Study on LVRT of DFIG under the Asymmetric Grid Voltage based on Fuzzy PID D-STATCOM

This paper aims at the failure of wind power generation during the transmission process. The traditional rotor of the Crowbar device requires a large reactive support, which causes large fluctuations to the reactive power of the output grid while inputting and casting in the guard period. This case would influence the entire power system of power transmission. However, D-STATCOM can regulate and transmit the power. So, this paper mainly analyzes the influence of static Var compensator on the entire wind system and presents the fuzzy PID D-STATCOM, applying fuzzy adaptive PID controller to the static Var compensator so as to raise the control accuracy of the whole system and improving the dynamic performance as well as the steady-state performance. In the end, the fuzzy PID D-STATCOM with the Crowbar device is designed. The results show that the whole reactive power and dynamic characteristic are more stable than traditional D-STATCOM.