Control and implementation of a new modular matrix converter

Abstract

Implementation of a new modular AC-AC matrix converter and its control system are described. The converter consists of a matrix connection of capacitor-clamped H-bridge switch cells. The AC output of each switch cell can assume three voltage levels during conduction. Input and output three-phase AC waveforms are synthesized from pulse-width modulation of the DC clamp capacitor voltages. The space-vector modulation approach can be adapted to control this converter. A control algorithm is described that can be reduced to an equivalent DC-link converter. This controller is implemented using programmable logic devices and a flash-memory look-up table. Operational waveforms are presented.