Research on Optimal Chimeric Morphology of Flexible DC Interconnect Topology Considering Node Inertia Constraints

In order to solve the security risks between different power grids, it is necessary to use flexible interconnection devices to interconnect with each other to improve the security and reliability. With the development of dual-high power grids, the optimization of flexible DC interconnection topology should not only consider the location and capacity of traditional zonal interconnection devices, but also take into account the influence of node distributed inertia. In this paper, the first selection is carried out through the node-distributed inertia. Secondly, the active demand of the receiving grid is determined based on the change of the total supply capacity after the N-1 fault and the reactive demand is obtained through the sensitivity method, so as to put forward the scope of determining the capacity and obtain the optimal results of the site. Finally, the methodology is verified by the example, and the safety calibration is carried out for the obtained results. After the input of the flexible DC interconnection device, the power supply pressure of heavy partition can be alleviated, the power support can be carried out when the fault occurs, and the voltage of the partition grid can be stabilized.