Virtual Variable Sampling Discrete Fourier Transform Based Selective Odd-Order Harmonic Repetitive Control of DC/AC Converters

Liu, Zhichao; Zhang, Bin; Zhou, Keliang; Wang, Jingcheng

doi:10.1109/tpel.2017.2764020

Cited by 44 publications

(7 citation statements)

References 32 publications

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“…Nevertheless, PI+RC performance is degraded with grid frequency variations. Thus, PI+RC with frequency adapting capabilities is preferred, even though such enhancements increase the computational burden too [24][25][26].…”

Section: Renewablementioning

confidence: 99%

Inverter harmonic perturbations rejection in renewable energy conversion systems applying a super‐twisting algorithm

Memije

Carranza

Rodriguez

et al. 2021

IET Renewable Power Gen

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Grid background and dead-time harmonic perturbations pose challenges in maintaining power quality and stability in the grid integration of renewable energy conversion systems. Therefore, a super-twisting algorithm with the ability to reject harmonic perturbations on three-phase grid-tied inverters is proposed. The algorithm design is related to dead-time and grid background harmonics so that robust performance is achieved under these perturbations. To highlight the advantages of the proposed algorithm, it is compared against proportional-integral (PI) control in several dead-time and grid background harmonic sweeps. The maximum inverter current distortion obtained with PI control in simulation is 15.53%. However, by using the proposed algorithm instead, the maximum current distortion is reduced to 1.8%. Dead-time is experimentally swept by using a permanent magnet motor as a harmonic-free grid. Experimental results of grid background harmonics are obtained by injecting reactive energy into a grid with 2.19% voltage distortion. When PI control is used in the experimental setup, the maximum inverter current distortion obtained is 11.4%. However, with the proposed algorithm, the maximum current distortion is reduced to 1.5%, which complies with the standard IEEE 1547-2018. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Renewablementioning

confidence: 99%

Inverter harmonic perturbations rejection in renewable energy conversion systems applying a super‐twisting algorithm

Memije

Carranza

Rodriguez

et al. 2021

IET Renewable Power Gen

View full text Add to dashboard Cite

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“…In [4], the control variables are updated depending on the phase of the grid voltage to reflect the grid frequency deviations in the average period delay unit. In [5] the Virtual Variable Sampling (VVS) method, which creates an adjustable virtual delay unit to closely approximate a variable sampling delay, is proposed to allow the discrete Fourier transform based selective harmonic RC to be frequency adaptive. In a quite similar manner, a frequency adaptive virtual variable sampling-based RC is proposed in [6], considering an integer ratio between the fundamental frequency and the RC sampling.…”

Section: Introductionmentioning

confidence: 99%

Constant Delay-Line Repetitive Control Analysis for Variable Frequency Operation

Faro

Benedetto

Lidozzi

et al. 2022

IEEE Open J. Power Electron.

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The proposed paper deals with the complete analysis which is the basis of the common tuning procedure of variable sampling Repetitive Controllers for adjustable output frequency applications. The described approach can be applied without limitations to grid-tied inverters (narrow frequency variations), as well as to AC waveform generators (wide frequency variations). The operation of the proposed approach is to keep the Repetitive Control main delay line at a constant size, resulting in a very suitable implementation on FPGA-based control platforms. The effects of the desynchronization between the PWM modulator and the Control Loop will be accurately described, and the inherent delays will be expressed in closed form. Additional effects, like beating frequencies, are illustrated as well and described by closed-form expressions. Experimental verification is carried out to prove the effectiveness of the presented analysis.

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“…Zou et al (2015); Zhao et al (2019) propose a fractional compensation repetitive controller; Zou et al (2015) use the FIR filter; and Zhao et al (2019) use the IIR filter to compensate the fractional part of the ratio of the sampling frequency to the harmonic fundamental frequency in a digital system, to improve the suppression accuracy of RC. Different from the fractional compensation repetitive control, Liu et al (2019); Liu et al (2018) propose a virtual variable sampling (VVS) RC, which constructed a virtual sampling period without changing the physical sampling frequency of the system, and achieves the same effect as changing the physical sampling frequency. It provides a flexible and basic solution for non-integer delay unit of digital RC.…”

Section: Introductionmentioning

confidence: 99%

Harmonic vibration moment suppression using hybrid repetitive control for active magnetic bearing system

Cui

Zhou

et al. 2021

Journal of Vibration and Control

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The active magnetic bearing system exhibits mass imbalance and sensor runout which cause the system to generate harmonic vibration force and moment. Repetitive control is an effective method to eliminate such harmonic vibration. Traditional repetitive control will eliminate all of the harmonic frequency components. However, in a practical system, the odd harmonic components usually dominate. Meanwhile, the existing method only suppresses the vibration force in the magnetic bearing system, and there is little research on the suppression of moment. Aiming at these problems, the harmonic vibration moment of the active magnetic bearing system is taken as the control object. This study investigates a hybrid control method that combines a second-order odd harmonic repetitive control with finite-dimensional repetitive control. And the virtual variable sampling is applied to construct any virtual sampling period in the proposed method, which effectively solves the problem of non-integer delay of digital repetitive control. The stability of the active magnetic bearing system is analyzed. The experimental results show that this method has faster response speed and better robustness when the frequency fluctuates.

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Virtual Variable Sampling Discrete Fourier Transform Based Selective Odd-Order Harmonic Repetitive Control of DC/AC Converters

Cited by 44 publications

References 32 publications

Inverter harmonic perturbations rejection in renewable energy conversion systems applying a super‐twisting algorithm

Inverter harmonic perturbations rejection in renewable energy conversion systems applying a super‐twisting algorithm

Constant Delay-Line Repetitive Control Analysis for Variable Frequency Operation

Harmonic vibration moment suppression using hybrid repetitive control for active magnetic bearing system

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