A variety of different optimal pulsewidth modulation techniques have emerged from recent research. Among these are the real-time optimization techniques, the synchronous off-line optimized modulation, and the trajectory tracking method. The paper evaluates their respective performance under comparable operating conditions. It is concluded that considerable reduction of harmonic distortion can be achieved in the modulation range above m = 0.6 at switching frequencies below 500 Hz. The benefit reduces with reducing modulation index. Below m = 0.2, optimal and non-optimal methods show little differences.
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