Research on Coordinated Control Strategy Considering stability risk of DC Sending and Receiving End Power Grids

The application of large-capacity ultra-high voltage direct current (UHVDC) transmission greatly improves the large-scale resource allocation capability, while also increases the complexity of security and stability control of the power grid. With the wide application of cross-region DC control strategies such as DC frequency control and power emergency support, the determination of DC control strategies must consider the influence of DC power changes on the stability of the sending and receiving end power grids. After analyzing the defects of existing control strategies for high power loss accidents, a coordinated control strategy is proposed that utilizes a variety of control resources in the entire power grid after the DC blocking happened, as well as considering the dynamic coupling characteristics of the DC sending and receiving end power grids. The actual power grid simulation results show the effectiveness of the proposed control strategy.