Evaluation of MV power stack topologies

All major variable speed drive equipment manufacturers have recently launched one or more MV, PWM, voltage source inverter (VSI) drives to the market. These inverter drives are based on different power stack topologies and HV power devices (namely the insulated gate bipolar transistor and the integrated gate commutated thyristor). This paper reviews various MV PWM VSI power stack topologies in the power range 2-7 MW. It also examines and compares practical inverter stack topologies used by drive manufacturers to achieve a high power IGBT-based converter design with 4.16 kV AC RMS output voltage