전력전자 변환장치를 위한 고정 스위칭 주파수로 동작하는 3상 및 2상 변조 SRP-PWM기법

3-Phase and 2-Phase Modulated SRP-PWM Technique with a Fixed Frequency for Power Electronics Converters

In this paper, Inverter drives adopting 3-phase and 2-phase SRP-PWM (Separately Randomized Pulse Position PWM) with fixed switching frequency is proposed. In the proposed SRP-PWM scheme, each of 3 or 2 phase pulses Is located randomly in each switching interval. The experimental results show that the voltage / current harmonics and the switching noise harmonics are spread to a wide band area. Also, the performance of the 3-phase SRP-PWM and the 2-phase SRP-PWM are compared to each other. In result, the speed response is nearly similar to each other from the viewpoint of the v/f constant control.