Traditionally, the vector operation technique has been used to control three-phase converters using one cycle control. In this paper, a three-phase active power filter large-signal model with vector operation technique in a new coordinate system is presented. By using the vector operation technique, only two phase-legs are switching at high frequency, thus reducing the switching losses. This paper not only covers the literature gap about the modeling of three-phase converters using vector operation, but also presents a sliding mode control for this converter. The con- trol scheme consists of a nonlinear matrix transformation in order to obtain the voltages and currents in a new two- dimensional frame, ¿¿-frame, a sliding mode controller de- signed in these coordinates, and a modulator to obtain the control signals in natural frame. The sliding mode control is designed with the help of the presented large signal model assuring sinusoidal grid currents in phase with the grid voltages. This controller, provides a fast transient response against sudden load changes with a good current tracking capability and a reduction of the switching losses. A stability analysis is performed in order to validate the control parameters. Experimental results are provided using a fully-digital control system in order to validate the performances of the proposed controller.

Peer Reviewed