Phd Thesis Matrix Converter

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Their response is instantaneous and automatically adapts to the changes during abnormal conditions.

The increased complexity of their control and usage of more number of elements leads to the discovery of new type of converter called matrix converter which is very simple and compact.

Basically a matrix converter consists of nine bi-directional switches, which are required to be commutated in the right way and sequence in order to minimize losses and produce the desired output waveforms with high quality.

The Factors such as the absence of bulky electrolytic capacitors, reduction in size and weight of the converter, increasing power density, and obtaining almost sinusoidal nature of output wave forms are the most important characteristics of matrix converter.

The matrix converter was firstly introduced in the year 1976 by Venturini and Alesina with their intensive research on MC's and they proposed a generalised highfrequency switching strategy with huge mathematical background in 1980.

They have represented the power circuit of the converter as a matrix.

In order to obtain maximum voltage transformation ratio, gate signals are used to driven the bidirectional switches by using optimum amplitude venturini method.

The matrix converter is a single-stage converter with m × n bidirectional semiconductor power switches that mainly connects each m-phase voltage source to an n-phase load.

The other topology called matrix converter for 3 AC/AC power converter replaces the diode bridge with PWM rectifier resulting in a back-to-back converter .

This converter overcomes the input harmonic problem of the former topology and offers improved total input power factor and bi-directional power flow.

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