An Active Interphase Transformer for 12-Pulse Rectifier System to Get the Performance Like 24-Pulse Rectifier System

Abstract

In this paper, an active interphase transformer is implemented in 12-pulse diode bridge rectifier system. This system draws near sinusoidal supply from the utility. In this paper, simulation results are provided for two schemes. Scheme I consists of an autotransformer (0.2 P0 (PU)), two active interphase transformer, two diode bridge rectifiers & PWM VSI. A PWM VSI injects triangular shaped current into the auxiliary winding of active interphase transformer connected between two diode bridge rectifiers. This modification result in reduction of harmonics in utility line current. In scheme II boost converter is incorporated across the auxiliary winding of active interphase transformer. Both schemes draws clean power from the utility & is suitable for powering high power ac motor drive system, power supplies, UPS system to meet IEEE-519 harmonic current limit. A PWM VSI & boost converter connected across auxiliary winding of active IPT is of low kVA & it is not directly exposed to line transients. Simulation results are provided for 415 V, 50 kVA 12-pulse rectifier system for both schemes.