Three-phase parallel system and power distribution method and apparatus therefor

Abstract

The present application relates to the technical field of energy storage systems. Disclosed are a three-phase parallel system and a power distribution method and apparatus therefor. The method comprises: acquiring an initial distributed power of each phase of each energy storage inverter; on the basis of the initial distributed power of each phase of each energy storage inverter, determining a locked phase and an unlocked phase, and a locked energy storage inverter and an unlocked energy storage inverter; on the basis of the locked energy storage inverter and the locked phase, determining a missing power of the locked phase of the locked energy storage inverter; on the basis of the initial distributed power of the unlocked phase of the locked energy storage inverter, obtaining a charging margin; on the basis of the initial distributed power of the unlocked phase of the unlocked energy storage inverter, obtaining a discharging margin; and on the basis of the missing power, the charging margin, and the discharging margin, obtaining a target distributed power of each phase of each energy storage inverter. By means of overall calculation of global margins, the problems of rigid inter-phase power distribution and single-point bottleneck constraints on the overall performance in conventional parallel systems are solved, thereby significantly improving the load adaptability and operational reliability of the parallel system.

Description

Three-phase parallel operation system and its power distribution method and device

[0001] Cross-reference of related applications

[0002] This application claims priority to Chinese Patent Application No. 202510358134.9, filed on March 25, 2025, entitled “Three-phase parallel system and power distribution method and apparatus thereof”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of energy storage system technology, and in particular to three-phase parallel systems and their power distribution methods and devices. Background Technology

[0004] With the rapid development of the energy storage industry, especially the widespread adoption of home energy storage products, more and more users are relying on energy storage products to provide power to their home loads. Particularly in parallel operation, achieving load matching between energy storage inverters to ensure stable power supply has become a key technological challenge.

[0005] Existing technical solutions mainly include three load distribution methods for parallel systems: first, sequential phase-by-phase load sharing, where each inverter connects to the load sequentially according to the phase sequence of the power system, thereby ensuring balanced load distribution; second, evenly distributed load sharing, where multiple inverters share the load, resulting in uniform power distribution; and third, proportional load sharing based on the state of charge (SOC) of the energy storage units. These three solutions can optimize the discharge of energy storage batteries and the power output of inverters to a certain extent, improving the overall system efficiency. However, when the discharge capacity of energy storage batteries within a parallel system differs too much, it can cause the system to fail to achieve full load matching, which remains a challenge for current technology.

[0006] Application content

[0007] The embodiments of this application mainly address the technical problem of how to reasonably and comprehensively allocate power to match the load.

[0008] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a power distribution method for a three-phase parallel system, wherein the three-phase parallel system includes at least two energy storage inverters, and the method includes: obtaining the initial power distribution of each phase of each of the energy storage inverters; determining the locked phase and the unlocked phase based on the initial power distribution of each phase of each of the energy storage inverters; and determining the locked energy storage inverter and the unlocked energy storage inverter based on the initial power distribution of each phase of each of the energy storage inverters and the discharge limit of the energy storage battery corresponding to each energy storage inverter. Based on the locked energy storage inverter and the locked phase, determine the missing power of the locked phase of the locked energy storage inverter; based on the initial power allocation of the unlocked phase of the locked energy storage inverter, obtain the charging margin; based on the initial power allocation of the unlocked phase of the unlocked energy storage inverter, obtain the discharging margin; based on the missing power, the charging margin, and the discharging margin, obtain the target power allocation of each phase of each of the energy storage inverters; based on the target power allocation of each phase of each of the energy storage inverters, perform power output to match the load.

[0009] In some embodiments, determining the locked-in phase and the unlocked phase based on the initial power allocation of each phase of each of the energy storage inverters includes: obtaining the corresponding load power; calculating the total output power of each phase based on the initial power allocation of each phase of each of the energy storage inverters; comparing the total output power of each phase with the corresponding load power; defining the phase whose total output power is less than the corresponding load power as the locked-in phase; otherwise, defining it as the unlocked phase.

[0010] In some embodiments, determining a locked-in energy storage inverter and an unlocked energy storage inverter based on the initial power allocation of each phase of each of the energy storage inverters and the discharge limit of the energy storage battery corresponding to each energy storage inverter includes: calculating the total three-phase output power of each energy storage inverter based on the initial power allocation of each phase of each of the energy storage inverters; defining an energy storage inverter whose total three-phase output power is equal to the discharge limit of the energy storage battery as a locked-in energy storage inverter; and defining an energy storage inverter whose total three-phase output power is less than the discharge limit of the energy storage battery as an unlocked energy storage inverter.

[0011] In some embodiments, determining the missing power of the locked phase of the locked energy storage inverter based on the locked energy storage inverter and the locked phase includes: obtaining the sum of the initial allocated power of the unlocked energy storage inverters in the locked phase; the difference between the load power corresponding to the locked phase and the sum of the initial allocated power of the unlocked energy storage inverters in the locked phase is the sum of missing power; and determining the missing power of the locked phase of each locked energy storage inverter based on the sum of missing power, the number of locked energy storage inverters, and the maximum allowable discharge power.

[0012] In some embodiments, obtaining the charging margin based on the initial power allocation of the unlocked phase of the locked energy storage inverter includes: determining whether the initial power allocation of the unlocked phase in the locked energy storage inverter is zero; if the initial power allocation of the unlocked phase is not zero, it indicates that the unlocked phase is used to supply power to the load, and it is determined that the unlocked phase cannot be charged; if the initial power allocation of the unlocked phase is zero, it indicates that the unlocked phase is not used to supply power to the load, and it is determined that the unlocked phase is a rechargeable phase; and obtaining the maximum allowable charging power of the rechargeable phase in the locked energy storage inverter as the charging margin.

[0013] In some embodiments, obtaining the discharge margin based on the initial power allocation of the unlocked phase of the unlocked energy storage inverter includes: obtaining the discharge limit of the energy storage battery corresponding to the unlocked energy storage inverter and the maximum allowable discharge power of the unlocked phase of the unlocked energy storage inverter; and calculating the discharge margin based on the discharge limit of the energy storage battery corresponding to the unlocked energy storage inverter, the maximum allowable discharge power of the unlocked phase of the unlocked energy storage inverter, and the initial power allocation.

[0014] In some embodiments, obtaining the target allocated power for each phase of each of the energy storage inverters based on the missing power, the charging margin, and the discharging margin includes: determining the unlocked phase in the unlocked energy storage inverter used for power dispatch based on the discharging margin and the missing power, and obtaining a first dispatch power for the unlocked phase in the unlocked energy storage inverter used for power dispatch; determining the unlocked phase in the locked energy storage inverter used for power dispatch based on the charging margin and the missing power, and obtaining a second dispatch power for the unlocked phase in the locked energy storage inverter used for power dispatch; and obtaining the target allocated power for each phase of each of the energy storage inverters based on the missing power, the first dispatch power, and the second dispatch power.

[0015] In some embodiments, determining the unlocked phase in the locked energy storage inverter used for power scheduling based on the charging margin and the missing power, and obtaining the second scheduling power of the unlocked phase in the locked energy storage inverter used for power scheduling, includes: obtaining the load power corresponding to the unlocked phase in the locked energy storage inverter used for power scheduling and the discharge limit of the energy storage battery corresponding to the unlocked energy storage inverter; and obtaining the second scheduling power based on the first scheduling power, the load power, and the discharge limit of the energy storage battery.

[0016] To solve the above-mentioned technical problems, another technical solution adopted in this application is: providing a power distribution device for a three-phase parallel system, the three-phase parallel system including at least two energy storage inverters, the device including: an acquisition module, the acquisition module being used to acquire the initial power distribution of each phase of each of the energy storage inverters; a first confirmation module, the first confirmation module being used to determine the locked phase and the unlocked phase based on the initial power distribution of each phase of each of the energy storage inverters; a second confirmation module, the second confirmation module being used to determine the locked energy storage inverter and the unlocked energy storage inverter based on the initial power distribution of each phase of each of the energy storage inverters and the discharge limit of the energy storage battery corresponding to each energy storage inverter; and a missing power calculation module, the missing power calculation module being used to calculate the initial power distribution of each phase of each of the energy storage inverters and the discharge limit of the energy storage battery corresponding to each energy storage inverter; and a missing power calculation module, the missing power calculation module being used to calculate the initial power distribution of each phase of each of the energy storage inverters and the discharge limit of the energy storage battery corresponding to each energy storage inverter. The system comprises: a locked energy storage inverter and its locked phase, determining the missing power of the locked phase of the locked energy storage inverter; a charging margin calculation module, used to obtain the charging margin based on the initial power allocation of the unlocked phase of the locked energy storage inverter; a discharging margin calculation module, used to obtain the discharging margin based on the initial power allocation of the unlocked phase of the unlocked energy storage inverter; a power scheduling calculation module, used to obtain the target power allocation for each phase of each energy storage inverter based on the missing power, the charging margin, and the discharging margin; and a power allocation module, used to perform power output to match the load based on the target power allocation for each phase of each energy storage inverter.

[0017] To solve the above-mentioned technical problems, another technical solution adopted in the embodiments of this application is: to provide a three-phase parallel system, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed 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 perform the method described above.

[0018] To solve the above-mentioned technical problems, another technical solution adopted in the embodiments of this application is: to provide a non-volatile computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a three-phase parallel system, the three-phase parallel system performs the method described above.

[0019] To solve the above-mentioned technical problems, another technical solution adopted in the embodiments of this application is: to provide a computer program product, the computer program product including a computer program stored on a non-volatile computer-readable storage medium, the computer program including program instructions, which, when executed by a three-phase parallel system, cause the three-phase parallel system to perform the method described above.

[0020] Unlike related technologies, this application provides a three-phase parallel system and its power allocation method and device. 1. It adopts a multi-stage progressive calculation process of "initial allocation → locked phase / locked energy storage inverter → margin redistribution," overcoming the limitations of traditional single-step allocation in handling multi-phase load changes by acquiring key parameters such as load power, charging margin, discharging margin, and missing power in real time, combined with a dynamic adjustment mechanism. 2. Based on the initial allocated power, the locked phase is determined by combining it with the load power, and the locked energy storage inverter is selected by combining it with the discharge limit of the energy storage battery, achieving precise location of system bottlenecks and providing a decision-making basis for subsequent cross-phase compensation. 3. It proposes a joint calculation of charging margin (the remaining amount of the unlocked phase of the locked energy storage inverter) and discharging margin (the additional power that the unlocked inverter can generate), compensating for the missing power of the locked phase through margin redistribution, breaking through the limitations of traditional independent allocation within the same phase, allowing the energy storage inverter to dynamically allocate power between different phases, and realizing energy interaction between the three phases. 4. By comprehensively calculating the global margin, the system coordinates the cross-phase power scheduling among multiple energy storage inverters, avoiding single-unit overload while maximizing the overall load capacity of the system. This solves the problems of rigid inter-phase power and single-point bottlenecks that restrict the overall performance of traditional parallel systems, and significantly improves the load adaptability and operational reliability of the parallel system. Attached Figure Description

[0021] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0022] Figure 1 is a schematic block diagram of a three-phase parallel system provided in an embodiment of this application;

[0023] Figure 2 is a flowchart of a power distribution method for a three-phase parallel system provided in an embodiment of this application;

[0024] Figure 3 is a flowchart of a target power allocation calculation process provided in an embodiment of this application;

[0025] Figure 4 is a schematic block diagram of the power distribution device of a three-phase parallel system provided in an embodiment of this application;

[0026] Figure 5 is a schematic diagram of the hardware structure of a three-phase parallel system for implementing the power distribution method of a three-phase parallel system according to an embodiment of this application. Embodiments of the present invention

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0028] It should be noted that, unless otherwise specified, the various features in the embodiments of this application can be combined with each other, all of which are within the protection scope of this application. Furthermore, although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device schematic diagram or the order in the flowchart.

[0029] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0030] Please refer to Figure 1, which is a schematic block diagram of a three-phase parallel system provided in an embodiment of this application. As shown in Figure 1, the three-phase parallel system 100 includes multiple single-unit systems 10. Each single-unit system 10 is a standardized three-phase energy storage system, integrating energy storage batteries and energy storage inverters. Each subsystem achieves plug-and-play expansion capabilities through modular design. The AC side of the energy storage inverter of each single-unit system is connected to the common bus using low-impedance parallel connection technology, forming a multi-unit parallel power supply network, synchronously connected to the load end and the grid access point. Each single-unit system 10 establishes a real-time data exchange link with the upper-level energy management system (EMS) and the grid dispatch center through a dual-mode communication channel of power line carrier and CAN bus, realizing energy storage battery SOC status detection, inverter operating parameter synchronization, and dynamic perception of grid / load demand.

[0031] In this embodiment, the three-phase parallel system 100 includes at least two parallel single-unit systems 10, specifically three-phase energy storage systems. The energy storage inverters convert direct current (DC) to alternating current (AC) and vice versa. Each energy storage inverter can control the voltage and power output of its respective phases and adjust the charging and discharging state according to the needs of the energy storage battery. Each phase of each inverter has a corresponding maximum allowable charging / discharging power, which is mainly limited by the inverter hardware itself, such as the rated parameters of the power devices; when the inverter models are the same, the maximum allowable charging / discharging power of each phase of each inverter is the same. Each energy storage battery may contain multiple energy storage cells, and each energy storage cell has different discharge power limits and charging power limits depending on its SOC value.

[0032] The three-phase parallel system 100 has three core operating modes: energy storage priority mode, hybrid power supply mode, and grid charging mode. When the energy storage battery of the three-phase parallel system 100 has sufficient energy, it adopts energy storage priority mode, where the parallel system fully supplies power to the load. The grid plays an important auxiliary role in the three-phase parallel system 100, especially when the load demand exceeds the discharge capacity of the three-phase parallel system 100. In this case, the grid provides additional power, and the three-phase parallel system 100 adopts hybrid power supply mode. When the energy storage battery is low on power, the three-phase parallel system 100 automatically switches to grid charging mode. The grid provides power to the energy storage inverter to charge the battery, while simultaneously supplying power directly to the load. The inverter obtains AC power from the grid, converts it to DC power, and charges the battery, ensuring that the energy storage system has sufficient power to meet future load demands.

[0033] The power grid and the three-phase parallel system 100 work together to ensure a stable supply of load power. Through power dispatch algorithms, the power grid can supplement the energy storage system when necessary, or absorb excess power when the energy storage system outputs more than the load, preventing power waste.

[0034] In parallel systems, load matching is typically achieved through sequential or even-port matching of inverters, provided the total discharge limit of the Battery Management System (BMS) allows it. However, in certain special cases, even if the total discharge limit of the BMS in the parallel system is large enough to theoretically match load demand, significant differences in the State of Power (SOP) of the individual energy storage batteries within the system prevent the full utilization of their discharge capacity, thus failing to fully meet load requirements. In this situation, even if the total discharge limit is not exceeded, the limited discharge capacity of some energy storage batteries necessitates supplemental power from the grid for some loads. This is common in systems with uneven battery SOC or significant differences in discharge efficiency, requiring additional grid support during peak load periods. Ideally, users or developers would prefer that the load be entirely powered by the parallel system when the system's discharge power allows.

[0035] Therefore, please refer to Figure 2, which is a flowchart of a power distribution method for a three-phase parallel system provided in an embodiment of this application. As shown in Figure 2, the method is applied to the above-mentioned three-phase parallel system 100, and the method includes steps S101-S108:

[0036] S101: Obtain the initial power allocation for each phase of each energy storage inverter.

[0037] First, it is necessary to identify all energy storage inverters participating in the grid-connected system. These energy storage inverters are typically three-phase inverters capable of outputting three-phase AC power, and each inverter can allocate power to different phases (L1, L2, and L3). In this step, it is necessary to determine the basic information of these inverters, including their serial numbers, rated power, current load, status, and the power output capability of each phase.

[0038] Secondly, to obtain accurate initial power allocation, it is necessary to monitor the real-time operating status of each energy storage inverter, including the following aspects: Load information: Obtain the current load power of each phase of each inverter. For example, the load power corresponding to phases L1, L2, and L3 of inverter A. Discharge status: The discharge status of the inverter, i.e., the discharge capacity of the energy storage battery. If the inverter is charging, the discharge power is zero; if it is discharging, the output power of each phase of the inverter is recorded. Battery management system (BMS) information: Obtain information such as the battery's state of health (SOH), remaining battery charge (SOC), and charge / discharge power limits through the BMS. This helps in calculating the target output power of each phase of each inverter.

[0039] Secondly, each energy storage inverter will have an initial power allocation, which is called the initial power allocation before secondary power scheduling. Specifically, the initial power allocation refers to the power initially allocated to each phase of each inverter based on the current state of the energy storage battery, load demand, and the inverter's maximum allowable charging / discharging power, before optimized scheduling. The initial power allocation can be based on existing strategies such as phase-by-phase sequential load sharing, even load sharing, and SOC-based proportional load sharing.

[0040] The key to this step is to monitor and collect the load power of each phase, battery status (charge and discharge limits), and the inverter's maximum allowable charge / discharge power in real time, thereby performing the initial power allocation. Accurate acquisition of the initial allocated power lays the foundation for subsequent power scheduling, missing power calculation, and assessment of charging and discharging margins.

[0041] S102: Determine the locked-in phase and unlocked phase based on the initial power allocation of each phase of each energy storage inverter.

[0042] Based on the initial power allocation of each phase of each energy storage inverter, the locked-in phase and the unlocked-out phase are determined, including: obtaining the corresponding load power; calculating the total output power of each phase based on the initial power allocation of each phase of each energy storage inverter; comparing the total output power of each phase with the corresponding load power; defining the phase whose total output power is less than the corresponding load power as the locked-in phase; otherwise, it is the unlocked phase.

[0043] To determine phase lock-in, the load power corresponding to each phase (L1, L2, L3) must first be obtained. These load power values ​​are typically determined by the system's load requirements or external load conditions. Each load power represents the total power demand that the energy storage inverter needs to provide for each phase. For example, assuming the load power of phase L1 is 4 kW, this means that the total power demand of the energy storage inverter for phase L1 is 4 kW.

[0044] Secondly, the initial power allocation for each phase of each energy storage inverter is obtained. This means that the initial power allocation for each phase of each energy storage inverter refers to the power allocated by that inverter according to the currently set allocation strategy. The initial power allocation for each inverter depends on the battery state, load demand, and the inverter's output capability.

[0045] Next, calculate the total output power of each phase. This means calculating the total output power of each phase, which is the sum of the power allocated to that phase by each inverter. For example, for phase L1, assuming there are two inverters, inverter A initially allocates 2 kW to phase L1, and inverter B initially allocates 2 kW to phase L1, then the total output power of phase L1 is 4 kW.

[0046] Next, the total output power of each phase is compared with the load power. This means comparing the total output power of each phase with its corresponding load power. The comparison results are as follows: If the total output power of a phase is less than the load power, it means that the phase cannot meet the load demand and is considered a "locked-in phase," requiring it to enter a locked state. If the total output power of a phase is greater than or equal to the load power, then the phase can meet the load demand and is considered an "unlocked phase." For example, suppose the load power of phase L1 is 4 kW, and the total output power of phase L1 is 4 kW. Then phase L1 is an unlocked phase because its output power meets the load demand. If the load power of phase L1 is 4 kW, but the total output power of phase L1 is 3 kW, then phase L1 is a locked phase.

[0047] Finally, the locked phase is determined and its flag is output. It is understandable that the locked and unlocked phases can be determined by comparing the total output power and load power of each phase: if the total output power of a phase is less than the load power, the phase is locked. For example, if the total output power of phase L1 is 3 kW and the load power is 4 kW, then phase L1 is marked as locked (lockphase[1] = 1). Conversely, if the total output power of a phase is greater than or equal to the load power, it is unlocked. In practical applications, this comparison process can be implemented by programming to automatically check and set the locking status of each phase. Finally, the system will output the locking status of each phase. The purpose of marking the locked phase is to make corresponding power adjustments in subsequent power scheduling. The locked phase needs to borrow power from the unlocked phases of other inverters to balance the load demand.

[0048] This embodiment accurately calculates the total output power of each phase and compares it with the corresponding load power to precisely identify which phases cannot meet the load demand, thus determining the locked phase. Through the identification of the locked phase, the system can perform targeted power scheduling, allowing phases that cannot meet the load demand to borrow power from other phases. This avoids a decline in overall system performance due to insufficient local power, improving the load adaptability and efficiency of the three-phase parallel system.

[0049] S103: Determine the locked-in and unlocked energy storage inverters based on the initial power allocation of each phase of each energy storage inverter and the discharge limit of the corresponding energy storage battery of each energy storage inverter.

[0050] Based on the initial power allocation of each phase of each energy storage inverter and the discharge limit of the corresponding energy storage battery, lock-in and unlocked energy storage inverters are determined, including: calculating the total three-phase output power of each energy storage inverter based on the initial power allocation of each phase; defining energy storage inverters whose total three-phase output power is less than the discharge limit of the energy storage battery as unlocked energy storage inverters, and vice versa, as locked energy storage inverters.

[0051] First, based on the initial power allocation of each phase of each energy storage inverter, the total three-phase output power of each energy storage inverter is calculated. The initial power allocation data for each phase of all energy storage inverters has already been obtained in step S101. For example, if the initial power allocation of energy storage inverter A in phase L1 is 2 kW, in phase L2 is 0 kW, and in phase L3 is 2 kW, then the total three-phase output power of energy storage inverter A is 4 kW.

[0052] Secondly, obtain the discharge limit of the energy storage battery corresponding to each energy storage inverter. The discharge limit of an energy storage battery represents the maximum power or energy that the battery can provide from the stored electrical energy. The discharge limit of an energy storage battery is generally related to the battery's SOC, battery temperature, and SOH. The battery management system (BMS) of the energy storage battery will automatically calculate the corresponding discharge limit based on the above influencing factors. Typically, at low SOC, the BMS will actively limit the discharge current, resulting in a smaller discharge (power) limit; at medium to high SOC, the discharge (power) limit can usually reach the nominal value; at high SOC, the upper limit of the discharge (power) limit is not limited by SOC, but the charging (power) limit will decrease. At low battery temperatures (e.g., <0℃) and high battery temperatures (e.g., >45℃), the discharge power will be forcibly derated, i.e., the discharge limit will decrease. The lower the SOH, the lower the discharge limit will also be.

[0053] Next, compare the total three-phase output power of each energy storage inverter with the discharge limit of the corresponding energy storage battery. Energy storage inverters whose total three-phase output power equals the discharge limit of the energy storage battery are defined as locked energy storage inverters; those whose total three-phase output power is less than the discharge limit of the energy storage battery are defined as unlocked energy storage inverters. It can be understood that by comparing the total three-phase output power of each energy storage inverter with the discharge limit of the corresponding energy storage battery, it is possible to determine which energy storage batteries still have surplus power (remaining usable power) and which energy storage batteries have exhausted their power due to insufficient energy. Specifically: if the total three-phase output power of an energy storage inverter equals the discharge limit of its corresponding energy storage battery, then that energy storage inverter cannot provide any more surplus power and is marked as a locked energy storage inverter. If the total three-phase output power of an energy storage inverter is less than the discharge limit of its corresponding energy storage battery, then that energy storage inverter can provide surplus power and is marked as an unlocked energy storage inverter. For example, for the energy storage inverter A mentioned above, the initial power allocation for its L1, L2, and L3 phases is 2 kW, 0 kW, and 2 kW, respectively. When the discharge limit of the energy storage battery is 4 kW, energy storage inverter A is marked as a locked energy storage inverter; when the discharge limit of the energy storage battery is 6 kW, energy storage inverter A is marked as a unlocked energy storage inverter. Finally, the system will output which energy storage inverters are marked as locked and which are marked as unlocked based on the above power comparison. These locked energy storage inverters require special handling in subsequent power scheduling, and the load demand needs to be met by borrowing power from unlocked energy storage inverters.

[0054] This embodiment effectively identifies which energy storage inverters still have power surplus and which have exhausted their power by comparing the total three-phase output power of each energy storage inverter with the discharge limit of the corresponding energy storage battery. By clearly marking locked and unlocked energy storage inverters, the system can adjust the power allocation strategy in a timely manner, locking the inverters whose power has been exhausted. This ensures that the total three-phase power output of the energy storage inverters does not exceed the maximum discharge capacity of the corresponding energy storage battery, preventing overload and battery damage. At the same time, it ensures that the entire parallel system can operate smoothly and stably, improving the system's safety and efficiency.

[0055] S104: Determine the missing power of the locked phase of the locked energy storage inverter based on the locked energy storage inverter and the locked phase.

[0056] Based on the locked energy storage inverter and the locked phase, determine the missing power of the locked phase of the locked energy storage inverter, including: obtaining the sum of the initial allocated power of the non-locked energy storage inverters in the locked phase; the difference between the load power corresponding to the locked phase and the sum of the initial allocated power of the non-locked energy storage inverters in the locked phase is the sum of the missing power; based on the sum of the missing power, the number of locked energy storage inverters and the maximum allowable discharge power, determine the missing power of the locked phase of each locked energy storage inverter.

[0057] First, the initial power allocation of the unlocked energy storage inverters in the locked phase is obtained. Understandably, in the locked phase, the system needs to identify which energy storage inverters are marked as unlocked. Then, the initial power allocation of these unlocked energy storage inverters in the locked phase is obtained and summed. For example, if phase L1 is a locked phase, energy storage inverter B is a locked inverter, and energy storage inverter A and C are unlocked energy storage inverters, assuming that in phase L1, the initial power allocation of inverter A is 1 kW and the initial power allocation of inverter C is 2 kW, then the sum of the initial power allocations of the unlocked energy storage inverters in the locked phase is 3 kW.

[0058] Next, calculate the sum of missing power. The sum of missing power refers to the difference between the total power required by the load and the power provided by the unlocked inverter. For example, if the load power of phase L1 is 5 kW and the initial power allocation of the unlocked energy storage inverter is 3 kW, then the sum of missing power is 2 kW.

[0059] Secondly, the missing power is allocated using methods such as sequential allocation, equal distribution, proportional allocation, or variable allocation. It is understandable that, based on the sum of the missing power of the locked phases, the system needs to rationally allocate this power to all locked energy storage inverters. This process can be carried out in the following ways:

[0060] Equal distribution method: The sum of missing power is evenly distributed among all locked-in energy storage inverters. The power allocated to each locked-in energy storage inverter is:

[0061]

[0062] For example, suppose the total missing power is 2 kW, and there are two locked energy storage inverters, the power after being evenly distributed is 1 kW.

[0063] Sequential allocation method: This method distributes the missing power to each locked energy storage inverter according to a specific sequence rule. For example, missing power can be allocated based on factors such as inverter output capacity and load priority. If each locked energy storage inverter has a different maximum allowable discharge power, the inverter with the lower power can be allocated first until its maximum discharge power limit is reached, and then the allocation continues to the next inverter until the missing power is completely distributed.

[0064] Proportional allocation method: Based on the unused margin of each locked energy storage inverter in the locked phase, the missing power is allocated to each locked energy storage inverter in a certain proportion.

[0065] For each energy storage inverter, the maximum allowable discharge power of each phase is generally obtained based on the parameters of the inverter's power devices, representing the maximum power that the inverter can safely and stably output. When the inverter models are the same, the maximum allowable discharge power of each phase of each inverter is generally the same.

[0066] The unused margin of each locked energy storage inverter in the locked phase refers to the difference between the maximum allowable discharge power and the initial allocated power.

[0067] For example, assuming the locked phase is L3, inverter A is a non-locked-out energy storage inverter, and inverters B and C are both locked-out energy storage inverters, the initial power allocation of phase L3 of inverter B is 1 kW, the initial power allocation of phase L3 of inverter C is 0 kW, the sum of the missing power is 4 kW, and the maximum allowable discharge power of each phase of each energy storage inverter is 3 kW; then the unused margin of inverter B is 2 kW, the unused margin of inverter C is 3 kW, the missing power of inverter B is proportionally allocated as 2 / (2+3)*4=1.6 kW, and the missing power of inverter C is proportionally allocated as 3 / (2+3)*4=2.4 kW.

[0068] Variable allocation method: This method allocates power without relying on any fixed standard, but flexibly based on actual conditions and different combinations of factors. Using the example from the proportional allocation method, the power deficit of inverter B can be allocated as 1.8 kW, and the power deficit of inverter C as 2.2 kW.

[0069] Understandably, regardless of whether an equal allocation, sequential allocation, proportional allocation, or variable allocation method is used, it is necessary to ensure that the sum of the missing power and the initial allocated power for each locked energy storage inverter does not exceed its maximum allowable discharge power. This is to prevent overload operation and protect the safety of the energy storage battery and the energy storage inverter. If the calculated missing power exceeds the maximum allowable discharge power of a certain inverter, then that inverter can only be allocated the maximum allowable discharge power. For example, according to the equal allocation method, the actual allocation can be limited using the following formula:

[0070] ;

[0071] in, This is the maximum allowable discharge power of each energy storage inverter; It is the initial power allocation of the locked phase of each energy storage inverter.

[0072] Finally, based on the allocation strategy described above, the missing power of each locked energy storage inverter is output as the basis for subsequent power scheduling. These inverters will output according to the calculated missing power until the load power is satisfied as fully as possible.

[0073] This embodiment ensures that each inverter provides the required power within its maximum allowable discharge power range by rationally allocating the missing power of the locked energy storage inverters. This not only helps balance the power output of each energy storage inverter in the system and avoids inverter overload operation, but also optimizes power dispatch efficiency, ensuring that the entire parallel system can stably and smoothly provide the required power to the load.

[0074] S105: Obtain the charging margin based on the initial power allocation of the unlocked phase of the locked energy storage inverter.

[0075] The charging margin is obtained based on the initial power allocation of the unlocked phases of the locked energy storage inverter, including: determining whether the initial power allocation of the unlocked phases in the locked energy storage inverter is zero; if the initial power allocation of a certain unlocked phase is not zero, it indicates that the unlocked phase is used to supply power to the load, and it is determined that the unlocked phase cannot be charged; if the initial power allocation of a certain unlocked phase is zero, it indicates that the unlocked phase is not used to supply power to the load, and it is determined that the unlocked phase is a rechargeable phase; and obtaining the maximum allowable charging power of the rechargeable phases in the locked energy storage inverter as the charging margin.

[0076] First, the system needs to determine whether the initial power allocation of the unlocked phase in the locked energy storage inverter is zero. Specifically, for each locked energy storage inverter, its initial power allocation in the unlocked phase is checked. If this power value is not zero, it means that the unlocked phase has been used to provide power to the load; if the initial power allocation is zero, it means that the unlocked phase is not supplying power to the load, and therefore it can be used for charging. It can be understood that if the initial power allocation is not zero, it means that the unlocked phase has been used to supply power to the load, so this phase cannot be charged, and the charging margin is zero in this case. If the initial power allocation is zero, it means that the unlocked phase is not used to supply power, so this phase is considered a rechargeable phase. At this point, the system can proceed to the next step and calculate the charging margin.

[0077] Secondly, for each locked energy storage inverter, the maximum allowable charging power of the rechargeable phase is obtained. The maximum allowable charging power is generally obtained based on the parameters of the power devices of the energy storage inverter, and it represents the maximum power that the energy storage inverter can safely and stably input. When the inverter models are the same, the maximum allowable charging power of each phase of each inverter is generally the same.

[0078] Finally, after identifying the rechargeable phase, the system can calculate the charging margin based on the maximum permissible charging power of that phase. The charging margin refers to how much power the unlocked phase can still provide for charging under the current load demand. The calculation formula is: Charging Margin = Maximum Permissible Charging Power - Initial Allocation Power.

[0079] Since the initial power allocation of the rechargeable phase is 0, the charging margin of the rechargeable box is equal to the maximum allowable charging power, that is: charging margin = maximum allowable charging power.

[0080] For example, if the maximum allowable charging power is 2kW, then the charging margin is 2kW.

[0081] Finally, based on the above calculations, the charging margin is output. This information will serve as the basis for subsequent power scheduling, coordinating the operation of other inverters within the system to ensure that the energy storage inverter can charge or discharge as needed.

[0082] This embodiment identifies which inverter's non-locked phases are not used for load power supply, determines their charging capability, and calculates the charging margin. This provides an important basis for system power scheduling, ensuring a balance between load demand and charging demand, thereby efficiently utilizing the working capacity of each inverter. By rationally arranging charging and discharging, the operating efficiency of the energy storage system can be maximized, energy utilization optimized, over-discharging or over-charging prevented, and the system's reliability and endurance enhanced.

[0083] S106: Obtain the discharge margin based on the initial power allocation of the non-locked phase of the non-locked energy storage inverter.

[0084] The discharge margin is obtained based on the initial power allocation of the unlocked phase of the unlocked energy storage inverter, including: obtaining the discharge limit of the energy storage battery corresponding to the unlocked energy storage inverter and the maximum allowable discharge power of the unlocked phase of the unlocked energy storage inverter; and calculating the discharge margin based on the discharge limit of the energy storage battery corresponding to the unlocked energy storage inverter, the maximum allowable discharge power of the unlocked phase of the unlocked energy storage inverter, and the initial power allocation.

[0085] First, it is necessary to obtain the discharge limit of the energy storage battery corresponding to the unlocked energy storage inverter.

[0086] Secondly, obtain the maximum allowable discharge power of the non-locked phase of the non-locked energy storage inverter.

[0087] Next, obtain the initial power allocation of the unlocked phase of the unlocked energy storage inverter.

[0088] Finally, based on the above parameters, the discharge margin is calculated. The formula for calculating the discharge margin is as follows:

[0089]

[0090] in, This represents the maximum permissible discharge power of the non-locked phase. For the initial power allocation of the unlocked phase, This refers to the discharge limit of the energy storage battery corresponding to the inverter. This is the sum of the initial power distribution of each phase.

[0091] Using this formula, the system will comprehensively consider the maximum allowable discharge power of each phase, the initial power allocation, and the discharge limit of the energy storage battery to obtain the available discharge margin of the unlocked inverter.

[0092] For example, taking inverter A as an example, phase L3 is a locked phase, and the initial power allocation of phase L3 is 2kW. Assuming... The maximum allowable discharge power is 3kW (for either phase L1 or L2). The initial power allocation for phase L1 is 2kW, and for phase L2 it is 1kW. The discharge limit of the energy storage battery is 6kW. According to the formula, for phase L1, the discharge margin is min{3-2, 6-(2+1+2)}=1kW. For phase L2, the discharge margin is min{3-1, 6-(2+1+2)}=1kW.

[0093] This embodiment calculates a reasonable discharge margin by comprehensively considering the maximum allowable discharge capacity of each inverter in different phases, the discharge limit of the energy storage battery, and the initial power allocation. This ensures that the unlocked energy storage inverter has sufficient available power to meet system requirements, avoiding power shortages due to the discharge limitations of the energy storage battery, and preventing over-discharge of the system or damage to battery safety. Furthermore, by ensuring reasonable power allocation, the inverter load can be effectively balanced, energy management optimized, and the overall operating efficiency and stability of the system improved.

[0094] S107: Based on the missing power, charging margin, and discharging margin, obtain the target power allocation for each phase of each energy storage inverter.

[0095] Please refer to Figure 3, which is a flowchart of a target power allocation calculation process provided in an embodiment of this application. As shown in Figure 3, the target power allocation for each phase of each energy storage inverter is obtained based on the missing power, charging margin, and discharging margin, including steps S1071-S1073:

[0096] S1071: Based on the discharge margin and missing power, determine the unlocked phase used for power dispatch in the unlocked energy storage inverter, and obtain the first dispatch power of the unlocked phase used for power dispatch in the unlocked energy storage inverter.

[0097] First, the missing power of the locked phase of the energy storage inverter can be obtained from step S104 above, denoted as... Secondly, the discharge margin of the unlocked energy storage inverter can be obtained from step S106, determining which phases can provide power. The phase capable of providing discharge power is selected and denoted as the first dispatch phase, ensuring that the discharge margin of this phase is greater than or equal to the missing power. Finally, the first dispatch power is calculated. It is understood that it is assumed that the discharge margin of the first dispatch phase is... Then the first scheduling power The calculation formula is:

[0098]

[0099] In addition, it is necessary to ensure that, after power dispatch and allocation, the sum of the allocated power of each phase of the energy storage inverter does not exceed the total battery discharge limit of the energy storage inverter (i.e., the discharge limit of the energy storage battery corresponding to the energy storage inverter mentioned above), that is:

[0100]

[0101] For example, taking two energy storage inverters as an example, assuming that phase L3 of locked energy storage inverter B is the locked phase and the missing power is 1kW, and the discharge margins of phases L1 and L2 of unlocked energy storage inverter A are 0kW and 2kW respectively, then phase L2 of unlocked energy storage inverter A is determined to be the phase that can be used for power dispatch. According to the above formula, the first dispatch power is 1kW, meaning that phase L2 of unlocked energy storage inverter A will be allocated 1kW of power for power dispatch. Furthermore, when the discharge margins of phases L1 and L2 of unlocked energy storage inverter A are 1kW and 2kW respectively, combined with the missing power, it can be determined that phase L1 is selected for power dispatch. It is understandable that while ensuring that the discharge margin of the unlocked phase is greater than or equal to the missing power, the unlocked phase with the smallest discharge margin can be selected for power dispatch while still meeting the power dispatch requirements. Finally, after the power is redistributed, the sum of the allocated power of each phase of the energy storage inverter must not exceed the total battery discharge limit of the energy storage inverter. It is understandable that, for example, after the secondary power allocation, the corresponding powers of L1, L2 and L3 of the unlocked inverter A are 2kW, 1kW and 2kW, respectively, and the total battery discharge limit of the unlocked inverter A is 6kW. According to the above formula, the condition of the total battery discharge limit is also met after the secondary power allocation, that is, the first power dispatch is reasonable.

[0102] S1072: Based on the charging margin and missing power, determine the unlocked phase in the energy storage inverter used for power dispatch, and obtain the second dispatch power of the unlocked phase in the energy storage inverter used for power dispatch.

[0103] Based on the charging margin and missing power, determine the unlocked phase in the locked energy storage inverter used for power dispatch, and obtain the second dispatch power of the unlocked phase in the locked energy storage inverter used for power dispatch, including: obtaining the load power corresponding to the unlocked phase in the locked energy storage inverter used for power dispatch and the discharge limit of the energy storage battery corresponding to the unlocked energy storage inverter; and obtaining the second dispatch power based on the first dispatch power, the load power and the discharge limit of the energy storage battery.

[0104] First, the unlocked phase and the first dispatch power used for power dispatch are known from step S1071 above. Based on this, the charging margin of the locked energy storage inverter is obtained from step S105, and it is determined which phases can be used for charging. The rechargeable phase is selected and denoted as the second dispatch phase.

[0105] Secondly, the second scheduling power is calculated. It is understood that the overall power balance of the second scheduling phase must be ensured when calculating the second scheduling power. The formula for calculating the second scheduling power is as follows:

[0106] ;

[0107] In addition, it is necessary to ensure that, after power dispatch and allocation, the sum of the allocated power of each phase of the energy storage inverter does not exceed the total battery discharge limit of the energy storage inverter (the discharge limit of the energy storage battery corresponding to the aforementioned energy storage inverter), that is:

[0108]

[0109] In addition, it is also necessary to ensure that the overall power of the second scheduling phase meets the corresponding load power requirements.

[0110] For example, taking step S1071 as an example, it is known that the corresponding powers of the unlocked inverter A after secondary power allocation are 2kW, 1kW, and 2kW. Assume the load power of phase L2 is 0kW, the total battery discharge limit of the locked inverter B is 2kW, the corresponding powers of the unlocked phases of the locked inverter B after initial power allocation are 2kW and 0kW, the charging margin of the unlocked phase (L2 phase) of the locked inverter B is 2kW, and the load power corresponding to L2 is 0kW. According to the above formula, the second scheduling power of phase L2 of the locked inverter B is -1kW. At this time, it is also necessary to determine whether the sum of the power of each phase of the locked inverter B does not exceed the total battery discharge limit of the energy storage inverter, i.e., (2 + (-1) + 1) = 2. In addition, it is also necessary to calculate whether the overall power of the second scheduling phase meets its corresponding load power requirement, i.e., 1 + (-1) = 0. Based on this, the second power scheduling is reasonable.

[0111] S1073: Based on the missing power, the first dispatch power, and the second dispatch power, obtain the target allocation power of each phase of each energy storage inverter.

[0112] Understandably, after obtaining the missing power, the first dispatch power, and the second dispatch power, the first dispatch phase for power dispatch, the second dispatch phase for power dispatch, and the phase for borrowing power (the locked phase of the inverter) are also determined. Based on this, the target allocated power for each phase of each energy storage inverter can be obtained. This process requires calculating the power allocation of all phases to ensure that the missing power is fully compensated, and also calculating the total power allocation of all energy storage inverters to ensure that the discharge limits and maximum allowable charge and discharge power of the energy storage batteries are met. Understandably, this process verifies whether the power allocation is reasonable, that is, ensures that the total power allocation meets the power dispatch requirements; if the allocation is unreasonable, the dispatch power of the unlocked phases is adjusted to comply with the power limits.

[0113] This embodiment ensures a balance between power supply and demand, avoiding power waste or shortages, by rationally scheduling the power of both latch-up and latch-up energy storage inverters. On one hand, it fully utilizes the discharge margin of the latch-up inverters, enabling the system to utilize stored energy more effectively and improving the overall power distribution efficiency. On the other hand, by balancing the power distribution among inverters through power scheduling, it ensures that system instability is not caused by power overload or insufficient power, improving the reliability of the energy storage system. Furthermore, it ensures that after power scheduling, the discharge and charging power of all energy storage inverters are within reasonable ranges, avoiding damage to the batteries or equipment.

[0114] S108: Power output is performed to match the load according to the target power allocation of each phase of each energy storage inverter.

[0115] After obtaining the target power allocation for each phase of each energy storage inverter according to the above steps, each energy storage inverter needs to perform actual power output according to the target power allocation.

[0116] First, the power output of the unlocked energy storage inverter. Taking energy storage inverter A as an example: the L2 phase of A needs to discharge 1 kW according to the calculation result of S107; ensure that the power output of the L2 phase of A reaches the set value and remains stable; monitor the battery discharge status of A to ensure that it does not exceed its battery discharge limit; if the power output is unstable, make adjustments, for example: if the L2 phase power output fluctuates too much, the PWM (pulse width modulation) control strategy can be adjusted; if the battery voltage drops abnormally, it may be necessary to limit the discharge power.

[0117] Secondly, lock the power regulation of the energy storage inverter. Taking energy storage inverter B as an example: B's L2 phase needs to absorb 1 kW (i.e., charge) to balance the system; monitor B's battery charging status to ensure that it does not exceed its charging power limit; ensure that B's L3 phase receives the required 1 kW to meet the load demand; if B's ​​battery charging is limited, the power distribution of other phases needs to be adjusted to keep the overall system stable.

[0118] Secondly, load power matching. It is understandable that the load needs to receive the power output of the inverter in real time to ensure power balance on the grid side; through the voltage and current sampling feedback system, the power output of each phase is adjusted in real time to prevent insufficient power or overload; if the load demand changes (for example, the power demand of the L3 phase increases), the system should quickly adjust the power output to dynamically adapt to the load.

[0119] Finally, during power output, the system requires continuous monitoring to ensure accurate power matching and make adjustments based on feedback. Specific monitoring includes: Real-time voltage and current monitoring: Real-time acquisition of output power data for each phase of the energy storage inverter using devices such as current sensors and Hall effect sensors; if a power deviation is detected (e.g., a target of 1 kW, but the actual output is only 0.8 kW), the inverter's output power needs to be adjusted. Battery status monitoring: Monitoring the battery's SOC (State of Charge) of the energy storage inverter; preventing overcharging and over-discharging, and adjusting power output limits when necessary. System safety control: Setting up abnormal state detection, such as over-temperature, overload, and short circuit, and taking protective measures when abnormalities occur; optimizing power distribution through intelligent scheduling algorithms to make power output more stable.

[0120] This embodiment ensures the stability, security, and efficiency of power scheduling through intelligent control strategies and real-time monitoring and feedback. Ultimately, it enables the system to achieve precise power allocation, improve energy utilization, and ensure reliable system operation.

[0121] The power scheduling process of the power allocation method for the three-phase parallel system proposed in the above embodiments is explained below with reference to Tables 1 to 10:

[0122] Table 1 - Initial Power Allocation

[0123] Energy storage battery discharge limit / kW L1 target power / kW L2 target power / kW L3 target power / kW Single unit system A6202 Single unit system B2200 Load power 403

[0124] Table 2 - Secondary Power Distribution

[0125] Energy storage battery discharge limit / kW L1 target power / kW L2 target power / kW L3 target power / kW Single unit system A6212 Single unit system B22-11 Load power 403

[0126] For Example 1, please refer to Tables 1 and 2, taking a locked-in energy storage inverter and a locked-in phase as an example. As shown in Table 1, the initial power allocation of each phase of single-unit system A (energy storage inverter) is 2, 0, 2. The initial power allocation of each phase of single-unit system B (energy storage inverter) is 2, 0, 0. The load power of L1, L2, and L3 is 4, 0, 3. The total battery discharge limit of single-unit systems A and B is 6 and 2, respectively. Assume that the maximum allowable charge / discharge power of each phase is 2. It should be noted that the total battery discharge limit here and thereafter refers to the discharge limit of the energy storage battery described above, which will not be repeated here.

[0127] First, by comparing the total output power and load power of each phase, it can be determined that the locked phase is phase L3, and phases L1 and L2 are unlocked phases. Second, by comparing the total three-phase output power of each energy storage inverter with the corresponding discharge limit of the energy storage battery, it can be determined that single-unit system B is a locked energy storage inverter, and single-unit system A is an unlocked energy storage inverter. Then, the difference between the load power corresponding to the locked phase and the sum of the initial allocated power of the unlocked energy storage inverters in the locked phase is calculated as the sum of the missing power. According to Table 1, the sum of missing power is: 3 - 2 = 1, meaning that the missing power required for phase L3 of single-unit system B is 1.

[0128] Secondly, determine whether the initial power distribution of phases L1 and L2 in single-unit system B is zero, thereby determining the rechargeable phase and the charging margin. According to Table 1, phase L2 of single-unit system B is a rechargeable phase with a charging margin of 2.

[0129] Next, based on the initial power distribution of phases L1 and L2 of single-unit system A, the discharge margin is obtained. According to Table 1, the discharge margin of phase L2 of single-unit system A is 2.

[0130] Finally, based on the missing power, charging margin, and discharging margin, the target allocated power for each phase of each energy storage inverter is obtained. Following the power allocation process described in the above embodiments, the data in Table 2 is obtained: the power allocated to L3 of single-unit system B is 1 (missing power), the power allocated to L2 of single-unit system A is 1 (first scheduling power), and the power allocated to L2 of single-unit system B is -1 (second scheduling power). Verification shows that the sum of the secondary allocated power for each phase of single-unit systems A and B does not exceed their respective total battery discharge limits, the secondary allocated power for each phase does not exceed the maximum allowable charging and discharging power of each phase, and the overall power of each phase equals its corresponding load power. That is, after the secondary power allocation, the surplus electricity in the inverter's energy storage battery just fills the power gap, and there is no need to borrow power from the grid.

[0131] Table 3 - Initial Power Allocation

[0132] Energy storage battery discharge limit / kW L1 target power / kW L2 target power / kW L3 target power / kW Single unit system A6212 Single unit system B2200 Load power 413

[0133] Table 4 - Secondary Power Distribution

[0134] Energy storage battery discharge limit / kW L1 target power / kW L2 target power / kW L3 target power / kW Single unit system A6222 Single unit system B22-11 Load power 413

[0135] For Example 2, please refer to Tables 3 and 4, taking a locked-in energy storage inverter and a locked-in phase as an example. As shown in Table 3, the initial power allocation of each phase in single-unit system A is known to be 2, 1, and 2. The initial power allocation of each phase in single-unit system B is 2, 0, and 0. The load power of L1, L2, and L3 is 4, 1, and 3, respectively. The total battery discharge limit for single-unit systems A and B is 6 and 2, respectively. Assume that the maximum allowable charge / discharge power of each phase is 2.

[0136] First, by comparing the total output power and load power of each phase, it can be determined that the locked phase is phase L3, and phases L1 and L2 are unlocked phases. Second, by comparing the total three-phase output power of each energy storage inverter with the corresponding discharge limit of the energy storage battery, it can be determined that single-unit system B is a locked energy storage inverter, and single-unit system A is an unlocked energy storage inverter. Then, the difference between the load power corresponding to the locked phase and the sum of the initial allocated power of the unlocked energy storage inverters in the locked phase is calculated as the sum of the missing power. According to Table 3, the sum of missing power is: 3 - 2 = 1, meaning that the missing power required for phase L3 of single-unit system B is 1.

[0137] Secondly, determine whether the initial power distribution of phases L1 and L2 in single-unit system B is zero, thereby determining the rechargeable phase and the charging margin. According to Table 3, phase L2 of single-unit system B is a rechargeable phase with a charging margin of 2.

[0138] Next, based on the initial power distribution of phases L1 and L2 of single-unit system A, the discharge margin is obtained. According to Table 3, the discharge margin of phase L2 of single-unit system A is 1.

[0139] Finally, based on the missing power, charging margin, and discharging margin, the target allocated power for each phase of each energy storage inverter is obtained. Following the power allocation process described in the above embodiments, the data in Table 4 is obtained: the power allocated to L3 of single-unit system B is 1 (missing power), the power reallocated to L2 of single-unit system A is 1 (first scheduling power), and the power reallocated to L2 of single-unit system B is -1 (second scheduling power). That is, the target power for each phase of single-unit system B is 2, -1, and 1, respectively; the target power for each phase of single-unit system A is 2, 2, and 2. Verification shows that the sum of the secondary allocated power for each phase of single-unit systems A and B does not exceed their respective total battery discharge limits, the secondary allocated power for each phase does not exceed the maximum allowable charging and discharging power of each phase, and the overall power of each phase is equal to its corresponding load power. In other words, after the secondary power allocation, the surplus electricity in the inverter's energy storage battery just fills the power gap, and there is no need to borrow power from the grid.

[0140] Table 5 - Initial Power Allocation

[0141] Energy storage battery discharge limit / kW L1 target power / kW L2 target power / kW L3 target power / kW Single unit system A6212 Single unit system B2200 Load power 414

[0142] Table 6 - Secondary Power Distribution

[0143] Energy storage battery discharge limit / kW L1 target power / kW L2 target power / kW L3 target power / kW Single unit system A6222 Single unit system B22-11 Load power 414

[0144] For Example 3, please refer to Tables 5 and 6, taking a locked-in energy storage inverter and a locked-in phase as an example. As shown in Table 5, the initial power allocation of each phase in single-unit system A is known to be 2, 1, and 2. The initial power allocation of each phase in single-unit system B is 2, 0, and 0. The load power of L1, L2, and L3 is 4, 1, and 4, respectively. The total battery discharge limit for single-unit systems A and B is 6 and 2, respectively. Assume that the maximum allowable charge / discharge power of each phase is 2.

[0145] First, by comparing the total output power and load power of each phase, it can be determined that the locked phase is phase L3, and phases L1 and L2 are unlocked phases. Second, by comparing the total three-phase output power of each energy storage inverter with the corresponding discharge limit of the energy storage battery, it can be determined that single-unit system B is a locked energy storage inverter, and single-unit system A is an unlocked energy storage inverter. Then, the difference between the load power corresponding to the locked phase and the sum of the initial allocated power of the unlocked energy storage inverters in the locked phase is the sum of the missing power. According to Table 5, the sum of missing power is: 4 - 2 = 2, meaning that the missing power required for phase L3 of single-unit system B is 2.

[0146] Secondly, determine whether the initial power distribution of phases L1 and L2 in single-unit system B is zero, thereby determining the rechargeable phase and the charging margin. According to Table 5, phase L2 of single-unit system B is a rechargeable phase with a charging margin of 2.

[0147] Next, based on the initial power distribution of phases L1 and L2 of single-unit system A, the discharge margin is obtained. According to Table 5, the discharge margin of phase L2 of single-unit system A is 1.

[0148] Finally, based on the missing power, charging margin, and discharging margin, the target power allocation for each phase of each energy storage inverter is obtained. Following the power allocation process described in the above embodiments, the data in Table 6 is obtained: the power allocated to L3 of single-unit system B is 1 (missing power), the power reallocated to L2 of single-unit system A is 1 (first scheduling power), and the power reallocated to L2 of single-unit system B is -1 (second scheduling power). That is, the target power for each phase of single-unit system B is 2, -1, and 1, respectively; the target power for each phase of single-unit system A is 2, 2, and 2. Verification shows that the sum of the secondary power allocation for each phase of single-unit systems A and B does not exceed their respective total battery discharge limits, and the secondary power allocation for each phase does not exceed the maximum allowable charging and discharging power of each phase. However, the overall power of phase L3 is not equal to its corresponding load power. That is, after the secondary power allocation, the surplus power in the inverter's energy storage battery is insufficient to fully compensate for the power gap. At this time, phase L3 still needs to be supplied with 1 unit of power from the grid, but this still achieves the effect of reducing grid power supply and saving costs.

[0149] Table 7 - Initial Power Allocation

[0150] Energy storage battery discharge limit / kW L1 target power / kW L2 target power / kW L3 target power / kW Single unit system A6202 Single unit system B2200 Single unit system C6202 Single unit system D2200 Load power 806

[0151] Table 8 - Secondary Power Distribution

[0152] Energy storage battery discharge limit / kW L1 target power / kW L2 target power / kW L3 target power / kW Single unit system A6212 single unit system B22-11 single unit system C6212 single unit system D22-11 load power 806

[0153] For Example 4, please refer to Tables 7 and 8, taking multiple locked-in energy storage inverters and one locked-in phase as an example. As shown in Table 7, the initial power allocation of each phase in single-unit system A is known to be 2, 0, and 2. The initial power allocation of each phase in single-unit system B is 2, 0, and 0. The initial power allocation of each phase in single-unit system C is 2, 0, and 2. The initial power allocation of each phase in single-unit system D is 2, 0, and 0. The load power of L1, L2, and L3 is 8, 0, and 6, respectively. The total battery discharge limit of single-unit systems A, B, C, and D is 6, 2, 6, and 2, respectively. Assume that the maximum allowable charge / discharge power of each phase is 2.

[0154] First, by comparing the total output power and load power of each phase, the locked phase is determined to be phase L3, while phases L1 and L2 are unlocked phases. Second, by comparing the total three-phase output power of each energy storage inverter with the corresponding discharge limit of the energy storage battery, single-unit systems B and D are determined to be locked energy storage inverters, while single-unit systems A and C are unlocked energy storage inverters. Then, the difference between the load power corresponding to the locked phase and the sum of the initial allocated power of the unlocked energy storage inverters in the locked phase is calculated as the sum of the missing power. According to Table 7, the sum of missing power is: 6 - 2 - 2 = 2, meaning the sum of missing power required for phase L3 of single-unit systems B and D is 2. Therefore, the required missing power for phase L3 of single-unit systems B and D can be determined using the equal-division method, each being 1.

[0155] Secondly, determine whether the initial power distribution of phases L1 and L2 in single-unit systems B and D is zero, thereby determining the rechargeable phase and the charging margin. According to Table 7, phase L2 in single-unit systems B and D is a rechargeable phase with a charging margin of 2.

[0156] Next, based on the initial power distribution of phases L1 and L2 in single-unit systems A and C, the discharge margin is obtained. According to Table 7, the discharge margin of phase L2 in single-unit systems A and C is 1.

[0157] Finally, based on the missing power, charging margin, and discharging margin, the target allocated power for each phase of each energy storage inverter is obtained. Following the power allocation process described in the above embodiments, the data in Table 8 is obtained: the power allocated to L3 of single-unit systems B and D is 1 (missing power); the power reallocated to L2 of single-unit systems A and C is 1 (first scheduling power); and the power reallocated to L2 of single-unit systems B and D is -1 (second scheduling power). That is, the target power for each phase of single-unit systems B and D is 2, -1, and 1, respectively; and the target power for each phase of single-unit systems A and C is 2, 1, and 2, respectively. Verification shows that the sum of the secondary allocated power for each phase of single-unit systems A to D does not exceed their respective total battery discharge limits, the secondary allocated power for each phase does not exceed the maximum allowable charging and discharging power of each phase, and the overall power of each phase equals its corresponding load power. In other words, after the secondary power allocation, the surplus electricity in the inverter's energy storage battery not only compensates for the power gap but also has a reserve.

[0158] Table 9 - Initial Power Allocation

[0159] Energy storage battery discharge limit / kW L1 target power / kW L2 target power / kW L3 target power / kW Single unit system A6202 Single unit system B2200 Single unit system C4202 Single unit system D2200 Load power 806

[0160] Table 10 - Secondary Power Distribution

[0161] Energy storage battery discharge limit / kW L1 target power / kW L2 target power / kW L3 target power / kW Single unit system A6222 Single unit system B22-22 Single unit system C4202 Single unit system D2200 Load power 806

[0162] For Example 5, please refer to Tables 9 and 10, taking multiple locked-in energy storage inverters and one locked-in phase as an example. As shown in Table 9, the initial power allocation of each phase in single-unit system A is known to be 2, 0, 2. The initial power allocation of each phase in single-unit system B is 2, 0, 0. The initial power allocation of each phase in single-unit system C is 2, 0, 2. The initial power allocation of each phase in single-unit system D is 2, 0, 0. The load power of L1, L2, and L3 is 8, 0, 6. The total battery discharge limit of single-unit systems A, B, C, and D is 6, 2, 4, 2, respectively. Assume that the maximum allowable charge / discharge power of each phase is 2.

[0163] First, by comparing the total output power and load power of each phase, the locked phase is determined to be phase L3, while phases L1 and L2 are unlocked phases. Second, by comparing the total three-phase output power of each energy storage inverter with the corresponding discharge limit of the energy storage battery, single-unit systems B, C, and D are determined to be locked energy storage inverters, while single-unit system A is an unlocked energy storage inverter. It should be noted that although the total three-phase output power of single-unit system C is equal to the discharge limit of the corresponding energy storage battery, and therefore system C is designated as a locked energy storage inverter, based on the unused margin of each locked energy storage inverter described above, the unused margin of phase L3 in single-unit system C is 0. Therefore, power allocation only needs to be considered for single-unit systems B and D. Then, the difference between the load power corresponding to the locked phase and the sum of the initial allocated power of the unlocked energy storage inverters in the locked phase is the sum of the missing power. According to Table 9, the sum of missing power is: 6-2-2=2, that is, the sum of missing power required by the L3 phase of single-machine system B and D is 2.

[0164] Secondly, determine whether the initial power distribution of phases L1 and L2 in single-unit systems B and D is zero, thereby determining the rechargeable phase and the charging margin. According to Table 9, phase L2 in single-unit systems B and D is a rechargeable phase with a charging margin of 2.

[0165] Next, based on the initial power allocation of phases L1 and L2 of single-unit system A, the discharge margin is obtained. According to Table 9, the discharge margin of phase L2 of single-unit system A is 2. It can be understood that even with a discharge margin of 2 for phase L2 of single-unit system A, an additional output of 2kW will just meet the requirement of not exceeding the total battery discharge limit of single-unit system A.

[0166] Finally, based on the missing power, charging margin, and discharging margin, the target allocated power for each phase of each energy storage inverter is obtained. Following the power allocation process described in the above embodiments, the data in Table 10 is obtained: the power allocated to L3 of single-unit system B is 2 (missing power), the power reallocated to L2 of single-unit system A is 2 (first scheduling power), and the power reallocated to L2 of single-unit system B is -2 (second scheduling power). That is, the target power for each phase of single-unit system B is 2, -2, and 2 respectively; the target power for each phase of single-unit system A is 2, 2, and 2; the target power for each phase of single-unit system C is 2, 0, and 2; and the target power for each phase of single-unit system D is 2, 0, and 0. Verification shows that the sum of the secondary allocated power for each phase of single-unit systems A to D does not exceed their respective total battery discharge limits, the secondary allocated power for each phase does not exceed the maximum allowable charging and discharging power of each phase, and the overall power of each phase is equal to its corresponding load power. In other words, after the secondary power allocation, the surplus electricity in the inverter's energy storage battery just makes up for the power gap.

[0167] This application provides a power allocation method for a three-phase parallel system. By acquiring current power demand information, including the load power, charging / discharging margin, and missing power of each phase, a precise power scheduling basis is established. Subsequently, based on the status of the energy storage inverter, the target power of each phase is intelligently allocated, ensuring that load demand is met while preventing the energy storage device from exceeding its discharge or charging limits. Finally, power output is executed, and combined with real-time monitoring and feedback adjustments, the system can quickly respond to load changes and maintain grid stability. Based on this, the problems of phase-to-phase power rigidity and single-point bottlenecks restricting overall performance in traditional parallel systems are solved, significantly improving the load adaptability and operational reliability of the parallel system. In addition, the safety of the energy storage inverter is ensured, avoiding overload discharge or overcharging and extending equipment lifespan. Finally, through an intelligent power management mechanism, the distributed energy system can participate in grid dispatch more efficiently, possessing good economic efficiency, security, and scalability, and is suitable for various energy storage and load scenarios.

[0168] Based on the power allocation method provided in the above embodiments, this application further provides a power allocation device. Please refer to Figure 4, which is a schematic block diagram of the power allocation device. As shown in Figure 4, the power allocation device 200 includes: an acquisition module 210, a first confirmation module 220, a second confirmation module 230, a missing power calculation module 240, a charging margin calculation module 250, a discharging margin calculation module 260, a power scheduling calculation module 270, and a power allocation module 280. Specifically, the acquisition module 210 is used to acquire the initial power allocation of each phase of each energy storage inverter; the first confirmation module 220 is used to determine the locked phase based on the initial power allocation of each phase of each energy storage inverter; the second confirmation module 230 is used to determine the locked and unlocked energy storage inverters based on the initial power allocation of each phase of each energy storage inverter and the discharge limit of the corresponding energy storage battery; and the missing power calculation module 240 is used to determine the missing locked phase of the locked energy storage inverter based on the locked energy storage inverter and the locked phase. Power; the charging margin calculation module 250 is used to obtain the charging margin based on the initial power allocation of the unlocked phase of the locked energy storage inverter; the discharging margin calculation module 260 is used to obtain the discharging margin based on the initial power allocation of the unlocked phase of the unlocked energy storage inverter; the power scheduling calculation module 270 is used to obtain the target power allocation of each phase of each energy storage inverter based on the missing power, charging margin, and discharging margin; the power allocation module 280 is used to perform power output to match the load based on the target power allocation of each phase of each energy storage inverter.

[0169] It should be noted that the power distribution device described above can execute the power distribution method provided in the embodiments of this application, and has the corresponding functional modules and beneficial effects of the method. Technical details not described in detail in the power distribution device embodiments can be found in the power distribution method provided in the embodiments of this application.

[0170] This application also provides a three-phase parallel system. Referring to Figure 5, it illustrates the hardware structure of a three-phase parallel system capable of executing the methods described in the above embodiments. The three-phase parallel system 300 includes: at least one processor 310; and a memory 320 communicatively connected to the at least one processor 310. Figure 5 shows an example of one processor 310. The memory 320 stores instructions executable by the at least one processor 310, which, when executed, enable the at least one processor 310 to perform the power distribution method described in the above embodiments. The processor 310 and the memory 320 can be connected via a bus or other means; Figure 5 shows an example of a bus connection.

[0171] The memory 320, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules, such as the program instructions / modules corresponding to the power allocation method in the embodiments of this application. The processor 310 executes various functional applications and data processing of the server by running the non-volatile software programs, instructions, and modules stored in the memory 320, thereby implementing the power allocation method described in the above embodiments.

[0172] The memory 320 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the computing device. Furthermore, the memory 320 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 320 may optionally include memory remotely located relative to the processor 310, and these remote memories may be connected to the computing device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0173] The one or more modules are stored in the memory 320, and when executed by the one or more processors 310, the power allocation method described in the above embodiments is executed.

[0174] The above-described product can execute the methods provided in the embodiments of this application, and has the corresponding functional modules and beneficial effects for executing the methods. Technical details not described in detail in this embodiment can be found in the power distribution method described in any embodiment of this application.

[0175] This application provides a non-volatile computer-readable storage medium storing computer-executable instructions that can be executed by one or more processors, such as processor 310 in FIG. 5, enabling the one or more processors to execute the power allocation method in any of the above method embodiments.

[0176] This invention provides a computer program product, which includes a computer program stored on a non-volatile computer-readable storage medium. The computer program includes program instructions that, when executed by a three-phase parallel system, enable the three-phase parallel system to perform the power distribution method in any of the above-described method embodiments.

[0177] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0178] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software and a general-purpose hardware platform, or of course, using hardware. Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0179] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this application as described above. For the sake of brevity, they are not provided in detail; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power distribution method for a three-phase parallel system, wherein the three-phase parallel system includes at least two energy storage inverters, characterized in that, The method includes: Obtain the initial power allocation of each phase of each of the energy storage inverters; Based on the initial power allocation of each phase of each of the energy storage inverters, the locked-in phase and the unlocked phase are determined; Based on the initial power allocation of each phase of each energy storage inverter and the discharge limit of the energy storage battery corresponding to each energy storage inverter, lock-in and unlocked energy storage inverters are determined. Based on the locked energy storage inverter and the locked phase, determine the missing power of the locked phase of the locked energy storage inverter; The charging margin is obtained based on the initial power allocation of the non-locked phase of the locked energy storage inverter; The discharge margin is obtained based on the initial power allocation of the non-locked phase of the non-locked energy storage inverter. Based on the missing power, the charging margin, and the discharging margin, the target power allocation for each phase of each of the energy storage inverters is obtained. Power output is performed to match the load according to the target power allocation of each phase of each of the energy storage inverters.

2. The power distribution method according to claim 1, characterized in that, The step of determining the locked-in phase and the unlocked phase based on the initial power allocation of each phase of each of the energy storage inverters includes: Obtain the corresponding load power; The total output power of each phase is calculated based on the initial power allocation of each phase of each energy storage inverter. The total output power of each phase is compared with the corresponding load power; The phase whose total output power is less than the corresponding load power is defined as the locked phase; otherwise, it is the unlocked phase.

3. The power distribution method according to claim 2, characterized in that, The step of determining the locked-in and unlocked energy storage inverters based on the initial power allocation of each phase of each energy storage inverter and the discharge limit of the corresponding energy storage battery of each energy storage inverter includes: Calculate the total three-phase output power of each energy storage inverter based on the initial power distribution of each phase of each energy storage inverter; An energy storage inverter whose total three-phase output power is equal to the discharge limit of the energy storage battery is defined as a locked energy storage inverter; an energy storage inverter whose total three-phase output power is less than the discharge limit of the energy storage battery is defined as a unlocked energy storage inverter.

4. The power distribution method according to claim 3, characterized in that, The step of determining the missing power of the locked phase of the locked energy storage inverter based on the locked energy storage inverter and the locked phase includes: Obtain the sum of the initial power allocation of the unlocked energy storage inverters in the locked phase; The difference between the load power corresponding to the lock and the sum of the initial allocated power of the unlocked energy storage inverter in the locked phase is the sum of the missing power; The missing power of the locked phase of each locked energy storage inverter is determined based on the sum of the missing power, the number of locked energy storage inverters, and the maximum allowable discharge power.

5. The power distribution method according to claim 1, characterized in that, The step of obtaining the charging margin based on the initial power allocation of the unlocked phase of the locked energy storage inverter includes: Determine whether the initial power allocation of the unlocked phase in the locked energy storage inverter is zero; If the initial power allocation of the unlocked phase is not zero, it indicates that the unlocked phase is used to supply power to the load, and it is determined that the unlocked phase cannot perform charging operation. If the initial power allocation of the unlocked phase is zero, it indicates that the unlocked phase is not used to supply power to the load, and the unlocked phase is determined to be a rechargeable phase. The maximum allowable charging power of the rechargeable phase in the locked energy storage inverter is obtained as the charging margin.

6. The power distribution method according to claim 1, characterized in that, The step of obtaining the discharge margin based on the initial power allocation of the non-locked phase of the non-locked energy storage inverter includes: Obtain the discharge limit of the energy storage battery corresponding to the unlocked energy storage inverter and the maximum allowable discharge power of the unlocked phase of the unlocked energy storage inverter; The discharge margin is calculated based on the discharge limit of the energy storage battery corresponding to the unlocked energy storage inverter, the maximum allowable discharge power of the unlocked phase of the unlocked energy storage inverter, and the initial power allocation.

7. The power distribution method according to claim 1, characterized in that, The step of obtaining the target power allocation for each phase of each of the energy storage inverters based on the missing power, the charging margin, and the discharging margin includes: Based on the discharge margin and the missing power, the unlocked phase used for power dispatch in the unlocked energy storage inverter is determined, and the first dispatch power of the unlocked phase used for power dispatch in the unlocked energy storage inverter is obtained. Based on the charging margin and the missing power, determine the unlocked phase in the locked energy storage inverter used for power scheduling, and obtain the second scheduling power of the unlocked phase in the locked energy storage inverter used for power scheduling; Based on the missing power, the first scheduling power, and the second scheduling power, the target allocated power of each phase of each of the energy storage inverters is obtained.

8. The power distribution method according to claim 7, characterized in that, The step of determining the unlocked phase in the locked energy storage inverter used for power dispatch based on the charging margin and the missing power, and obtaining the second dispatch power of the unlocked phase in the locked energy storage inverter used for power dispatch, includes: Obtain the load power corresponding to the unlocked state used for power scheduling in the locked energy storage inverter and the discharge limit of the energy storage battery corresponding to the unlocked energy storage inverter; The second scheduling power is obtained based on the first scheduling power, the load power, and the discharge limit of the energy storage battery.

9. A power distribution device for a three-phase parallel system, the three-phase parallel system comprising at least two energy storage inverters, characterized in that, The device includes: An acquisition module is used to acquire the initial power allocation of each phase of each of the energy storage inverters; The first confirmation module is used to determine the locked-in phase and the unlocked phase based on the initial power allocation of each phase of each of the energy storage inverters. The second confirmation module is used to determine the locked-in energy storage inverter and the unlocked energy storage inverter based on the initial power allocation of each phase of each energy storage inverter and the discharge limit of the energy storage battery corresponding to each energy storage inverter. A missing power calculation module is used to determine the missing power of the locked phase of the locked energy storage inverter based on the locked energy storage inverter and the locked phase. A charging margin calculation module is used to obtain the charging margin based on the initial power allocation of the non-locked phase of the locked energy storage inverter. The discharge margin calculation module is used to obtain the discharge margin based on the initial power allocation of the non-locked phase of the non-locked energy storage inverter. A power scheduling calculation module is used to obtain the target power allocation for each phase of each of the energy storage inverters based on the missing power, the charging margin, and the discharging margin. A power distribution module is used to output power to match the load according to the target power distribution of each phase of each of the energy storage inverters.

10. A three-phase parallel system, characterized in that, include: At least one processor; as well as, A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enables the at least one processor to perform the method according to any one of claims 1-8.

11. A non-volatile computer-readable storage medium, characterized in that, The non-volatile computer-readable storage medium stores computer-executable instructions that, when executed by the three-phase parallel system, cause the three-phase parallel system to perform the method described in any one of claims 1-8.

12. A computer program product, characterized in that, The computer program product includes a computer program stored on a non-volatile computer-readable storage medium, the computer program including program instructions that, when executed by a three-phase parallel system, cause the three-phase parallel system to perform the method described in any one of claims 1-8.

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