Power distribution method and device suitable for large-scale energy storage power station

Abstract

The embodiment of the invention provides a power distribution method and device suitable for a large-scale energy storage power station, and the method comprises the steps: a power control system determines a charging and discharging mode of each energy storage unit in the large-scale energy storage power station according to a total target instruction; the power control system collects charging and discharging information of each energy storage unit according to the charging and discharging mode of each energy storage unit in the large-scale energy storage power station, and judges whether each energy storage unit meets a charging and discharging power distribution operation condition or not under the total target instruction according to the charging and discharging information of each energy storage unit; when it is judged that each energy storage unit meets the charging and discharging power distribution operation condition under the total target instruction, the power control system sequentially calculates the charging and discharging power value of each energy storage unit according to the charging and discharging information of each energy storage unit and the total target instruction, and the calculated charging and discharging power values are sent to the corresponding energy storage units, so that the power distribution of the large-scale energy storage power station is realized.

Description

Technical Field

[0001] This application relates to the field of power distribution technology, and in particular to a power distribution method and apparatus suitable for large-scale energy storage power stations. Background Technology

[0002] In large-scale energy storage power plants, the overall target command is distributed to each energy storage unit by the energy storage coordinator. Due to the large number of energy storage units, unit equipment failures or failure to meet charging and discharging conditions are highly likely. Furthermore, the distribution process must ensure the balance of power across all energy storage units, and the commands allocated to each unit need to be limited to prevent battery overcurrent and ensure the depth of charge and discharge, thereby avoiding overcharging and over-discharging. Because of these issues, problems can easily arise during the power command distribution process. Summary of the Invention

[0003] In view of this, embodiments of this application provide a power distribution method suitable for large-scale energy storage power stations. One or more embodiments of this application also relate to a power distribution device suitable for large-scale energy storage power stations, a computing device, a computer-readable storage medium, and a computer program, to address the technical deficiencies existing in the prior art.

[0004] According to a first aspect of the embodiments of this application, a power allocation method suitable for large-scale energy storage power stations is provided, comprising: The power control system determines the charging and discharging modes of each energy storage unit in the large-scale energy storage power station based on the overall target instructions. The power control system collects the charging and discharging information of each energy storage unit according to the charging and discharging mode of each energy storage unit in the large-scale energy storage power station, and determines whether each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command based on the charging and discharging information of each energy storage unit. When it is determined that each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target instruction, the power control system calculates the charging and discharging power value of each energy storage unit in sequence according to the charging and discharging information of each energy storage unit and the overall target instruction, and sends the calculated charging and discharging power value to the corresponding energy storage unit to realize the power allocation of the large-scale energy storage power station.

[0005] Preferably, the power control system determines the charging and discharging modes of each energy storage unit in the large-scale energy storage power station according to the overall target instruction, including: The power control system compares the total target power value in the total target command with 0; If the total target power value in the total target instruction is greater than 0, then the power control system determines that each energy storage unit in the large-scale energy storage power station is in discharge mode; If the total target power value in the total target instruction is less than 0, then the power control system determines that each energy storage unit in the large-scale energy storage power station is in charging mode.

[0006] Preferably, the power control system collects the charging and discharging information of each energy storage unit according to the charging and discharging mode of each energy storage unit in the large-scale energy storage power station, and determines whether each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command based on the charging and discharging information of each energy storage unit, including: When it is determined that each energy storage unit in a large-scale energy storage power station is in discharge mode, the power control system collects discharge information of each energy storage unit, including equipment status, discharge SOC value and discharge power limit value. When the device status in the discharge information of each energy storage unit is in discharge operation state, the discharge SOC value is greater than the preset lower limit of SOC value and the discharge power limit value is greater than 0, the power control system determines that each energy storage unit meets the discharge power allocation operation conditions under the overall target command. If the device status in the discharge information of any energy storage unit is not in discharge operation state, the discharge SOC value is greater than the preset lower limit of SOC value and the discharge power limit value is greater than 0, or if the device status in the discharge information of any energy storage unit is in discharge operation state, the discharge SOC value is not greater than the preset lower limit of SOC value and the discharge power limit value is greater than 0, or if the device status in the discharge information of any energy storage unit is in discharge operation state, the discharge SOC value is greater than the preset lower limit of SOC value and the discharge power limit value is not greater than 0, then the power control system determines that each energy storage unit does not meet the discharge power allocation operation conditions under the overall target command.

[0007] Preferably, the power control system collects the charging and discharging information of each energy storage unit according to the charging and discharging mode of each energy storage unit in the large-scale energy storage power station, and determines whether each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command based on the charging and discharging information of each energy storage unit, including: When it is determined that each energy storage unit in a large-scale energy storage power station is in charging mode, the power control system collects charging information for each energy storage unit, including equipment status, charging SOC value and charging power limit value. When the device status in the charging information of each energy storage unit is charging operation status, the charging SOC value is less than the preset SOC upper limit value and the charging power limit value is greater than 0, the power control system determines that each energy storage unit meets the charging power allocation operation conditions under the overall target command. If the device status in the charging information of any energy storage unit is not in charging operation state, the charging SOC value is less than the preset SOC upper limit value and the charging power limit value is greater than 0, or if the device status in the charging information of any energy storage unit is in charging operation state, the charging SOC value is not less than the preset SOC upper limit value and the charging power limit value is greater than 0, or if the device status in the charging information of any energy storage unit is in charging operation state, the charging SOC value is less than the preset SOC upper limit value and the charging power limit value is not greater than 0, then the power control system determines that each energy storage unit does not meet the charging power allocation operation conditions under the overall target command.

[0008] Preferably, when it is determined that each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command, the power control system calculates the charging and discharging power value of each energy storage unit sequentially based on the charging and discharging information of each energy storage unit and the overall target command, including: When it is determined that each energy storage unit meets the discharge power allocation operation conditions under the overall target command, the power control system calculates the discharge power allocation weight of each energy storage unit in sequence according to the discharge SOC value in the discharge information of each energy storage unit. When allocating discharge power to the current energy storage unit, the power control system calculates the current remaining available discharge power value in the overall target instruction based on the overall target power value in the overall target instruction and the discharge power values ​​already allocated to the previous energy storage units. The power control system calculates the discharge power value to be allocated to the current energy storage unit based on the discharge power allocation weight of the current energy storage unit and the current remaining available discharge power value. It then compares the discharge power value to be allocated to the current energy storage unit with a preset discharge power limit value and selects the smaller value as the discharge power value of the current energy storage unit.

[0009] Preferably, when it is determined that each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command, the power control system calculates the charging and discharging power value of each energy storage unit sequentially based on the charging and discharging information of each energy storage unit and the overall target command, including: When it is determined that each energy storage unit meets the charging power allocation operation conditions under the overall target command, the power control system calculates the charging power allocation weight of each energy storage unit in turn based on the charging SOC value in the charging information of each energy storage unit. When allocating charging power to the current energy storage unit, the power control system calculates the current remaining available charging power value in the total target instruction based on the total target power value in the total target instruction and the charging power values ​​already allocated to the previous energy storage units. The power control system calculates the charging power value to be allocated to the current energy storage unit based on the charging power allocation weight of the current energy storage unit and the current remaining available charging power value. It then compares the charging power value to be allocated to the current energy storage unit with a preset charging power limit value and selects the larger value as the charging power value of the current energy storage unit.

[0010] Preferably, it further includes: When it is determined that any energy storage unit does not meet the charging and discharging power allocation operation conditions under the overall target command, the power control system sets the charging and discharging power value to 0 and sends it to the energy storage unit that does not meet the charging and discharging power allocation operation conditions.

[0011] According to a second aspect of the embodiments of this application, a power distribution device suitable for large-scale energy storage power stations is provided, comprising: The determination module is configured to determine the charging and discharging modes of each energy storage unit in a large-scale energy storage power station based on the overall target instructions. The data acquisition and judgment module is configured to acquire the charging and discharging information of each energy storage unit according to the charging and discharging mode of each energy storage unit in the large-scale energy storage power station, and determine whether each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command based on the charging and discharging information of each energy storage unit. The power distribution module is configured such that when it is determined that each energy storage unit meets the charging and discharging power distribution operation conditions under the overall target instruction, the power control system calculates the charging and discharging power value of each energy storage unit in sequence according to the charging and discharging information of each energy storage unit and the overall target instruction, and sends the calculated charging and discharging power value to the corresponding energy storage unit, so as to realize the power distribution of the large-scale energy storage power station.

[0012] According to a third aspect of the embodiments of this application, a computing device is provided, comprising: Memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement any of the steps of the power allocation method applicable to large-scale energy storage power stations.

[0013] According to a fourth aspect of the embodiments of this application, a computer-readable storage medium is provided that stores computer-executable instructions, which, when executed by a processor, implement the steps of any one of the power distribution methods applicable to large-scale energy storage power plants.

[0014] According to a fifth aspect of the embodiments of this application, a computer program is provided, wherein when the computer program is executed in a computer, it causes the computer to perform the steps of the power allocation method applicable to large-scale energy storage power stations described above.

[0015] The power allocation scheme for large-scale energy storage power stations provided in this application embodiment monitors the equipment status, SOC, charge and discharge power limits, and set upper and lower limits of each energy storage unit in real time. It calculates the power allocation weight of each energy storage unit in real time and allocates the charge and discharge power of the corresponding energy storage units according to the power allocation weight of each energy storage unit. During the allocation process, the power balance of each energy storage unit is ensured. At the same time, by restricting the instructions allocated to each unit, the battery overcurrent situation and the battery overcharge and over-discharge situation are avoided. Attached Figure Description

[0016] Figure 1 This is a flowchart of a power allocation method applicable to large-scale energy storage power stations provided in one embodiment of this application; Figure 2 This is a schematic diagram of the power control system and each energy storage unit provided in one embodiment of this application; Figure 3 This is a flowchart of the parameter and instruction input stage provided in one embodiment of this application; Figure 4 This is a flowchart of the charging / discharging mode determination stage provided in one embodiment of this application; Figure 5 This is a flowchart of a power allocation method for a discharge mode provided in one embodiment of this application; Figure 6 This is a flowchart of a power allocation method for a charging mode provided in one embodiment of this application; Figure 7 This is a schematic diagram of a power distribution device suitable for large-scale energy storage power stations according to an embodiment of this application; Figure 8 This is a structural block diagram of a computing device provided in one embodiment of this application. Detailed Implementation

[0017] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below.

[0018] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and in the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0019] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0020] This invention relates to the operation strategy of centralized energy storage systems. Specifically, it relates to the strategy of automatic cluster removal and automatic recovery and rejoining after a fault. In the event of a fault, no manual intervention is required. The entire stack automatically removes only the corresponding faulty cluster, while other clusters can continue to operate. This design can improve the overall stack's operating time and efficiency. Furthermore, after the faulty cluster is restored, a corresponding automatic recovery and rejoining process is designed. It does not simply rely on differential pressure for judgment, ensuring the consistency of lithium iron phosphate cells. At the same time, it automatically rejoins the faulty cluster back into the overall stack without affecting scheduling.

[0021] This application provides a power distribution method suitable for large-scale energy storage power stations. This application also relates to a power distribution device suitable for large-scale energy storage power stations, a computing device, a computer-readable storage medium, and a computer program, which will be described in detail in the following embodiments.

[0022] Figure 1 This is a flowchart illustrating a power allocation method suitable for large-scale energy storage power stations, provided in one embodiment of this application. Figure 1 As shown, the specific steps include: Step S101: The power control system determines the charging and discharging modes of each energy storage unit in the large-scale energy storage power station according to the overall target instruction. In one specific embodiment of this application, the power control system determines the charging and discharging mode of each energy storage unit in the large-scale energy storage power station according to the overall target instruction. This includes: the power control system comparing the overall target power value in the overall target instruction with 0; if the overall target power value in the overall target instruction is greater than 0, the power control system determines that each energy storage unit in the large-scale energy storage power station is in discharge mode; if the overall target power value in the overall target instruction is less than 0, the power control system determines that each energy storage unit in the large-scale energy storage power station is in charging mode. For example, if the overall target power value in the overall target instruction is 50,000 kW, then each energy storage unit in the large-scale energy storage power station is determined to be in discharge mode; if the overall target power value in the overall target instruction is -50,000 kW, then each energy storage unit in the large-scale energy storage power station is determined to be in charging mode.

[0023] Step S102: The power control system collects the charging and discharging information of each energy storage unit according to the charging and discharging mode of each energy storage unit in the large-scale energy storage power station, and determines whether each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command based on the charging and discharging information of each energy storage unit. In one specific embodiment of this application, the power control system collects the charging and discharging information of each energy storage unit according to the charging and discharging mode of each energy storage unit in the large-scale energy storage power station, and determines whether each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command based on the charging and discharging information of each energy storage unit. This includes: when it is determined that each energy storage unit in the large-scale energy storage power station is in discharge mode, the power control system collects the discharge information of each energy storage unit, including the device status, discharge SOC value, and discharge power limit value; when the device status in the discharge information of each energy storage unit is in discharge operation mode, the discharge SOC value is greater than the preset lower limit value, and the discharge power limit value is greater than 0, then the power control system determines... If, under the overall target command, each energy storage unit meets the discharge power allocation operation conditions; or if the device status in the discharge information of any energy storage unit is not in discharge operation state, the discharge SOC value is greater than the preset lower limit of SOC value and the discharge power limit value is greater than 0, or if the device status in the discharge information of any energy storage unit is in discharge operation state, the discharge SOC value is not greater than the preset lower limit of SOC value and the discharge power limit value is greater than 0, or if the device status in the discharge information of any energy storage unit is in discharge operation state, the discharge SOC value is greater than the preset lower limit of SOC value and the discharge power limit value is not greater than 0, then the power control system determines that each energy storage unit does not meet the discharge power allocation operation conditions under the overall target command.

[0024] In one specific embodiment of this application, the power control system collects the charging and discharging information of each energy storage unit according to the charging and discharging mode of each energy storage unit in the large-scale energy storage power station, and determines whether each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command based on the charging and discharging information of each energy storage unit. This includes: when it is determined that each energy storage unit in the large-scale energy storage power station is in charging mode, the power control system collects charging information of each energy storage unit, including device status, charging SOC value, and charging power limit value; when the device status in the charging information of each energy storage unit is charging operation status, the charging SOC value is less than the preset SOC upper limit value, and the charging power limit value is greater than 0, then the power control system determines... The power control system determines that each energy storage unit does not meet the charging power allocation operation conditions under the overall target command. If the device status in the charging information of any energy storage unit is not in charging operation state, the charging SOC value is less than the preset SOC upper limit value, and the charging power limit value is greater than 0; or if the device status in the charging information of any energy storage unit is in charging operation state, the charging SOC value is not less than the preset SOC upper limit value, and the charging power limit value is greater than 0; or if the device status in the charging information of any energy storage unit is in charging operation state, the charging SOC value is less than the preset SOC upper limit value, and the charging power limit value is not greater than 0, then the power control system determines that each energy storage unit does not meet the charging power allocation operation conditions under the overall target command.

[0025] Step S103: When it is determined that each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target instruction, the power control system calculates the charging and discharging power value of each energy storage unit in sequence according to the charging and discharging information of each energy storage unit and the overall target instruction, and sends the calculated charging and discharging power value to the corresponding energy storage unit to realize the power allocation of the large-scale energy storage power station.

[0026] In one specific embodiment of this application, when it is determined that each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target instruction, the power control system calculates the charging and discharging power value of each energy storage unit sequentially based on the charging and discharging information of each energy storage unit and the overall target instruction. This includes: when it is determined that each energy storage unit meets the discharging power allocation operation conditions under the overall target instruction, the power control system calculates the discharging power allocation weight of each energy storage unit sequentially based on the discharging SOC value in the discharging information of each energy storage unit; when allocating the discharging power value to the current energy storage unit, the power control system calculates the current remaining available discharging power value in the overall target instruction based on the overall target power value in the overall target instruction and the discharging power value already allocated to the previous energy storage units; the power control system calculates the discharging power value to be allocated to the current energy storage unit based on the discharging power allocation weight of the current energy storage unit and the current remaining available discharging power value, and compares the discharging power value to be allocated to the current energy storage unit with a preset discharging power limit value, selecting the smaller value as the discharging power value of the current energy storage unit.

[0027] In one specific embodiment of this application, when it is determined that each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target instruction, the power control system calculates the charging and discharging power value of each energy storage unit sequentially based on the charging and discharging information of each energy storage unit and the overall target instruction. This includes: when it is determined that each energy storage unit meets the charging power allocation operation conditions under the overall target instruction, the power control system calculates the charging power allocation weight of each energy storage unit sequentially based on the charging SOC value in the charging information of each energy storage unit; when allocating the charging power value to the current energy storage unit, the power control system calculates the current remaining available charging power value in the overall target instruction based on the overall target power value in the overall target instruction and the charging power values ​​already allocated to the previous energy storage units; the power control system calculates the charging power value to be allocated to the current energy storage unit based on the charging power allocation weight of the current energy storage unit and the current remaining available charging power value, and compares the charging power value to be allocated to the current energy storage unit with a preset charging power limit value, selecting the larger value as the charging power value of the current energy storage unit.

[0028] This application also includes: step S104: when it is determined that any energy storage unit does not meet the charging and discharging power allocation operation conditions under the total target command, the power control system sets the charging and discharging power value to 0 and sends it to the energy storage unit that does not meet the charging and discharging power allocation operation conditions.

[0029] This application monitors the device status, SOC, charging and discharging power limits, and set upper and lower limits of each energy storage unit in real time, calculates the power allocation weight of each energy storage unit in real time, and allocates the charging and discharging power of the corresponding energy storage unit according to the power allocation weight of each energy storage unit.

[0030] Figure 2 This is a schematic diagram of the power control system and each energy storage unit provided in one embodiment of this application, as shown below. Figure 2 As shown, it includes a power controller and n energy storage units. The power controller is set in the power control system and includes a main control unit containing a power calculation unit and a communication unit. Each energy storage unit includes a communication unit and a main control unit.

[0031] First, the power controller collects information from each energy storage unit through the communication unit, including the energy storage unit's SOC, the energy storage unit's charge and discharge power limit value, and the energy storage unit's operating status. Then, the power controller uses the collected information from each energy storage unit and the power calculation unit in the main control module to calculate the power value allocated to each energy storage unit. It then compares the calculated power value allocated to each energy storage unit with its corresponding charge and discharge power limit value. Finally, it selects the appropriate power value from the comparison results and sends the power command to each energy storage unit through the communication unit.

[0032] Furthermore, the main function of the power calculation unit in the main control unit of the power controller is to calculate the power command that should be allocated to each energy storage unit based on the collected information of each energy storage unit, including SOC, equipment operating status, and charging and discharging power limit values.

[0033] The following is combined with Figures 3-6 The power allocation method for large-scale energy storage power stations provided in the embodiments of this application will be further explained and described, specifically including the following steps: Step 1: Input parameters and commands, including the device status (PCS operating status) of each energy storage unit, SOC, charge / discharge power limits, set upper and lower limits of SOC, and energy storage target commands, such as... Figure 3 As shown; Step 2: Determine the charging / discharging mode based on the target command. If the target command is greater than 0, determine it as discharging mode; if the target command is less than 0, determine it as charging mode. Figure 4 As shown; Step 3: When the system is determined to be in discharge mode, perform power allocation for the discharge mode, such as... Figure 5 As shown, it specifically includes the following: Step 31: In discharge mode, if the first energy storage unit is in operation, and its SOC is greater than the lower SOC limit, and the energy storage unit's discharge power limit is greater than 0, then power allocation calculation is performed; otherwise, the power command for the first energy storage unit is set to 0. The power allocation calculation method for the first unit is as follows: Energy storage unit command[1] = MIN(energy storage unit discharge power limit[1], total target command × SOC[1] / SOC sum).

[0034] Among them, the sum of SOC[1] / SOC is the discharge power allocation weight of the first energy storage unit.

[0035] Step 32: After the first energy storage unit's command allocation is completed, the command allocation for the second energy storage unit is performed. If the second energy storage unit is in operation, and its State of Charge (SOC) is greater than the lower SOC limit, and its discharge power limit is greater than 0, then power allocation calculation is performed; otherwise, the power command for the second energy storage unit is set to 0. The power allocation calculation method for the second unit is as follows: Energy storage unit command[2] = MIN(energy storage unit discharge power limit[2], (total target command - energy storage unit command[1]) × SOC[2] / (sum of SOC - SOC[1]) Among them, SOC[2] / (Sum of SOCs - SOC[1]) is the discharge power allocation weight of the second energy storage unit.

[0036] Step 33: Perform command allocation for the i-th energy storage unit. If the i-th energy storage unit is in operation, and its SOC is greater than the lower limit of SOC, and the discharge power limit of the energy storage unit is greater than 0, then power allocation calculation is performed; otherwise, the power command for the i-th energy storage unit is set to 0. The power allocation calculation method for the i-th unit is as follows: Where N is the total number of energy storage units, and i is the currently allocated energy storage unit number.

[0037] in, Assign weights to the discharge power of the i-th energy storage unit.

[0038] Step 4: When the system is determined to be in charging mode, power allocation for the charging mode is performed, such as... Figure 6 As shown, it specifically includes the following: Step 41: Charging mode is only allowed. If the first energy storage unit is in operation, and its SOC is less than the upper limit, and the charging power limit of the energy storage unit is greater than 0, then power allocation calculation is performed; otherwise, the power command of the first energy storage unit is set to 0. The power allocation calculation method for the first unit is as follows: Energy storage unit command[1] = MAX(-energy storage unit discharge power limit[1], total target command × (100-SOC[1]) / (100-SOC) sum) Among them, the sum of 100-SOC[1]) / (100-SOC) is the charging power allocation weight of the first energy storage unit.

[0039] Step 42: After the first energy storage unit's command allocation is completed, the command allocation for the second energy storage unit is performed. If the second energy storage unit is in operation, and its SOC is less than the upper limit of SOC, and the energy storage unit's charging power limit is greater than 0, then power allocation calculation is performed; otherwise, the power command for the second energy storage unit is set to 0. The power allocation calculation method for the second unit is as follows: Energy storage unit command[2] = MAX(-energy storage unit charging power limit[2], (total target command-energy storage unit command[1])×(100-SOC[2]) / ((100-SOC) sum-(100-SOC[1])) Among them, 100-SOC[2]) / ((100-SOC) sum-(100-SOC[1]) is the charging power allocation weight of the second energy storage unit.

[0040] Step 43: Perform command allocation for the i-th energy storage unit. If the i-th energy storage unit is in operation, its SOC is less than the upper limit, and its charging power limit is greater than 0, then power allocation calculation is performed; otherwise, the power command for the i-th energy storage unit is set to 0. The power allocation calculation method for the i-th unit is as follows: Where N is the total number of energy storage units, and i is the currently allocated energy storage unit number.

[0041] in, Assign weights to the charging power of the i-th energy storage unit.

[0042] In summary, the power allocation method for large-scale energy storage power stations provided in this application specifically includes: 1. Determining the operating mode of the current target command based on the target command: charging mode or discharging mode; 2. Determining whether each energy storage unit meets the operating conditions under the current target command based on the collected status of each unit's equipment, SOC, charging and discharging power limits, and set upper and lower limits of SOC; 3. Calculating the power allocation weight based on the collected information of each energy storage unit; 4. Allocating power to each energy storage unit according to its power allocation weight. This ensures the balance of energy capacity among the energy storage units during the power allocation process in a large-scale energy storage power station. Simultaneously, by limiting the commands allocated to each unit, it avoids battery overcurrent and overcharging / over-discharging.

[0043] After the power control system sends the calculated charging and discharging power value to the corresponding energy storage unit, this application also includes an operation step of controlling the power of the photovoltaic-energy storage system. Specifically, this includes: determining the current charging and discharging state of the photovoltaic-energy storage system and setting the maximum power generation value of the photovoltaic system in the photovoltaic-energy storage system; monitoring the charging and discharging power value of the energy storage system and the power value of the grid connection point in real time during the current charging and discharging state of the photovoltaic-energy storage system; and adjusting the real-time monitored charging and discharging power value of the energy storage system and the power value of the grid connection point until the energy storage system reaches the maximum charging and discharging power value.

[0044] Specifically, in the current charging and discharging state of the photovoltaic-storage system, real-time monitoring of the charging and discharging power values ​​of the energy storage system and the power value of the grid connection point includes: in the current discharging state of the photovoltaic-storage system, real-time monitoring of the discharging power value of the energy storage system and the active power value of the grid connection point; and in the current charging state of the photovoltaic-storage system, real-time monitoring of the charging power value of the energy storage system and the apparent power value of the grid connection point.

[0045] The process of adjusting the monitored charging and discharging power values ​​of the energy storage system and the power value of the grid connection point until the energy storage system reaches its maximum charging and discharging power value includes: real-time monitoring of the discharge power value of the energy storage system and the active power value of the grid connection point during the process of increasing the charging and discharging power of the energy storage system according to a preset first gradient while the system is currently in its discharge state; obtaining a first comparison result by comparing the real-time monitored discharge power value of the energy storage system with the maximum discharge power value; obtaining a second comparison result by comparing the real-time monitored active power value of the grid connection point with a preset inverse power threshold value; and adjusting the discharge power value of the energy storage system and the power value of the grid connection point according to the first and second comparison results until the energy storage system reaches its maximum discharge power value.

[0046] The adjustment of the discharge power value of the energy storage system and the power value of the grid connection point based on the first comparison result and the second comparison result until the energy storage system reaches the maximum discharge power value includes: if the first comparison result is that the discharge power value of the energy storage system is less than the maximum discharge power value, and the second comparison result is that the active power value of the grid connection point is not greater than a preset reverse power threshold, then the energy storage system is controlled to lower the discharge power value until the active power value of the grid connection point is greater than the preset reverse power threshold; after the active power value of the grid connection point is greater than the preset reverse power threshold, the energy storage system is controlled to raise the discharge power value until the energy storage system reaches the maximum discharge power value.

[0047] The process of adjusting the monitored charging and discharging power values ​​of the energy storage system and the power value of the grid connection point until the energy storage system reaches its maximum charging and discharging power value includes: real-time monitoring of the charging power value of the energy storage system and the apparent power value of the grid connection point during the process of increasing the charging power of the energy storage system according to a preset second gradient while it is currently in the charging state; obtaining a third comparison result by comparing the real-time monitored charging power value of the energy storage system with the maximum charging power value; simultaneously comparing the real-time monitored apparent power value of the grid connection point with a preset transformer overload threshold value to obtain a fourth comparison result; and adjusting the charging power value of the energy storage system and the power value of the grid connection point according to the third and fourth comparison results until the energy storage system reaches its maximum charging power value.

[0048] The adjustment of the charging power value of the energy storage system and the power value of the grid connection point based on the third comparison result and the fourth comparison result until the energy storage system reaches the maximum charging power value includes: if the third comparison result is that the charging power value of the energy storage system is less than the maximum charging power value, and the second comparison result is that the apparent power value of the grid connection point is not less than a preset transformer overload threshold, then the energy storage system is controlled to lower the charging power value until the apparent power value of the grid connection point is less than the preset transformer overload threshold; after the apparent power value of the grid connection point is less than the preset transformer overload threshold, the energy storage system is controlled to raise the charging power value until the energy storage system reaches the maximum charging power value.

[0049] Furthermore, after determining the current charging state of the photovoltaic-energy storage system, the method further includes: real-time monitoring of the actual power generation value of the photovoltaic system during the current charging period, and real-time adjustment of the maximum charging power value of the energy storage system based on the actual power generation value of the photovoltaic system.

[0050] This application also provides embodiments of power distribution devices suitable for large-scale energy storage power plants. Figure 7 This is a schematic diagram of the structure of a power distribution device suitable for large-scale energy storage power stations, provided in one embodiment of this application. Figure 7As shown, the device is applied to a power control system, which includes: a determination module configured to determine the charging and discharging mode of each energy storage unit in a large-scale energy storage power station according to a general target instruction; a data acquisition and judgment module configured to acquire the charging and discharging information of each energy storage unit according to the charging and discharging mode of each energy storage unit in the large-scale energy storage power station, and determine whether each energy storage unit meets the charging and discharging power allocation operation conditions under the general target instruction based on the charging and discharging information of each energy storage unit; and a power allocation module configured to, when it is determined that each energy storage unit meets the charging and discharging power allocation operation conditions under the general target instruction, calculate the charging and discharging power value of each energy storage unit in sequence according to the charging and discharging information of each energy storage unit and the general target instruction, and send the calculated charging and discharging power value to the corresponding energy storage unit to realize the power allocation of the large-scale energy storage power station.

[0051] The above is a schematic scheme of a power distribution device suitable for large-scale energy storage power stations according to this embodiment. It should be noted that the technical solution of the power distribution device suitable for large-scale energy storage power stations and the technical solution of the power distribution method suitable for large-scale energy storage power stations described above belong to the same concept. For details not described in detail in the technical solution of the power distribution device suitable for large-scale energy storage power stations, please refer to the description of the technical solution of the power distribution method suitable for large-scale energy storage power stations described above.

[0052] Figure 8 A structural block diagram of a computing device 800 according to an embodiment of this application is shown. The components of the computing device 800 include, but are not limited to, a memory 810 and a processor 820. The processor 820 is connected to the memory 810 via a bus 830, and a database 850 is used to store data.

[0053] The computing device 800 also includes an access device 840, which enables the computing device 800 to communicate via one or more networks 860. Examples of these networks include a Public Switched Telephone Network (PSTN), a Local Area Network (LAN), a Wide Area Network (WAN), a Personal Area Network (PAN), or a combination of communication networks such as the Internet. The access device 840 may include one or more of any type of wired or wireless network interface (e.g., a Network Interface Card (NIC)), such as an IEEE 802.11 Wireless Local Area Network (WLAN) interface, a Wi-MAX interface, an Ethernet interface, a Universal Serial Bus (USB) interface, a cellular network interface, a Bluetooth interface, a Near Field Communication (NFC) interface, and so on.

[0054] In one embodiment of this application, the aforementioned components of the computing device 800 and Figure 8Other components, not shown, can also be connected to each other, for example, via a bus. It should be understood that... Figure 8 The block diagram of the computing device shown is for illustrative purposes only and is not intended to limit the scope of this application. Those skilled in the art can add or replace other components as needed.

[0055] The computing device 800 can be any type of stationary or mobile computing device, including mobile computers or mobile computing devices (e.g., tablet computers, personal digital assistants, laptop computers, notebook computers, netbooks, etc.), mobile phones (e.g., smartphones), wearable computing devices (e.g., smartwatches, smart glasses, etc.) or other types of mobile devices, or stationary computing devices such as desktop computers or PCs. The computing device 800 can also be a mobile or stationary server.

[0056] The processor 820 is configured to execute the following computer-executable instructions, which, when executed by the processor, implement the steps of the power allocation method applicable to large-scale energy storage power plants described above.

[0057] The above is a schematic representation of a computing device according to this embodiment. It should be noted that the technical solution of this computing device belongs to the same concept as the power allocation method applicable to large-scale energy storage power stations described above. For details not described in detail in the technical solution of the computing device, please refer to the description of the power allocation method applicable to large-scale energy storage power stations described above.

[0058] An embodiment of this application also provides a computer-readable storage medium storing computer-executable instructions that, when executed by a processor, implement the steps of the power allocation method applicable to large-scale energy storage power plants described above.

[0059] The above is an illustrative scheme of a computer-readable storage medium according to this embodiment. It should be noted that the technical solution of this storage medium belongs to the same concept as the technical solution of the power allocation method applicable to large-scale energy storage power stations described above. For details not described in detail in the technical solution of the storage medium, please refer to the description of the technical solution of the power allocation method applicable to large-scale energy storage power stations described above.

[0060] An embodiment of this application also provides a computer program, wherein when the computer program is executed in a computer, it causes the computer to perform the steps of the power distribution method applicable to large-scale energy storage power stations described above.

[0061] The above is an illustrative scheme of a computer program according to this embodiment. It should be noted that the technical solution of this computer program belongs to the same concept as the power allocation method for large-scale energy storage power stations described above. For details not described in detail in the technical solution of the computer program, please refer to the description of the power allocation method for large-scale energy storage power stations described above.

[0062] The foregoing has described specific embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired results. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0063] The computer instructions include computer program code, which may be in the form of source code, object code, executable file, or certain intermediate forms. The computer-readable medium may include any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium may be appropriately added to or subtracted according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media may not include electrical carrier signals and telecommunication signals.

[0064] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that the embodiments of this application are not limited to the described order of actions, because according to the embodiments of this application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the embodiments of this application.

[0065] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0066] The preferred embodiments disclosed above are merely illustrative of this application. The optional embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the embodiments of this application. These embodiments are selected and specifically described in this application to better explain the principles and practical applications of the embodiments of this application, thereby enabling those skilled in the art to better understand and utilize this application. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A power allocation method suitable for large-scale energy storage power stations, characterized in that, include: The power control system determines the charging and discharging modes of each energy storage unit in the large-scale energy storage power station based on the overall target instructions. The power control system collects the charging and discharging information of each energy storage unit according to the charging and discharging mode of each energy storage unit in the large-scale energy storage power station, and determines whether each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command based on the charging and discharging information of each energy storage unit. When it is determined that each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target instruction, the power control system calculates the charging and discharging power value of each energy storage unit in sequence according to the charging and discharging information of each energy storage unit and the overall target instruction, and sends the calculated charging and discharging power value to the corresponding energy storage unit to realize the power allocation of the large-scale energy storage power station.

2. The method according to claim 1, characterized in that, The power control system determines the charging and discharging modes of each energy storage unit in the large-scale energy storage power station according to the overall target instruction, including: The power control system compares the total target power value in the total target command with 0; If the total target power value in the total target instruction is greater than 0, then the power control system determines that each energy storage unit in the large-scale energy storage power station is in discharge mode; If the total target power value in the total target instruction is less than 0, then the power control system determines that each energy storage unit in the large-scale energy storage power station is in charging mode.

3. The method according to claim 2, characterized in that, The power control system collects charging and discharging information of each energy storage unit according to its charging and discharging mode in the large-scale energy storage power station, and determines whether each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command based on the charging and discharging information of each energy storage unit. When it is determined that each energy storage unit in a large-scale energy storage power station is in discharge mode, the power control system collects discharge information of each energy storage unit, including equipment status, discharge SOC value and discharge power limit value. When the device status in the discharge information of each energy storage unit is in discharge operation state, the discharge SOC value is greater than the preset lower limit of SOC value and the discharge power limit value is greater than 0, the power control system determines that each energy storage unit meets the discharge power allocation operation conditions under the overall target command. If the device status in the discharge information of any energy storage unit is not in discharge operation state, the discharge SOC value is greater than the preset lower limit of SOC value and the discharge power limit value is greater than 0, or if the device status in the discharge information of any energy storage unit is in discharge operation state, the discharge SOC value is not greater than the preset lower limit of SOC value and the discharge power limit value is greater than 0, or if the device status in the discharge information of any energy storage unit is in discharge operation state, the discharge SOC value is greater than the preset lower limit of SOC value and the discharge power limit value is not greater than 0, then the power control system determines that each energy storage unit does not meet the discharge power allocation operation conditions under the overall target command.

4. The method according to claim 2, characterized in that, The power control system collects charging and discharging information of each energy storage unit according to its charging and discharging mode in the large-scale energy storage power station, and determines whether each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command based on the charging and discharging information of each energy storage unit. When it is determined that each energy storage unit in a large-scale energy storage power station is in charging mode, the power control system collects charging information for each energy storage unit, including equipment status, charging SOC value and charging power limit value. When the device status in the charging information of each energy storage unit is charging operation status, the charging SOC value is less than the preset SOC upper limit value and the charging power limit value is greater than 0, the power control system determines that each energy storage unit meets the charging power allocation operation conditions under the overall target command. If the device status in the charging information of any energy storage unit is not in charging operation state, the charging SOC value is less than the preset SOC upper limit value and the charging power limit value is greater than 0, or if the device status in the charging information of any energy storage unit is in charging operation state, the charging SOC value is not less than the preset SOC upper limit value and the charging power limit value is greater than 0, or if the device status in the charging information of any energy storage unit is in charging operation state, the charging SOC value is less than the preset SOC upper limit value and the charging power limit value is not greater than 0, then the power control system determines that each energy storage unit does not meet the charging power allocation operation conditions under the overall target command.

5. The method according to claim 3, characterized in that, When it is determined that each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command, the power control system calculates the charging and discharging power value of each energy storage unit sequentially based on the charging and discharging information of each energy storage unit and the overall target command, including: When it is determined that each energy storage unit meets the discharge power allocation operation conditions under the overall target command, the power control system calculates the discharge power allocation weight of each energy storage unit in sequence according to the discharge SOC value in the discharge information of each energy storage unit. When allocating discharge power to the current energy storage unit, the power control system calculates the current remaining available discharge power value in the overall target instruction based on the overall target power value in the overall target instruction and the discharge power values ​​already allocated to the previous energy storage units. The power control system calculates the discharge power value to be allocated to the current energy storage unit based on the discharge power allocation weight of the current energy storage unit and the current remaining available discharge power value. It then compares the discharge power value to be allocated to the current energy storage unit with a preset discharge power limit value and selects the smaller value as the discharge power value of the current energy storage unit.

6. The method according to claim 4, characterized in that, When it is determined that each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command, the power control system calculates the charging and discharging power value of each energy storage unit sequentially based on the charging and discharging information of each energy storage unit and the overall target command, including: When it is determined that each energy storage unit meets the charging power allocation operation conditions under the overall target command, the power control system calculates the charging power allocation weight of each energy storage unit in turn based on the charging SOC value in the charging information of each energy storage unit. When allocating charging power to the current energy storage unit, the power control system calculates the current remaining available charging power value in the total target instruction based on the total target power value in the total target instruction and the charging power values ​​already allocated to the previous energy storage units. The power control system calculates the charging power value to be allocated to the current energy storage unit based on the charging power allocation weight of the current energy storage unit and the current remaining available charging power value. It then compares the charging power value to be allocated to the current energy storage unit with a preset charging power limit value and selects the larger value as the charging power value of the current energy storage unit.

7. The method according to claim 1, characterized in that, Also includes: When it is determined that any energy storage unit does not meet the charging and discharging power allocation operation conditions under the overall target command, the power control system sets the charging and discharging power value to 0 and sends it to the energy storage unit that does not meet the charging and discharging power allocation operation conditions.

8. A power distribution device suitable for large-scale energy storage power stations, applied to a power control system, characterized in that, The power control system includes: The determination module is configured to determine the charging and discharging modes of each energy storage unit in a large-scale energy storage power station based on the overall target instructions. The data acquisition and judgment module is configured to acquire the charging and discharging information of each energy storage unit according to the charging and discharging mode of each energy storage unit in the large-scale energy storage power station, and determine whether each energy storage unit meets the charging and discharging power allocation operation conditions under the overall target command based on the charging and discharging information of each energy storage unit. The power distribution module is configured such that when it is determined that each energy storage unit meets the charging and discharging power distribution operation conditions under the overall target instruction, the power control system calculates the charging and discharging power value of each energy storage unit in sequence according to the charging and discharging information of each energy storage unit and the overall target instruction, and sends the calculated charging and discharging power value to the corresponding energy storage unit, so as to realize the power distribution of the large-scale energy storage power station.

9. A computing device, comprising: Memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions, which, when executed by the processor, implement the steps of the power allocation method applicable to large-scale energy storage power stations as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing computer-executable instructions that, when executed by a processor, implement the steps of the power distribution method for a large-scale energy storage power station as described in any one of claims 1 to 7.

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