Power Coordinated Control Strategy for AC/DC Hybrid Microgrid Considering Combined Energy Storage of Electric Vehicles and Batteries
Wang Hao1,2, Wu Zhe1, Kang Boyang1, Li Bin1,2, Li Shaoling1,2
1. School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454003 China; 2. Henan Key Laboratory of Intelligent Detection and Control of Coal Mine Equipment Jiaozuo 454003 China
Abstract：In an islanded AC/DC hybrid microgrid, after electric vehicle (EV) are connected to the microgrid as flexible energy storage in a decentralized manner, insufficient consideration is given to the transmission capacity and power transfer pressure for the bidirectional interconnection interface converter (BILC) connecting the DC and AC subgrid, when the conventional energy storage state of charge (SOC) is equalized between the AC and DC subgrid. Geographically proximate energy storage units can be interconnected to form an energy storage subgrid, which is connected to a hybrid AC and DC microgrid. Sharing energy storage between AC and DC subgrid can alleviate BILC transmission pressure and provide research ideas for SOC equalization among energy storage. However, only relying on BILC to coordinate the inter-network power flow cannot satisfy the flexible operation of all working conditions. Therefore, in this paper, a power coordinated control strategy for AC/DC hybrid microgrid considering combined energy storage of electric vehicles and batteries is proposed, under a new AC/DC hybrid microgrid ring topology. First, this paper introduces the hierarchical control structure of AC/DC hybrid microgrid containing combined energy storage, where the AC and DC buses are connected to the energy storage bus through bidirectional AC-DC converter and bidirectional DC-DC converter, respectively. Secondly, the paper delves into the coordination control layer within this hierarchical structure, and the hybrid microgrid is divided into four operation states by considering the net power of the AC and DC subgrid, also adding the maximum transmission power of the power interconnection level as a constraint. And further analyze the power transmission direction of the power mutual class and the state of the energy storage SOC, classify the specific operating conditions corresponding to different modes of the microgrid in detail. Thirdly, the combined energy storage action rules are designed by dividing the action response priorities of EV and battery storage units, and the power interactions among the AC subgrid, DC subgrid, and combined energy storage system are studied in detail, formulate the AC/DC hybrid microgrid power coordination control strategy and the switching method for different modes of operating conditions. Finally, an AC/DC hybrid microgrid simulation model is constructed based on the Matlab/Simulink simulation platform to verify the control strategy proposed in this paper. Through simulation experiment analysis, the following conclusions can be drawn: (1) Under the ring topology of the new AC/DC hybrid microgrid, equalize the energy storage SOC by designing the combined energy storage response priority and power coordination control strategy, avoiding the interaction loss between the battery energy storage and sharing the power transmission pressure of the BILC between the AC and DC subgrid. (2) On the basis of hierarchical control, the microgrid central controller (MGCC) is used to carry out the power coordination control, coordinating the relationship between the various layers of the hybrid microgrid to ensure stable operation of the inter-grid power coordination under different modal operating conditions of the system. (3) The EV is connected to the combined energy storage as flexible energy storage, and the EV charging-discharging response priority is set for delaying-stopping the battery energy storage overcharging and overdischarging trend. Through the power coordinated control, the combined energy storage is flexibly controlled to participate in the action to maintain the AC/DC hybrid microgrid power balance.
王浩, 仵哲, 康博阳, 李斌, 李绍令. 考虑电动汽车和蓄电池联合储能的交直流混合微电网功率协调控制策略[J]. 电工技术学报, 2024, 39(19): 6085-6103.
Wang Hao, Wu Zhe, Kang Boyang, Li Bin, Li Shaoling. Power Coordinated Control Strategy for AC/DC Hybrid Microgrid Considering Combined Energy Storage of Electric Vehicles and Batteries. Transactions of China Electrotechnical Society, 2024, 39(19): 6085-6103.
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2024, Vol. 39 
