Optimal synchronous pulsewidth modulation with a trajectory tracking scheme for high dynamic performance [invertor control]

It is noted that synchronous pulsewidth modulation based on precalculated and stored optimal pulse patterns could be a superior method for the control of high-power inverters operated at low switching frequency. The technique has rarely been applied in practice owing to its poor dynamic performance. A feedforward control technique eliminates this drawback: the space vector of the machine currents is forced to track a precalculated optimal trajectory in the steady state and under the transient operating conditions commanded by the drive control system. Undesired transients caused by the pulsewidth modulator are avoided. Experimental results obtained from a 30 kW AC drive are presented