This paper gives an overview to voltage-controlled matrix converter commutation. Conventional converter systems with explicit sign measurement circuits that were necessary for the commutation in the past are discussed. New operation methods eliminating these extra measuring circuits are presented. The paper explains the new methods. Advantages and disadvantages of different approaches are discussed. The robustness of the new methods against disturbance is proved and measurements on a 5.5-kW matrix converter system are shown.

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Inverter-fed drives will be used more and more frequently for variable speed drive applications with high dynamics. For saving braking energy and reduction of cooling effort it is useful to deploy selfcommutated line side converters even in low power applications. The method proposed in this paper allows to synchronise the converter to the grid without sensing the line voltage. Hence additional hardware for voltage sensing is not necessary. Furthermore the implementation of this method on a microcontroller system is presented.