Voltage control strategy with stepped controllable shunt reactor in large-scale wind power system

Due to the randomness and uncertainty of wind power, voltage fluctuation in large-scale wind power system should not be ignored. The stepped controllable shunt reactor (SCSR) is an effective method to regulate voltage within its limits in this paper. The physical structure and working principle of SCSR are analyzed in detail. Voltage control method of SCSR is proposed, which is based on the bus voltage fluctuation of high voltage side in transformer substation. Calculating method for each required capacity is given. Combined with actual engineering project, the stepped controllable shunt reactor (SCSR) is demonstrated to be applicative and effective. Its capacity can adjust automatically according to operating characteristics of wind power. It can maintain voltage of the controlled bus in modest bounds. It has effect on the safe and good quality operation in large-scale wind power system.