Simulation Analysis and Research on DC Modulation Measures of Sichuan Power Grid

This paper focuses on the study of the operation of the Sichuan power grid in Sichuan Province during the high water season.After the power line fails, the DC power boost/reduction is used to reduce the power imbalance of the system. It also introduces the step strategies regarding to DC power boost/reduction and select the fault of the DC section line from Jinping to Sunan, Yazhong to Jiangxi for simulation analysis. When selecting the section line fault from Jinping to southern Jiangsu, Yazhong to Jiangxi, Kangding to Shuzhou, the double side frequency modulation mode was adopted to adjust the DC line transmission power of simulation and the influencing factors of DC modulation were obtained. At the same time, the chosen different parameter values was simulated and analyzed, and the relevant measures to improve the system stability had been obtained.