Abstract：The all-vanadium redox flow energy storage system can smooth the power fluctuations due to photovoltaic and wind power generation in the DC microgrid. The problem of reasonable power distribution in the system can be solved by an effective control strategy, to improve the operation efficiency of the energy storage system. The total cost of the energy storage battery unit determines the economic applicability of the battery, the loss rate of the energy storage battery can indirectly reflect the working efficiency of the energy storage battery unit, and the SOC consistency can reflect the effectiveness of the power distribution strategy. In this regard, we proposed a power distribution strategy for all vanadium flow battery energy storage system based on the whale optimization algorithm of adaptive weight adjustment and simulated annealing strategy. Firstly, under the constraints of charge state and power balance, the optimization objective function with the total cost of the energy storage system, the lowest average loss rate, and the best charge balance degree is established. Secondly, the adaptive adjustment of the weights-based whale optimization algorithm is used to allocate the optimal power of its energy storage unit. To find a better solution in the global optimization, the simulated annealing algorithm is introduced into the whale optimization algorithm iteration process; Finally, the simulation is run under scenario 1 and scenario 2 as examples. In Scenario 1, a fixed power of 220kW was used as the total power demand, and the priority level of charge and discharge of the energy storage unit was set. The lower the SOC value is, the higher the priority of the VRB energy storage unit is. The energy storage unit allocates power under different distribution strategies according to the priority level; In Scenario 2, the photovoltaic, wind power, total load and total energy storage power demand data of DC microgrid in a certain period were selected as test examples. The parameters of the optimization objective function are the same as in scenario 1. In order to more intuitively reflect the changes of each energy storage unit index in the scheduling cycle, the power distribution curves of VRB energy storage units under different distribution strategies, the total battery cost comparison diagram, the loss rate comparison diagram and the optimal combination Gantt chart were respectively drawn. The economic cost of VRB energy storage unit was measured by taking kilowatt hour cost as the target value,the loss rate was calculated by the equivalent circuit model, the charge-discharge balance was defined by the battery SOC value, and the number of battery charge-discharge times under each scheduling period was calculated by the optimal Gantt chart. Based on the analysis of the operating indexes of the electrochemical energy storage battery, the power distribution effect strategy of VRB energy storage system under the condition of meeting the total objective function was proposed. Compared with the traditional strategy, the results showed that the optimal allocation strategy effectively reduces the operation cost and loss rate of energy storage battery cells, the battery charge and discharge times are significantly reduced, and the state of charge consistency is good. Importantly, the allocation strategy converges faster than the target value under the traditional strategy, which verified the accuracy of the proposed optimization method and the applicability of the model.
付华, 陆鹏, 张俊男. 基于A-SA-WOA算法的直流微电网全钒液流电池储能系统功率分配策略[J]. 电工技术学报, 2023, 38(7): 1826-1837.
Fu Hua, Lu Peng, Zhang Junnan. Power Allocation Strategy of DC Microgrid All Vanadium Redox Flow Battery Energy Storage System Based on A-SA-WOA Algorithm. Transactions of China Electrotechnical Society, 2023, 38(7): 1826-1837.
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