正弦波電源電流をもつ三相昇降圧電流形整流器

抄録

This paper presents three-phase current-source rectifier, which is based on the cascade combination of buck-boost and buck DC-DC converters and has the step-up and step-down characteristics of output current, whereas the conventional current-source rectifiers have no step-up characteristics. The introduction of pulsewidth modulation makes it possible to obtain the widely controllable output current and to sinusoidally waveshape the supply currents with a near unity power factor. Three insulated-gate bipolar transistors (IGBTs) provide the necessary control over the currents for unidirectional power flow. To countract the oscillatory transient operations with single-loop output current feedback, the tested system includes the minor loop for the current in flyback inductor. The controllability of the output current is examined for the variation in its reference. The experimental results and state-space simulations for steady-state and transient conditions confirm the relevance of the presented configuration as an useful rectifier with near unity power factor sinusoidal supply currents and satisfactory output current regulation.