A Novel Measurement and Compensation Method of Inverter Nonlinearity for Linear Induction Motor

This paper proposes a novel measurement and compensation method of the inverter nonlinearity for linear induction motor (LIM). The voltage source inverter is configured to operate as a single-phase full-bridge inverter, and the equivalent circuit is extracted. The stator resistance of LIM is obtained by least square (LS) method to reduce the calculation error. The inverter nonlinearity voltage error is analyzed and a model adapted to the DC bus voltage is extracted. By using voltage regulator, the nonlinear coefficients are solved under two different DC bus voltages and stored in the table. The nonlinear voltage error is calculated by the model using the look-up table (LUT) method. Experimental results demonstrate the accuracy of the nonlinear voltage error model and the feasibility of the nonlinear voltage error compensation.