Optimization Scheme of STATCOM Parameters for Temporary Overvoltage Suppression

The temporary overvoltage (TOV) issue arises more frequently in modern power system as the access of electronic power equipment nowadays. One main reason is the reactive power surplus generated by reactive power compensators such as STATCOM. Due to the inherent delay of control and measurement in STATCOM, its reactive current output during the low-voltage ride through (LVRT) period cannot be withdrawn in time after fault clearance, resulting in surplus reactive power that raises the terminal voltage. To improve the voltage support capability of STATCOM, this paper first established the equivalent impedance model of STATCOM, then analyzed the influence of control parameters on TOV based on the dynamics of the current controller and filter. On this basis, the parameter range is determined according to the TOV and stability constraint, so as to form a parameter optimization scheme. The simulation results show that the proposed scheme can effectively suppress TOV.