基于集成三端口的混合微网场景自适应功率协同控制策略

Adaptive Power Cooperative Control Strategy of Hybrid Microgrid Scenarios Based on Integrated Three-Port

混合微网由交流子网、直流子网和储能子网组成,集成三端口拓扑结构应用到混合微网中作为连接交直流子网和储能子网的桥梁。提出了一种基于集成三端口的混合微网功率协同控制策略。针对混合微网存在的功率耦合导致运行控制复杂问题,结合该微网结构设计了一种功率协同控制策略以确保微网的可靠运行,该策略包含子网内源荷平衡控制、网间功率互济控制及考虑储能荷电状态的储能单元功率分担控制3种底层控制策略。此外设计了基于归一化交流频率与直流电压的分段控制策略,实现上述3种策略间的组合与切换,以适应不同微网运行场景的变换。该功率协同控制策略无需通信链路,提高了混合微网整体运行可靠性。最后通过MATLAB/Simulink对所提出的控制策略进行了仿真验证,证明了该场景自适应功率协同控制策略的有效性。

The hybrid microgrid is composed of AC subgrid,DC subgrid and energy storage subgrid.The integrated three-port topol⁃ogy structure is applied to the hybrid microgrid as a bridge connecting the AC/DC subgrid and energy storage subgrid.A hybrid microgrid power cooperative control strategy based on integrated three-port is proposed in this paper.In view of the complicated operation control problem caused by the power coupling of the hybrid microgrid,a power cooperative control strategy is designed in combination with the microgrid structure to ensure the reliable operation of the microgrid.The strategy includes three underlying control strategies:source and load balance control within the subgrids,power mutual aid control between grids,and power sharing control of energy storage units considering the state of charge of the energy storage.In addition,a segmented control strategy based on normalized AC frequency and DC voltage is designed to realize the combination and switching of the above three strategies to adapt to the change of different microgrid operation scenarios.The power cooperative control strategy does not require a communica⁃tion link and improves the overall operation reliability of the hybrid microgrid.Finally,the proposed control strategy is simulated and verified by MATLAB/Simulink,which proves the effectiveness of the scenario adaptive power cooperative control strategy.