Space Vector Modulation for High Power Five Level Current Source Inverters

A 5-level current source inverter (CSI) is proposed in this paper for high-power applications. The converter topology consists of two full-bridge current source inverters whose outputs are connected in parallel for a large induction motor. The two inverters are fed by two isolation transformers to the elimination of possible circulating currents. A space vector modulation scheme is developed for the inverters to generate the desirable output current. The inverter current harmonics are investigated at different amplitude modulation index and fundamental frequencies. The developed scheme for multilevel CSI can produce adjustable output current with limited switching frequencies, which are very desirable features for high dynamic performance large motor drives.