Transient simulation of minimum current ripple - hybrid multi-level current source inverter (CSI)

Multi level inverters have the capability to deliver higher output power with lower dv/dt or lower di/dt and with less distorted output waveform. This paper presents a new topology for single phase multi level current source inverter. Here H-bridge coordination with inductor cell provides the multilevel waveform generation. The inductor cell is a combination of four unidirectional power electronic switches with an inductor connected across cell circuit. Inductor cell operation causes the intermediate levels of current waveform without any additional dc power sources by using charging and discharging modes. A chopper circuit is used to provide the continuous smoothing current to the input side inductor. To control the intermediate level operation PI controller is used. In this paper MATLAB simulation of 5 level, 9 level and 17 levels are implemented. The results show that the circuit configuration woks properly to give low output harmonics with small size of inductors which proves the feasibility of the proposed strategy.