New method for resonance elimination in capacitor banks

In this paper a new control algorithm to remove parallel resonance in the power factor correction capacitor banks is presented. The proposed system is based on series inverter with capacitor banks in each phase. The main advantage of this method is fast response to eliminate resonance. Another advantage is the use of a low gain proportional controller, rather than a PI controller, to control the dc link voltage. It is shown that P controller improves the transient response of the system to the load changes. Also, THD of voltage at the point of common coupling and the capacitor bank current is significantly reduced.