デッドタイムの影響を考慮した高圧電動機直接駆動用多重PWM制御法

概要

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Recently, high-voltage motor direct drive systems have been put to practical use, and various multilevel PWM strategies have also been proposed. This paper describes a multilevel PWM strategy (our group calls “Carrier Phase Selection Method (CPS)") that has the lowest line voltage harmonic distortion in order to prevent the degradation of high-voltage motor winding insulations. This method takes the adverse effect of a deadtime into consideration, and it controls the shift direction of a carrier phase. Therefore, a favorable output waveform without instantaneous voltage serge is achieved even if the line voltage level changes. Moreover, the switching transitions across all switching devices are well-balanced, so the utilization of inverter unit cells is equalized. It is important factor when designing the entire system.From simulation and experimental results, it is shown that this CPS method is particularly effective to high-voltage motor direct drive systems.
社団法人電気学会の論文
2006-01-01