Critical Section Channel Maintenance Evaluation Method For Double Hvdc Feed-In Grid

In order to ensure stable operation of DC, the dual DC feed grid structure needs to ensure a certain grid strength, but it is necessary to study how to evaluate the impact of critical section maintenance on the AC system. Firstly, the strength evaluation index of the receiving power grid is analyzed. Secondly, an index that characterizes the effects of two DC couplings is proposed. Finally, a critical section channel maintenance evaluation method for double ultrahigh voltage DC feed grid is proposed. The effectiveness of the proposed method is verified by the HN Power Grid simulation.