The repetitive control technique is widely adopted in ac systems, because of its excellent steady‐state tracking performance and low total harmonic distortion. The repetitive control method with one‐sixth of the system fundamental period T 0 as the delay time has been proposed to achieve fast transient response. In this study, an improved control scheme based on the T 0 /6 repetitive control is proposed for three‐phase grid‐connected inverters. The proposed scheme adopts T 0 /6 as the delay time in the positive‐rotating and negative‐rotating synchronous reference frames to suppress the 6 n ± 1 harmonics. Meanwhile, the proportional‐integral regulator and the plug‐in repetitive controller are combined to reinforce the system performance. A new auxiliary function based on the linear interpolation is proposed to maintain the ideal repetitive control performance when one‐sixth of the ratio of the sampling frequency to the grid fundamental frequency is non‐integer. The effectiveness of the proposed scheme on improving the T 0 /6 repetitive control is confirmed by simulation and experimental results finally.
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Chen et al. (2013) studied this question.
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