Flying Capacitor Voltage Balancing Control Strategy Based on Logic-equations in Five Level ANPC Inverter

Abstract

This paper proposes a novel voltage balancing control approach for the flying capacitors in a five-level Active-Neutral-Point-Clamped inverter (ANPC). The projected method is based on the control signal of the flying capacitor (FC) voltage. A Staircase reference voltage-based Phase-Shifted PWM (PS-PWM) technique is used to generate the different levels and simple logic-equations. The proposed control can regulate the voltage of the FC at the requested reference value and generate the required five-level output voltage with fast dynamics. It requires fewer and simpler calculations and it has a fast execution time. The Simulations are performed using MATLAB and Simulink. The obtained results demonstrate the good performance of the FC voltage control and the high quality of the output voltages and current spectrum.