Optimized Pulse Patterns for Salient Synchronous Machines

Abstract

Synchronous optimal pulse width modulation is commonly applied when the ratio between the fundamental frequency and the switching frequency is low. Offline computed pulse patterns are optimized in terms of the harmonic distortion in phase currents. Typically, the underlying optimization problem is based on a simple inductor model representing the harmonic behavior of one phase of a nonsalient machine. This paper proposes an alternative formulation of the optimization problem, which generalizes it for salient machine types. An investigation of the optimization results' sensitivity to operating point-dependent parameters is presented.