Harmonic Injection PWM of Multiple Inverter for Ripple Torque Reduction

概要

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In this paper, a novel harmonic injection PWM method is proposed for harmonic reduction. The third harmonic is injected to the reference voltage, of which amplitude and phase angle are regulated so that the dominant ripple torque components are reduced.In a large capacity power converter, GTOs are commonly used as the switching devices and a multiple configuration of unit power converters has been applied. The use of GTOs allows higher voltage and larger current to be handled. However, it results in increased harmonics, because of their relatively low switching frequency of about 500Hz. Therefore, harmonic reduction method for large capacity applications is of great interest, which is suitable for a multiple power converter without increasing the cost. The harmonic injection PWM fulfills the requirement.The harmonic components of output voltage, output current and torque when a harmonic component is injected are analyzed in detail. The most suitable amplitude and phase angle are derived from theoretical analysis. Simulation results show the effectiveness of the method.
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