柔性直流互联孤岛微网群的分布式频率协同控制

Flexible DC transmission is one of the best choices for solving the integration and aggregation problem of multiple microgrids. However, under the traditional control, DC transmission will cause frequency decoupling among microgrids, which makes them unable to form frequency support with each other. To solve this issue, based on the consistency theory, a new distributed frequency control structure is proposed. Then, a coordinated control strategy matching with the structure is designed. In this strategy, through the cooperation of interface converter stations, the objectives of frequency regulation among microgrids can be achieved. Meanwhile, with the cooperation between distributed generators in microgrids, the issues such as frequency restoration and accurate allocation of reserve capacity are effectively solved. The stability of the proposed control strategy in the system is demonstrated by the Lyapunov direct method. Finally, the simulation verifies the effectiveness and "plug and play" performance of the proposed strategy.