Virtual Variable Sampling Repetitive Control of Single-Phase DC/AC PWM Converters

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

doi:10.1109/jestpe.2018.2862411

Cited by 26 publications

(11 citation statements)

References 38 publications

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“…Unlike VVS, such a control scheme accommodates frequency fluctuations by replacing fixed sampling period delays with VVS period delays. In [7] the same authors proposed a very similar control structure to be applied to a fullbridge inverter instead of a three-phase inverter. A different approach to managing the operation of RC under frequency variation is called the fractional delay method.…”

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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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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“…To address this issue, variable sampling frequency schemes provide a general and intuitive solution that can achieve a constant integer ratio of N/n in the presence of frequency variations [14]- [17]. However, variable sampling methods not only require DSP's special variable sampling programming capacity but also need to recalculate or re-tune other digital control parameters to maintain the system stability and robustness [18], [19].…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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“…The main advantage of an SISO solution is its simplicity and low cost because only one trace measuring output voltage with galvanic isolation is required. There have been some improvements to SISO using double control loops-a fast inner loop, e.g., a proportional-integral-derivative controller PID [8,9] or the coefficient diagram method (CDM) [10][11][12], and an outer loop that is only used to damp harmonic distortions, e.g., a repetitive controller (RPC) [13][14][15][16][17][18]. A repetitive controller is a discrete-time harmonic generator [14] that is plugged into the outer feedback loop, which works perfectly in the steady state The assignment of a linear or nonlinear plant model is the basic problem in control loop design.…”

Section: Introductionmentioning

confidence: 99%

Different Features of Control Systems for Single-Phase Voltage Source Inverters

Rymarski

Bernacki

2020

Energies

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The aim of this paper is to determine which type of control loop is better for each particular type of standard voltage source inverter (VSI) load (static, dynamic, nonlinear rectifier resistive-capacitive RC load). A comparison of three different types of controllers for single-phase VSIs is presented. The first two are of the single input single output (SISO)/proportional-integral-derivative controller (PID) and coefficient diagram method (CDM) types, and the third is of the multi-input single output (MISO)/passivity-based control (PBC) type. The selections of the gains for SISO and MISO controllers are presented, including the problem in the choice of PBC controller gains caused by the imperfection of the pulse width modulation (PWM) modulator. For a standard nonlinear rectifier RC load, the new control quality factor (CQF) is defined to distinguish the properties of the controllers. The results show the superiority of the MISO-PBC controller for the RC load; however, for a linear dynamic load, the MISO-PBC performed worse than the SISO-PID or CDM. Therefore, the choice between either a simple and inexpensive SISO with one measurement trace or an expensive MISO with three measurement traces depends on the purpose of the VSI. The initial simulations and measurements of the experimental models are presented and discussed.

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Virtual Variable Sampling Repetitive Control of Single-Phase DC/AC PWM Converters

Cited by 26 publications

References 38 publications

Constant Delay-Line Repetitive Control Analysis for Variable Frequency Operation

Constant Delay-Line Repetitive Control Analysis for Variable Frequency Operation

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

Different Features of Control Systems for Single-Phase Voltage Source Inverters

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