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A Simple Inverter Nonlinearity Compensation Method Using On-Line Voltage Error Observer

Nonlinearity characteristics of the inverter will cause the output voltage and current waveform distortion, directly affecting the torque output stability and speed control performance of the AC motor drive system. For this reason, a new inverter nonlinearity compensation method for permanent magnet synchronous motor (PMSM) is proposed in the paper. A simple voltage error observer based on current deviation of the reference model and the actual system is used in d-q synchronous coordinate system. The method is simple to implement and does not require the precise polarity of current and additional design of testing circuit. The proposed scheme is applied to the discretized Simulink model for PMSM and the simulation results demonstrate the effectiveness of the method.