The Constant Voltage Composite Control Method of the SVC with Unbalanced Load Compensation

in practical application of SVC, unbalanced load system exists on many sites, and the voltage at system access point is required to meet the demand of power grid operation. This paper describes a SVC constant voltage control method for an unbalanced load system. the control algorithm controls the voltage at evaluation point to reach the preset range while compensating reactive power of unbalanced load system. the control method could compensate an unbalanced load system into a balanced system, at the same time, the voltage at access point could meet the demand of power grid operation. This control method is particularly applicable to reactive control requirements of steel mills, wind power, solar power grid systems. This algorithm has been applied in Lishizhai 66kV SVC Project in Fushun, inhibits three-phase unbalance of the grid, has achieved good compensation effect.