Abstract
This chapter focuses on the development of medium‐voltage (MV) drives without the need of isolation or phase‐shifting transformers. It analyses the common‐mode (CM) voltage issue in the MV drive, and discusses mitigation methods for the reduction or elimination of CM voltages. The chapter presents principle and realization of transformerless voltage source converter (VSC) and current source converter (CSC) fed MV drives. To develop a multilevel VSC fed MV drive without requiring isolation transformers, three methods can be generally employed: elimination of the CM voltages with the reduction of CM voltage scheme 2 (RCM2), suppression of CM voltage by CM filters, and combined method of the CM filters and reduction of CM voltage scheme 1 (RCM1)/RCM2 schemes. With the neutral point of the stator winding grounded, the CM voltage produced by the rectifier and inverter is applied to the neutral of the transformer winding.
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