Multi Band Hysteresis Current Controlled Flying Capacitor Multi Level Inverter Based Shunt Active Power Filter for Distribution Systems

Lecturer, Department Of Electrical Engineering, L. E. College Morbi-363642, India, ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract -This paper presents application of flying capacitor multi level inverter in high voltage shunt active power filter. The proposed strategy uses three independent multi band hysteresis current regulators to generate gating signal for multi level inverter. Flying capacitor multi level inverter is used for high voltage and high power application with low distortion of source current waveforms at low switching frequency. A new flying capacitor voltage balancing technique is proposed which maintain constant capacitor voltage with desired current wave shape. Five level flying capacitor multi level inverter topology has been considered for active filtering of 11 kV distribution systems. The fast dynamic response of active power filter with low total harmonic distortion of source current has been achieved with the proposed strategy.