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In Synchronous motors, in the range of several mega watts, operated at low switching frequencies, it is advantageous to use off-line optimal PWM, to reduce the switching losses and undesired frequency
harmonic components. But its low
transient performance may restrict the use of such commands. Considering the feed forward structure of PWM modulator, it is tried in this paper to compensate the undesired modulation error transients that may cause high over currents. An 80-KW setup is used to simulate the experiments in laboratory sizes. IGBT based, two-point voltage source inverter is used, and operated at low switching frequencies to simulate GTO-based inverters that are commonly used to feed motors in this power range.