Advantages of using the Matrix Converter

This section summarises some of the advantages of using the matrix converter in the control of an induction wind turbine generator.

For a low output frequency of the converter the thermal stresses of the semiconductors in a conventional inverter are higher than those in a matrix converter. This arises from the fact that the semiconductors in a matrix converter are equally stressed, at least during every period of the grid voltage, while the period for the conventional inverter equals the output frequency. This reduces the thermal design problems for the matrix converter.

Although the matrix converter includes six additional power switches compared to the back-to-back PWM-VSI, the absence of the DC-link capacitor may increase the efficiency and the lifetime for the converter (Schuster, 1998).

Depending on the realization of the bi-directional switches, the switching losses of the matrix inverter may be less than those of the PWM-VSI, because the half of the switchings become natural commutations (soft switchings) (Wheeler & Grant, 1993).

Compared to converters with constant DC-link voltage and only two output levels, the output harmonic content of the matrix converter is lower, due to the fact that the output voltage of the matrix converter is composed of three voltage levels.

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