Soft-switched current-fed PWM inverter with space vector modulation

A soft-switched PWM power converter structure is presented, which is useful for current-fed inverters and rectifiers. Typical applications include power supplies for magnets and SMES systems, high-power AC motor drives and active power filters with magnetic energy storage. Soft switching, which is provided at the expense of a limited increase of the circuit complexity, makes possible commutation frequencies considerably higher than for hard-switched solutions. Moreover, full-range regulation of the AC currents is obtained, owing to a suitable current vector modulation technique. Lastly, a proper switching sequence is derived, which minimizes power loss and switch overvoltages. Simulated results demonstrate the power converter capabilities.<
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