Power Electronics Matrix Converters - Power Electronics

What are Matrix Converters in Power Electronics?

Matrix converter can be defined as a converter with a single stage of conversion which makes use of bidirectional controlled switch for attaining the automatic power conversion from AC to AC. It offers an alternative to PWM voltage rectifier (double sided).

Matrix converters can be distinguished by the sinusoidal waveforms which demonstrate the input and output switching frequencies. Bidirectional switches help in having a convenient power factor input and in addition to this; lack of DC links makes sure that it has a compact design. Disadvantage to matrix converters is that they will not have fully controlled bilateral switches to operate at high frequencies. Its voltage ratio that is output to input voltage is limited.

Matrix converter control has three methods

  • Space vector modulation
  • Pulse width modulation
  • Venturi - analysis of function transfer

The Matrix Converter Circuit

Below diagram shows a single-phase matrix converter.

matrix_converter_circuit.jpg

It consists of four bi-directional switches where every switch has the ability to conduct in both forward blocking and reverse voltage.

Space Vector Modulation (SVM)

SVM is an algorithm method which is used for controlling the PWM. It will create AC waveforms which drive AC motors at various speeds. In the case of a three-phase inverter which has DC supply power, its three main legs at the output will be connected to a 3-phase motor.

Switches will be controlled to make sure that no two switches in the same leg are ON together. Concurrent ON states may result in the DC supply shorting. This may lead to eight switching vectors where two are zero and six are active vectors for switching.

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