Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title A Study on Parallel Operation of PWM Inverters for High Speed and High Power Motor Drive System
Authors Un-Kwan Cho ; Jung-Sik Yim ; Seung-Ki Sul
DOI 10.6113/TKPE/2010.15.3.244
Page pp.244-251
ISSN 1229-2214
Keywords Coupled inductor; PWM inverter; Parallel operation
Abstract High speed motors have been widely used in industries to reduce system size and improve power conversion efficiency. However, the high speed motors sometimes suffer from core losses caused by PWM current ripple; noting that the phase inductance, Ls, of high speed motor is smaller than that of ordinary motors. In the proposed topology, three PWM inverters are connected in parallel through nine coupled inductors. Compared to the PWM current ripple of the conventional single inverter system, that of the proposed scheme can be conspicuously reduced without the voltage drop at the inductors. In this paper a theoretical analysis of the output voltage of the proposed topology is presented, and then the validity of the proposed method is verified by experimental results.