Admittance Modeling, Analysis, and Reshaping of Harmonic Control Loop for Multiparalleled SAPFs System

Liu, Kangli; Cao, Wu; Wang, Shunyu; Kang, Haotian; Zhao, Jianfeng; Wu, Mumu; Fan, Dongrui

doi:10.1109/tii.2020.2968374

Cited by 22 publications

(12 citation statements)

References 34 publications

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“…Its basic working principle is that the SAPF main circuit inputs a compensation current equal in magnitude and opposite in direction to the nonlinear load harmonic current so that the harmonic current and the compensation current cancel each other (Li et al, 2021), and the final grid-side current is equal to the fundamental component of the nonlinear load current, which is close to the standard sine wave (Liu et al, 2021).…”

Section: Related Workmentioning

confidence: 99%

Immunity of shunt active power filter based on improved LADRC

Yin

2023

Transactions of the Institute of Measurement and Control

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To improve the dynamic response speed and performance of active power filter controller, and improve the robustness, tracking ability, and disturbance rejection ability of linear active disturbance rejection controller (ADRC), an improved linear ADRC (LADRC) is proposed. First, a new error adjustment total disturbance is introduced into the linear expansion state observer to adjust the total disturbance of the linear expansion state observer. Then, on the premise of system stability, the controller is applied to the voltage outer loop of shunt active power filter (SAPF), and the mathematical model of active power filter is deduced, and it is controlled according to the first-order linear active disturbance rejection controller. Finally, through frequency domain analysis, the stability, noise immunity, and tracking performance of the improved LADRC are analyzed. Using MATLAB and Simulink simulation platform, the current stability and tracking performance of SAPF under improved LADRC control are simulated and verified, and compared with traditional methods. The simulation results show that the waveform fluctuation of A-phase voltage on the grid side of this method is relatively smooth, and the voltage on the grid side is always kept at ±50 V; the voltage curve of SAPF DC side is kept between the actual set values, about 820 V; the waveform fluctuation of A-phase current on the load side is small, which is ±220 A; the harmonic distortion rate is 4%. It is verified that this method has good tracking effect and anti-interference characteristics, which is of great significance to improve the control performance of active power filter.

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Section: Related Workmentioning

confidence: 99%

Immunity of shunt active power filter based on improved LADRC

Yin

2023

Transactions of the Institute of Measurement and Control

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“…Literatures [31][32][33][34][35][36] investigate the issue of harmonic oscillation in SAPF systems with selective harmonic current detection and points out the interaction between source impedance, SAPF, and non-linear loads. They uniformly concluded that the resonance peak of the source impedance located near the harmonic compensation frequency is the cause of harmonic oscillation.…”

Section: Introductionmentioning

confidence: 99%

“…Although sufficient explanation for harmonic oscillation has been proposed, these studies tended to consider the nonlinear load as a Norton model, which means that the dynamic behaviour of the non-linear load cannot be well characterized [32]. In addition, the stabilization strategies proposed for harmonic oscillation mainly focus on active damping schemes [34,35] or sacrificing the harmonic compensation effect in exchange for stability [31,34], which may lead to reappearing instability in case of unpredictable changes in the system parameters [37].…”

Section: Introductionmentioning

confidence: 99%

Analysis and stabilization for full harmonic compensation oscillation in SAPF system with source current direct control

Xie,

Yi,

Zhuo

et al. 2023

IET Power Electronics

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Shunt active power filter (SAPF) has emerged as a promising solution for mitigating harmonic distortions. Due to the interaction between the current inner‐loop of SAPF, source impedance and non‐linear loads, harmonic oscillation issue arises and adversely affects the stability of the system, thus in turn exacerbating the harmonic distortion. However, previous studies paid less attention to the value of phase adjustment in improving the dynamic behaviour of the loop and thus stabilizing harmonic oscillation. Taking the dynamic characteristics between source impedance and non‐linear load into consideration, this paper models and analyzes the SAPF system with source current direct control to reveal the law of full harmonic compensation oscillation. Based on the analysis, an enhanced phase adjustment strategy using load current feedforward is proposed and designed to stabilize harmonic oscillation, while maintaining a favourable trade‐off between stability and harmonic compensation performance. The small‐signal model validated for stability analysis and the effectiveness of proposed stabilization strategy are verified by simulation and experiment.

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“…With the rapid development of modern industry and economy, the power quality in the distribution network is deteriorating because of numerous types of power electronic equipment [1]. Meanwhile, with the emerging new energy distributed generation, the microgrid, and other advances, because of the poor bearing and regulation capacity of the power grid as well as the problems of low-voltage ride-through and the large number of nonlinear converter devices, reactive power, harmonics, imbalance, and other power quality issues also need to be managed.…”

Section: Introductionmentioning

confidence: 99%

Research on Oscillation Suppression Methods in Shunt Active Power Filter System

Hou

Wang

et al. 2022

Energies

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The shunt active power filter (SAPF) system oscillation is a massive threat to the security and stability of the power grid. This study classifies SAPF oscillation into two categories according to the difference in mechanisms. The SAPF oscillation in one category is caused by the resonant characteristics of a switching noise filter and is called external loop amplification. The SAPF oscillation in the other category is induced by the presence of a capacitor in the load current for SAPF and is called self-excited oscillation. Unlike previous studies, this study tried to reveal the internal relationship between the two kinds of SAPF oscillation, present a general shunt virtual-damping-based SAPF oscillation suppression strategy covering the previous resonant damping method, and provide the discrete domain stability criterion of the control system. The sampling frequency was at least six times the resonant frequency. The stability region was enlarged with an increase in the sampling frequency and narrowed with a rise in the resonant frequency. As to the harmful self-excited oscillation problem, this study proposes a composite control strategy combining selective harmonic compensation and grid-side current feedback. Moreover, this study considers the more general resistance–inductance–capacitance load situations and analyzes the stability of the SAPF–Thyristor Switched Capacitor (TSC) hybrid compensation system. Simulations and experiments demonstrated that the proposed compound control method can reduce the primary harmonics of the system by more than 90% and has a better oscillation suppression performance than previous suppression methods. In particular, if we selected the TSC series reactance rate following more than 6%, self-excited oscillation could usually be avoided.

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Admittance Modeling, Analysis, and Reshaping of Harmonic Control Loop for Multiparalleled SAPFs System

Cited by 22 publications

References 34 publications

Immunity of shunt active power filter based on improved LADRC

Immunity of shunt active power filter based on improved LADRC

Analysis and stabilization for full harmonic compensation oscillation in SAPF system with source current direct control

Research on Oscillation Suppression Methods in Shunt Active Power Filter System

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