Hybrid control scheme of power compensation and modulation for a three-phase to single-phase matrix converter with a small capacitor

This paper describes a novel power control scheme for a three-phase to single-phase matrix converter for a gas engine cogeneration system. This matrix converter has no dc link but a small capacitor for compensation of single-phase power pulsation. The capacitor also contributes to compensate reactive current of a generator. Additionally, modulation control of instantaneous three-phase power is applied to reduce capacitance of the compensation capacitor. According to this scheme, power pulsation is partially absorbed by rotor inertia of the generator and gas engine. In this paper, the proposed control scheme is described in detail including design method of compensation capacitor, and verified through numerical simulation and experiments.