FAST CURRENT TRAJECTORY TRACKING CONTROL-BASED ON SYNCHRONOUS OPTIMAL PULSEWIDTH MODULATION

State-of-the-art pulsewidth modulation techniques fail to give satisfactory results when high-bandwidth torque control is required at the low switching frequency of modern high-power ac machine drives, A novel current control method refers to precalculated optimal synchronous pulse patterns, These are used to generate specific current reference trajectories to be adapted on-line to the actual dynamic torque command. A. fast tracking controller, operated in parallel to a conventional PI controller, minimizes the trajectory tracking error, The optimized current trajectories ensure maximum response and mimimum harmonic distortion.