Research on Power Characteristics of Matrix Rectifier

Abstract

The complete circuit model of a three-phase AC-DC matrix converter, namely matrix rectifier, is derived using circuit dq transformation method and based on current space vector algorithm, then the whole performances are analyzed systematically and entirely, including power characteristic, such as output voltage gain and polarity, input power factor, active power, reactive power and appearance power. The derived formulas are plotted into diagrams for comparative analysis. The operation conditions of unitary input power factor are also analyzed specifically, and the four quadrant working system and power characteristics are partitioned. It is shown that the converter is one of the flexible converters like three-phase to three-phase matrix converter with the following features: (1) output DC voltage can be regulated between positive and negative maximum values, with a maximum value of 1.5 input phase voltage amplitude and depending on input current displacement and load power; (2) its power switch circuit part is equivalent to an ideal transformer, capable of performing voltage, current and impedance conversion; (3) active power at mains is dependent on input current modulation index, input filter parameters, input current displacement and load power, so are reactive power and input power factor. (4) passive power control is dependent on active power at mains.