Matrix converter sliding mode based control for induction motor drive

The matrix converter is a very popular topic because of its advantages in comparison with the indirect frequency converter. Output voltage is produced by the direct switching of output phases to input phases. The modulation strategy and control algorithm used are very important parts of the converter´s controller. Common modulation strategies from the field of indirect frequency converters cannot be used in a general case because of the absence of a DC-link. Therefore, modulation strategies based on a virtual DC-link space vector modulation were developed, which works as a dependency injection. That is why different approaches can be used to control both the output voltage and the input current at the same time. In this paper phase control of the input current in combination with a sliding mode control of the output voltage is presented. This enables us to overcome the traditional limitations of the output voltage without resigning from the input current control. Since the induction machine is a system of a higher order than the action vector, an emphasis was also put on stability analysis.