Insulated-Gate Bipolar Transistor Rectifiers: Why They Are Not Used in Traction Power Substations

Insulated-gate bipolar transistors (IGBTs) are widely used in high-power converters. The definite advantages of IGBT rectifiers [also called pulsewidth modulation (PWM ) rectifiers] are zero reactive power, low harmonics, and inherent power recuperation capability. However, stationary traction rectifiers are built with either thyristors or diodes, not with IGBTs. This article compares IGBT and thyristor rectifiers and analyzes the factors precluding the use of IGBT rectifiers at traction power substations.