Self-commissioning algorithm for matrix converter, nonlinearity compensation

Matrix converter nonlinear errors due to voltage drop and commutation delay introduce a distortion between voltage reference signals and output phase voltages. In current controlled applications, the current regulators are capable of compensating for such voltage command error. However, where output voltage estimation is required such as in state observers used for sensorless control of ac drives, the converter error reduces the accuracy of the voltage estimate, especially at low speeds. This work proposes a simple and accurate technique for the identification of converter parameters before the drive startup. Based on the identified parameters, the nonlinearities are compensated. The feasibility and effectiveness of the presented method is shown in simulation. Experimental results are also reported.