FAST CURRENT TRAJECTORY TRACKING CONTROL-BASED ON SYNCHRONOUS OPTIMALPULSEWIDTH MODULATION

State-of-the-art pulsewidth modulation techniques fail to give satisfa ctory results when high-bandwidth torque control is required at the lo w switching frequency of modern high-power ac machine drives, A novel current control method refers to precalculated optimal synchronous pul se patterns, These are used to generate specific current reference tra jectories 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 cu rrent trajectories ensure maximum response and mimimum harmonic distor tion.