Abstract
This paper focuses on the improvement of the harmonic distortion for MHz-operated discontinuous current mode single-phase grid-tied inverter under feed-forward current control. Two harmonic current reduction strategies are proposed. A feedback path, which is used to compensate for the low-order harmonics, is added to the conventional feed-forward structure; and an improved modulation, is proposed to minimize the influences caused by the resonance current during zero current period. The proposed method was verified by the experiment with a fabricated prototype. The total harmonic distortion (THD) of the output current with the maximum current operation was reduced from 7.3% to 4.5%, after the proposed method was applied. It is also shown that chip inductors can be a promising choice for MHz-class discontinuous current mode low-power inverters.
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