连续换相失败对大电网功角稳定影响分析OA

Successive commutation failure is a serious threat to the safe operation of large AC/DC power grid,which may lead to cascading failures across regional power grids.The influence of successive commutation failures on the power angle stability of AC systems was studied by combining theoretical analysis and actual power grid simulation.Firstly,from the perspective of reactive power exchange in AC/DC systems,the cause of successive commutation failure was analyzed.Then,taking a simplified three zone AC/DC interconnected system as an example,the variation of the relative power angle of the synchronous generator in the AC system during the successive commutation failure process was analyzed based on the equal-area criterion.Finally,simulation analysis was conducted on the power angle changes of the sending-side power grid and the receiving-side power grid when the successive commutation failure occurs at the Shaoxing converter station.Simulation results show that successive commutation failure can cause multiple energy shocks on the AC system in a short period of time.Long-term successive commutation failure is able to result in power angle instability of the AC system.