each energy storage unit at each control time is taken as the total control deviation capacity of all energy storage units at each control time.
[0031] In practical implementation, the sum of the total control deviation capacity of all energy storage units at each control moment can be taken as the total deviation capacity of all energy storage units in the current control cycle.
[0032] Furthermore, in order to determine the deviation capacity of each energy storage unit at each control time, in this embodiment, determining the control deviation capacity of each energy storage unit at each control time and calculating the total control deviation capacity of all energy storage units at each control time based on the control deviation capacity includes: calculating the charge difference between the real-time state of charge and the planned state of charge of each energy storage unit in the energy storage power station at each control time; calculating the deviation capacity of each energy storage unit at each control time based on the charge difference and the rated capacity of each energy storage unit; and summing the deviation capacities of each energy storage unit at each control time to obtain the total control deviation capacity of all energy storage units at each control time.
[0033] It should be understood that the real-time state of charge (SOC) and planned SOC of each energy storage unit at each control time can be calculated first. The real-time SOC can be the SOC of each energy storage unit at control time t. , N represents the total number of energy storage units, and the planned state of charge (SOC) can be the predicted SOC value that each energy storage unit should achieve at the predicted control time t. In one feasible embodiment, the planned State of Charge (SOC) can be obtained based on the charging and discharging plan formulated in the previous scheduling cycle. The previous scheduling cycle can be the cycle of the same time period of the previous day, such as the cycle of 8:00-9:00 on the previous day, and the actual SOC of this cycle is used as the planned SOC at the current control moment. Then, the difference between the actual state of charge and the planned state of charge is calculated as the charge difference. .
[0034] In the specific implementation, the deviation capacity at control time t , Let t be the rated capacity. By summing the deviation capacities of each energy storage unit at each control time t, the total control deviation capacity of all energy storage units at each control time can be obtained, which can be expressed as: , This represents the total control deviation capacity at control time t.
[0035] Step S20: Correct the received real-time power command according to the total deviation capacity to obtain the corrected total target power.
[0036] Understandably, the real-time power command sent by the provincial dispatch center can be corrected based on the total deviation capacity of all energy storage units in the current control cycle. In one feasible embodiment, the average power can be calculated first based on the total deviation capacity, and then the real-time power can be added to the average power to obtain the corrected total target power.
[0037] Step S30: Determine the target power corresponding to each energy storage unit based on the total target power, and perform charging and discharging operations based on the target power.
[0038] It should be understood that the total target power can be allocated to each energy storage unit to obtain the target power corresponding to each energy storage unit. In one feasible embodiment, the target power corresponding to each energy storage unit can be the total target power divided by the total number of energy storage units, and the target power corresponding to each energy storage unit is sent to the corresponding energy storage converter to perform charging and discharging operations.
[0039] This embodiment determines the total deviation capacity of all energy storage units within the current control cycle based on the deviation capacity of each energy storage unit in the energy storage power station. Then, it corrects the received real-time power command based on the total deviation capacity to obtain the corrected total target power. Finally, it determines the target power for each energy storage unit based on the total target power and performs charging and discharging operations based on the target power. This embodiment first determines the total deviation capacity of all energy storage units within the current control cycle, then converts the total deviation capacity into a power compensation item and integrates it into the AGC command of the provincial dispatch center. This corrects the real-time power command in the AGC command, automatically correcting the SOC imbalance problem within the energy storage power station. It avoids the provincial dispatch center cutting off the AGC system, which could lead to excessive deviations between the actual charging and discharging volume and the planned volume, thereby increasing the economic income of the energy storage power station.
[0040] refer to Figure 2 , Figure 2 This is a flowchart illustrating the second embodiment of the charging and discharging control method for the energy storage power station of this application.
[0041] Based on the first embodiment described above, in this embodiment, step S20 includes: Step S201: Calculate the average power within the current control cycle based on the total deviation capacity.
[0042] Understandably, the total deviation capacity can be... Converted to the current control cycle The average power of internal compensation is calculated using the following formula: , This represents the average power.
[0043] Step S202: Compensate the average power to obtain a power compensation value.
[0044] In practice, the average power can be compensated based on the compensation coefficient to obtain the power compensation value, which can be the average power multiplied by the compensation coefficient.
[0045] Further, in this embodiment, step S202 includes: determining the actual operating state corresponding to each energy storage unit; determining a compensation strategy based on the actual operating state, and determining a compensation coefficient based on the compensation strategy, wherein the compensation strategy includes: SOC equalization speed compensation and / or AGC tracking accuracy compensation; and compensating the average power based on the compensation coefficient to obtain a power compensation value.
[0046] It should be understood that the compensation strategy can be determined based on the actual operating conditions. The compensation strategy may include SOC equalization speed compensation and / or AGC tracking accuracy compensation. In one feasible embodiment, the compensation coefficient is... If, based on the actual operating conditions, it is determined that more emphasis needs to be placed on the SOC balancing speed, then the compensation coefficient can be set to a larger value; if, based on the actual operating conditions, it is determined that more emphasis needs to be placed on the AGC tracking accuracy, then the compensation coefficient can be set to a smaller value; if, based on the actual operating conditions, it is determined that there is a balance between the SOC balancing speed and the AGC tracking accuracy, then the compensation coefficient can be set to an intermediate value.
[0047] In practice, the average power can be compensated based on the compensation coefficient, and the resulting power compensation value is average power × compensation coefficient.
[0048] Step S203: Correct the received real-time power command based on the power compensation value to obtain the corrected total target power.
[0049] Understandably, the received real-time power command can be corrected based on the power compensation value to obtain the corrected total target power. , The corrected total target power, The power command is the AGC command from the provincial dispatch center, where k is the compensation coefficient. This represents the average power.
[0050] This embodiment calculates the average power within the current control cycle based on the total deviation capacity, then compensates for the average power to obtain a power compensation value. The received real-time power command is then corrected based on this power compensation value to obtain the corrected total target power. This embodiment first distributes power evenly based on the total deviation capacity, then compensates for the average power at each control moment, and then corrects the real-time power command based on the power compensation value to obtain the total target power at each control moment. This allows the total deviation capacity to be converted into a power compensation item and integrated into the AGC command of the provincial dispatch center, thereby correcting the real-time power command in the AGC command.
[0051] refer to Figure 3 , Figure 3 This is a flowchart illustrating the third embodiment of the charging and discharging control method for the energy storage power station of this application.
[0052] Based on the above embodiments, in this embodiment, step S30 includes: Step S301: Determine the operating status of each energy storage unit based on the total target power.
[0053] Understandably, the operating state of each energy storage unit can be determined based on the positive or negative value of the total target power, which may be a state that needs to be discharged or a state that needs to be charged.
[0054] Furthermore, in this embodiment, step S301 includes: when the total target power is positive, determining that the corresponding energy storage unit is in a state that needs to be discharged; when the total target power is negative, determining that the corresponding energy storage unit is in a state that needs to be charged.
[0055] It should be understood that when the total target power is positive, the operating state of all energy storage units in the energy storage power station can be determined as the state of needing to discharge; when the total target power is negative, the operating state of all energy storage units in the energy storage power station can be determined as the state of needing to charge.
[0056] Step S302: Determine the available charge / discharge capacity weight of each energy storage unit based on the operating status.
[0057] In practical implementation, when the energy storage unit is in a state of needing to discharge, the available discharge weight of each energy storage unit can be determined; when the energy storage unit is in a state of needing to charge, the available charging weight of each energy storage unit can be determined.
[0058] Further, in this embodiment, step S302 includes: determining the available charge / discharge capacity of each energy storage unit and the total available charge / discharge capacity of all energy storage units based on the operating state; and calculating the available charge / discharge capacity weight of each energy storage unit based on the ratio between the available charge / discharge capacity and the total available charge / discharge capacity.
[0059] Understandably, when the energy storage unit is in a state requiring discharge, the available discharge capacity of each energy storage unit can be determined, i.e., the absolute safe discharge capacity allowed at the current moment, and the total available discharge capacity of all energy storage units can be determined, which can be the sum of the absolute safe discharge capacities of all energy storage units operating in parallel. When the energy storage unit is in a state requiring charging, the available charging capacity of each energy storage unit can be determined, i.e., the absolute safe charging capacity allowed at the current moment, and the total available charging capacity of all energy storage units can be determined, which can be the sum of the absolute safe charging capacities of all energy storage units operating in parallel.
[0060] In practical implementation, when the energy storage unit is in a discharge-requiring state, the available discharge capacity weight can be the ratio between the available discharge capacity of each energy storage unit and the total available discharge capacity, i.e., the ratio between the allowable discharge capacity of each energy storage unit and the allowable discharge capacity of the energy storage system, representing the proportion of discharge power that each energy storage unit should bear. When the energy storage unit is in a charging-requiring state, the available charging capacity weight can be the ratio between the available charging capacity of each energy storage unit and the total available charging capacity, i.e., the ratio between the allowable charging capacity of each energy storage unit and the allowable charging capacity of the energy storage system, representing the proportion of charging power that each energy storage unit should bear. The sum of the available charging capacity weights or available discharge capacity weights corresponding to all energy storage units can be 1.
[0061] Further, in this embodiment, determining the available charge / discharge capacity of each energy storage unit and the total available charge / discharge capacity of all energy storage units based on the operating state includes: when the operating state is a discharge state, determining the available discharge capacity of each energy storage unit and the total available discharge capacity of all energy storage units based on the real-time state of charge, minimum state of charge, rated state of discharge, and rated capacity of each energy storage unit; and when the operating state is a charge state, determining the available charging capacity of each energy storage unit and the total available charging capacity of all energy storage units based on the real-time state of charge, maximum state of charge, rated state of charge, and rated capacity of each energy storage unit.
[0062] It should be understood that, when the operating state is a state requiring discharge, the available discharge capacity weight of each energy storage unit can be calculated using the following formula:
[0063] In the formula, Let represent the available discharge capacity weight of the i-th energy storage unit at time t, and let the numerator represent the available discharge capacity of the i-th energy storage unit at time t. This represents the real-time state of charge of the i-th energy storage unit at time t. This represents the minimum state of charge (SOC) of the i-th energy storage unit, i.e., the minimum permissible SOC limit. This represents the rated state of charge (SOC) of the i-th energy storage unit, i.e., the maximum permissible SOC depth for a single discharge. This is a safety constraint to prevent over-discharge. This represents the rated capacity of the i-th energy storage unit. The denominator represents the total available discharge capacity of all energy storage units at time t. This represents the real-time state of charge of the j-th energy storage unit at time t. This represents the minimum state of charge of the j-th energy storage unit. This represents the rated charge state of the j-th energy storage unit. This represents the rated capacity of the j-th energy storage unit.
[0064] In practical implementation, when the operating state is one that requires charging, the available charging capacity weight of each energy storage unit can be calculated using the following formula:
[0065] In the formula, Let represent the available charging capacity weight of the i-th energy storage unit at time t, and let the numerator represent the available charging capacity of the i-th energy storage unit at time t. This represents the real-time state of charge of the i-th energy storage unit at time t. This represents the maximum state of charge (SOC) of the i-th energy storage unit, i.e., the maximum permissible SOC limit. This represents the rated state of charge (SOC) of the i-th energy storage unit, i.e., the maximum permissible SOC depth for a single charge. This is a safety constraint to prevent overcharging. This represents the rated capacity of the i-th energy storage unit. The denominator represents the total available charging capacity of all energy storage units at time t. This represents the real-time state of charge of the j-th energy storage unit at time t. This represents the maximum state of charge of the j-th energy storage unit. This represents the rated state of charge of the j-th energy storage unit. This represents the rated capacity of the j-th energy storage unit.
[0066] Step S303: Calculate the target power corresponding to each energy storage unit according to the capacity weight and the total target power, and perform charging and discharging operations based on the target power.
[0067] Understandably, the target power corresponding to each energy storage unit can be calculated using the following formula: , This represents the target power of the i-th energy storage unit at time t. This represents the available discharge capacity weight or available charging capacity weight of the i-th energy storage unit at time t. This is the corrected total target power. The commands are then sent to the corresponding energy storage converters to perform charging and discharging operations.
[0068] In its implementation, this embodiment adaptively calculates capacity weights. Energy storage units with high SOC automatically undertake more discharge tasks, while those with SOC near the lower limit automatically reduce their output, requiring no manual intervention. and These parameters prevent any single cell from being over-discharged or over-charged, which is beneficial to the long-term health of the battery.
[0069] This embodiment determines the operating state of each energy storage unit based on the total target power, then determines the available charge / discharge capacity weight of each energy storage unit based on the operating state, calculates the target power corresponding to each energy storage unit based on the capacity weight and the total target power, and performs charge / discharge operations based on the target power. This embodiment determines the available charging capacity weight or available discharging weight of each energy storage unit based on its operating state, thus obtaining the proportion of discharge power or charging power that each energy storage unit should undertake. By calculating the target power corresponding to each energy storage unit based on the capacity weight and the total target power, it can adaptively adjust the target power and, under the premise of safety, maximize the discharge or charging capacity of each energy storage unit to achieve the maximum available power of the overall energy storage system.
[0070] Reference Figure 4 , Figure 4 This is a structural block diagram of the first embodiment of the charging and discharging control device for the energy storage power station of this application.
[0071] like Figure 4 As shown, the charging and discharging control device for the energy storage power station proposed in this application includes: Deviation determination module 10 is used to determine the total deviation capacity of all energy storage units in the current control cycle based on the deviation capacity of each energy storage unit in the energy storage power station. The power correction module 20 is used to correct the received real-time power command according to the total deviation capacity to obtain the corrected total target power. The charge / discharge control module 30 is used to determine the target power corresponding to each energy storage unit according to the total target power, and to perform charge / discharge operations based on the target power.
[0072] This embodiment determines the total deviation capacity of all energy storage units within the current control cycle based on the deviation capacity of each energy storage unit in the energy storage power station. Then, it corrects the received real-time power command based on the total deviation capacity to obtain the corrected total target power. Finally, it determines the target power for each energy storage unit based on the total target power and performs charging and discharging operations based on the target power. This embodiment first determines the total deviation capacity of all energy storage units within the current control cycle, then converts the total deviation capacity into a power compensation item and integrates it into the AGC command of the provincial dispatch center. This corrects the real-time power command in the AGC command, automatically correcting the SOC imbalance problem within the energy storage power station. It avoids the provincial dispatch center cutting off the AGC system, which could lead to excessive deviations between the actual charging and discharging volume and the planned volume, thereby increasing the economic income of the energy storage power station.
[0073] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of this application. In practical applications, those skilled in the art can select some or all of it to achieve the purpose of this embodiment according to actual needs, and no restrictions are imposed here.
[0074] In addition, for technical details not described in detail in this embodiment, please refer to the charging and discharging control method of the energy storage power station provided in any embodiment of this application, which will not be repeated here.
[0075] Based on the first embodiment of the charging and discharging control device for the energy storage power station described in this application, a second embodiment of the charging and discharging control device for the energy storage power station of this application is proposed.
[0076] In this embodiment, the power correction module 20 is further configured to calculate the average power within the current control cycle based on the total deviation capacity; compensate the average power to obtain a power compensation value; and correct the received real-time power command based on the power compensation value to obtain the corrected total target power.
[0077] Furthermore, the power correction module 20 is also used to determine the actual operating state of each energy storage unit; determine a compensation strategy based on the actual operating state, and determine a compensation coefficient based on the compensation strategy, wherein the compensation strategy includes: SOC equalization speed compensation and / or AGC tracking accuracy compensation; and compensate the average power based on the compensation coefficient to obtain a power compensation value.
[0078] Furthermore, the charge / discharge control module 30 is also used to determine the operating state of each energy storage unit based on the total target power; determine the available charge / discharge capacity weight of each energy storage unit based on the operating state; calculate the target power corresponding to each energy storage unit based on the capacity weight and the total target power; and perform charge / discharge operations based on the target power.
[0079] Furthermore, the charge and discharge control module 30 is also used to determine that the corresponding energy storage unit is in a state that needs to be discharged when the total target power is positive. When the total target power is negative, the corresponding energy storage unit is determined to be in a state that requires charging.
[0080] Furthermore, the charge / discharge control module 30 is also used to determine the available charge / discharge capacity of each energy storage unit and the total available charge / discharge capacity of all energy storage units according to the working state; and to calculate the available charge / discharge capacity weight of each energy storage unit according to the ratio between the available charge / discharge capacity and the total available charge / discharge capacity.
[0081] Further, the available charge / discharge capacity includes: available charging capacity and available discharging capacity; the available total charge / discharge capacity includes: available total discharging capacity and available total charging capacity; the charge / discharge control module 30 is also used to determine the available discharge capacity of each energy storage unit and the available total discharge capacity of all energy storage units based on the real-time state of charge, minimum state of charge, rated state of discharge, and rated capacity of each energy storage unit when the working state is a state requiring discharge; and to determine the available charging capacity of each energy storage unit and the available total charging capacity of all energy storage units based on the real-time state of charge, maximum state of charge, rated state of charge, and rated capacity of each energy storage unit when the working state is a state requiring charging.
[0082] Furthermore, the deviation determination module 10 is also used to determine each control moment within the current control cycle; determine the deviation capacity of each energy storage unit at each control moment, and calculate the total control deviation capacity of all energy storage units at each control moment based on the deviation capacity; and calculate the total deviation capacity of all energy storage units within the current control cycle based on the total control deviation capacity.
[0083] Furthermore, the deviation determination module 10 is also used to calculate the charge difference between the real-time state of charge and the planned state of charge of each energy storage unit in the energy storage power station at each control time; calculate the deviation capacity of each energy storage unit at each control time based on the charge difference and the rated capacity of each energy storage unit; and sum the deviation capacities of each energy storage unit at each control time to obtain the total control deviation capacity of all energy storage units at each control time.
[0084] Other embodiments or specific implementations of the charging and discharging control device for the energy storage power station of this application can be referred to the above-described method embodiments, and will not be repeated here.
[0085] This application provides a charging and discharging control device for an energy storage power station. The charging and discharging control device for the energy storage power station includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the charging and discharging control method of the energy storage power station in the above embodiment 1.
[0086] The following is for reference. Figure 5This document illustrates a schematic diagram of a charging and discharging control device suitable for implementing the embodiments of this application's energy storage power station. The charging and discharging control device for the energy storage power station in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), and vehicle terminals (e.g., vehicle navigation terminals), as well as fixed terminals such as digital TVs and desktop computers. Figure 5 The charging and discharging control device of the energy storage power station shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.
[0087] like Figure 5 As shown, the charging and discharging control device of the energy storage power station may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to the program stored in the read-only memory (ROM) 1002 or the program loaded from the storage device 1003 into the random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the charging and discharging control device of the energy storage power station. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to I / O interface 1006: input devices 1007 including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices 1008 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 1003 including, for example, magnetic tapes, hard disks, etc.; and communication devices 1009. Communication device 1009 allows the charge / discharge control equipment of the energy storage power station to communicate wirelessly or wiredly with other devices to exchange data. Although the figure shows a charge / discharge control equipment of an energy storage power station with various systems, it should be understood that it is not required to implement or possess all the systems shown. More or fewer systems can be implemented alternatively.
[0088] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.
[0089] The charging and discharging control device for the energy storage power station provided in this application, employing the charging and discharging control method for the energy storage power station in the above embodiments, can solve the technical problem of how to automatically correct the SOC imbalance inside the energy storage power station and improve economic income. Compared with the prior art, the beneficial effects of the charging and discharging control device for the energy storage power station provided in this application are the same as the beneficial effects of the charging and discharging control method for the energy storage power station provided in the above embodiments, and other technical features in the charging and discharging control device for the energy storage power station are the same as the features disclosed in the method of the previous embodiment, and will not be repeated here.
[0090] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.
[0091] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
[0092] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, which are used to execute the charging and discharging control method of the energy storage power station in the above embodiments.
[0093] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.
[0094] The aforementioned computer-readable storage medium may be included in the charge and discharge control equipment of the energy storage power station; or it may exist independently and not be assembled into the charge and discharge control equipment of the energy storage power station.
[0095] The aforementioned computer-readable storage medium carries one or more programs. When the aforementioned one or more programs are executed by the charging and discharging control device of the energy storage power station, the charging and discharging control device of the energy storage power station: determines the total deviation capacity of all energy storage units in the current control cycle based on the deviation capacity of each energy storage unit in the energy storage power station; corrects the received real-time power command based on the total deviation capacity to obtain the corrected total target power; determines the target power corresponding to each energy storage unit based on the total target power, and performs charging and discharging operations based on the target power.
[0096] Computer program code for performing the operations of this application can be written in one or more programming languages or a combination thereof. These programming languages include object-oriented programming languages—such as Python, Java, Smalltalk, and C++—and conventional procedural programming languages—such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).
[0097] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.
[0098] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.
[0099] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the charging and discharging control method of the above-described energy storage power station. This solves the technical problem of how to automatically correct the SOC imbalance within the energy storage power station and improve economic returns. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the charging and discharging control method of the energy storage power station provided in the above embodiments, and will not be elaborated upon here.
[0100] The above description is only a part of the embodiments of this application and does not limit the scope of protection of this application. All equivalent structural transformations made under the technical concept of this application and using the content of this application specification and drawings, or direct / indirect applications in other related technical fields, are included in the scope of protection of this application.
Claims
1. A charging and discharging control method for an energy storage power station, characterized in that, The charging and discharging control method of the energy storage power station includes the following steps: The total deviation capacity of all energy storage units in the current control cycle is determined based on the deviation capacity of each energy storage unit in the energy storage power station. The received real-time power command is corrected based on the total deviation capacity to obtain the corrected total target power; The target power for each energy storage unit is determined based on the total target power, and charging and discharging operations are performed based on the target power.
2. The charging and discharging control method for an energy storage power station as described in claim 1, characterized in that, The step of correcting the received real-time power command based on the total deviation capacity to obtain the corrected total target power includes: Calculate the average power during the current control cycle based on the total deviation capacity; The average power is compensated to obtain a power compensation value; The received real-time power command is corrected based on the power compensation value to obtain the corrected total target power.
3. The charging and discharging control method for an energy storage power station as described in claim 2, characterized in that, The step of compensating the average power to obtain a power compensation value includes: Determine the actual operating status of each energy storage unit; The compensation strategy is determined based on the actual operating state, and the compensation coefficient is determined based on the compensation strategy. The compensation strategy includes: SOC equalization speed compensation and / or AGC tracking accuracy compensation. The average power is compensated based on the compensation coefficient to obtain a power compensation value.
4. The charging and discharging control method for an energy storage power station as described in claim 1, characterized in that, The step of determining the target power corresponding to each energy storage unit based on the total target power, and performing charging and discharging operations based on the target power, includes: The operating status of each energy storage unit is determined based on the total target power. The available charge / discharge capacity weight of each energy storage unit is determined based on the operating status. The target power corresponding to each energy storage unit is calculated based on the capacity weight and the total target power, and charging and discharging operations are performed based on the target power.
5. The charging and discharging control method for an energy storage power station as described in claim 4, characterized in that, Determining the operating state of each energy storage unit based on the total target power includes: When the total target power is positive, the corresponding energy storage unit is determined to be in a state that needs to be discharged. When the total target power is negative, the corresponding energy storage unit is determined to be in a state that requires charging.
6. The charging and discharging control method for an energy storage power station as described in claim 5, characterized in that, The step of determining the available charge / discharge capacity weight of each energy storage unit based on the operating state includes: The available charge / discharge capacity of each energy storage unit and the total available charge / discharge capacity of all energy storage units are determined based on the operating status. The available charge / discharge capacity weight of each energy storage unit is calculated based on the ratio between the available charge / discharge capacity and the total available charge / discharge capacity.
7. The charging and discharging control method for an energy storage power station as described in claim 6, characterized in that, The available charge / discharge capacity includes: available charging capacity and available discharging capacity; the available total charge / discharge capacity includes: available total discharging capacity and available total charging capacity. Determining the available charge / discharge capacity of each energy storage unit and the total available charge / discharge capacity of all energy storage units based on the operating state includes: When the operating state is a state requiring discharge, the available discharge capacity of each energy storage unit and the total available discharge capacity of all energy storage units are determined based on the real-time state of charge, minimum state of charge, rated state of discharge, and rated capacity of each energy storage unit. When the operating state is a charging state, the available charging capacity of each energy storage unit and the total available charging capacity of all energy storage units are determined based on the real-time state of charge, maximum state of charge, rated charging state of charge, and rated capacity of each energy storage unit.
8. The charging and discharging control method for an energy storage power station as described in any one of claims 1 to 7, characterized in that, The determination of the total deviation capacity of all energy storage units within the current control cycle based on the deviation capacity of each energy storage unit in the energy storage power station includes: Determine the control moments within the current control cycle; Determine the deviation capacity of each energy storage unit at each control moment, and calculate the total control deviation capacity of all energy storage units at each control moment based on the deviation capacity; Calculate the total deviation capacity of all energy storage units within the current control cycle based on the total control deviation capacity.
9. The charging and discharging control method for an energy storage power station as described in claim 8, characterized in that, The process of determining the control deviation capacity of each energy storage unit at each control moment, and calculating the total control deviation capacity of all energy storage units at each control moment based on the control deviation capacity, includes: Calculate the charge difference between the real-time state of charge and the planned state of charge of each energy storage unit in the energy storage power station at each control time. The deviation capacity of each energy storage unit at each control moment is calculated based on the charge difference and the rated capacity of each energy storage unit. The total control deviation capacity of all energy storage units at each control moment is obtained by summing the deviation capacity of each energy storage unit at each control moment.
10. A charging and discharging control device for an energy storage power station, characterized in that, The charging and discharging control device of the energy storage power station includes: The deviation determination module is used to determine the total deviation capacity of all energy storage units in the current control cycle based on the deviation capacity of each energy storage unit in the energy storage power station. The power correction module is used to correct the received real-time power command according to the total deviation capacity to obtain the corrected total target power. The charge / discharge control module is used to determine the target power corresponding to each energy storage unit based on the total target power, and to perform charge / discharge operations based on the target power.
11. A charging and discharging control device for an energy storage power station, characterized in that, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the charging and discharging control method for the energy storage power station as described in any one of claims 1 to 9.
12. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the charging and discharging control method of the energy storage power station as described in any one of claims 1 to 9.