PWM Switched Voltage Source Inverter with Zero Neutral Point Potential

A three phase three-level pulse width modulation (PWM) switched voltage source inverter with zero neutral point potential is designed. It consists of three single-phase inverter modules and each module is composed of a switched voltage source and inverter switches. The major advantage is that the peak value of the phase output voltage is twice as high as that of the conventional neutral-pointclamped PWM inverter. Thus, the proposed inverter is suitable for applications with low voltage sources such as batteries, fuel cells, or solar cells. Furthermore, three-level output waveforms of the inverter can be achieved without the switch voltage unbalance problem. Since the average neutral point potential of the inverter is zero, a common ground between the input stage and the output stage is possible. Therefore, it can be applied to a transformer-less power conditioning system. The SVS inverter is tested by a PSIM simulation and hardware is implemented and verified.