Virtual delay unit based digital nk ± m-order harmonic repetitive controller for PWM converter

Liu, Zhichao; Zhang, Bin; Zhou, Keliang

doi:10.1109/icit.2017.7913091

Cited by 2 publications

(3 citation statements)

References 24 publications

(18 reference statements)

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“…Recently, the virtual delay unit concept was developed [16], [17], [20], which enables the virtual variable sampling (VVS) control. As an emerging technique, the VVS has some limitations that should be addressed.…”

Section: Introductionmentioning

confidence: 99%

“…One major limitation is its performance degradation under frequency fluctuations. To tackle this problem, the virtual delay unit in [20] approximates the fractional delay due to frequency variations based a linear interpolation method, which requires heavy computation for a large number of delays and it is only suitable for a limited range of frequency mismatches. Accordingly, this paper extends the VVS control and proposes a frequency adaptive VVS-based SHRC (FA-VVS-SHRC) scheme to enable a low-cost and flexible solution.…”

Section: Introductionmentioning

confidence: 99%

“…By doing so, the FA-VVS-SHRC can accurately compensate for power harmonics distortions in the presence of a fractional ratio of N/n due to the fundamental frequency variations and/or the hardware limitations. It thus provides a generic and robust solution to the fractional delay unit issue of digital RC schemes [16], [20]. Experiments on a three-phase pulse width modulation (PWM) inverter (i.e., a 6-pulse inverter) are presented to demonstrate the effectiveness of the proposed method in dealing with frequency fluctuations.…”

Section: Introductionmentioning

confidence: 99%

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Frequency-Adaptive Virtual Variable Sampling-Based Selective Harmonic Repetitive Control of Power Inverters

Liu

Zhou

Yang

et al. 2021

IEEE Trans. Ind. Electron.

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Due to the n-pulse commutation, the power harmonic distortions caused by power inverters usually concentrate on particular (nk ± m)-order harmonic frequencies. The conventional repetitive control (RC) uses an identical gain to equally compensate for the distortions at all harmonic frequencies. This leads to slow dynamics as it fails to optimize the convergence rate of the RC at dominant harmonic frequencies. The selective harmonic RC (SHRC) can efficiently suppress dominant power harmonic distortions. However, the ratio of the sampling rate of the SHRC to the fundamental frequency must be an integer. This severely limits the use and lowers the performance of the SHRC with a fixed sampling rate in the presence of frequency variations of interested harmonics. To address this problem, this paper proposes a frequency adaptive virtual variable sampling-based SHRC (FA-VVS-SHRC) scheme that is immune to the issue of the fractional ratio of the sampling rate to the interested harmonics. The proposed FA-VVS-SHRC scheme can provide flexible fractional phase lead compensation to achieve accurate power harmonic control in the presence of frequency variations. Moreover, it is a low-cost and easy-to-implement solution that does not require hardware modifications. Experiments on a three-phase power inverter and comparison studies are presented to verify its effectiveness.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%