Single phase five-level quasi-switch boost inverter with high voltage gain

Abstract

In this paper, a new topology incorporating between the quasi-switch boost network and the five-level cascade H-bridge inverter has been presented. By using one more inductor and one more capacitor compared to conventional quasi-switch boost network, the voltage gain, as well as the voltage stress on power devices of an intermediate network, is significantly improved. In addition, the quality of the output voltage waveform is also improved by using a five-level cascade H bridge topology. The PWM control strategy for this topology is based on the carrier phase shift technique which ensures that each module of cascade form behaves as a three-level quasi-switch boost inverter. As a result, the output voltage of the converter has five-level. The shoot-through signal is inserted in the time interval, in which the output voltage of the inverter is zero value to not affect the output voltage waveform. The simulation and experiment results are constructed to verify the accuracy of the introduced topology.