Delayed-Signal-Cancellation-Based Sag Detector for a Dynamic Voltage Restorer in Distorted Grids

Roldán-Pérez, Javier; García-Cerrada, Aurelio; Ochoa-Gimenez, Miguel; Zamora-Macho, Juan Luis

doi:10.1109/tste.2018.2877505

Cited by 29 publications

(13 citation statements)

References 42 publications

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“…The phase angle of the system voltage θ 0 , obtained by a phase locked loop (PLL), is considered as the reference. First, U DVRf can be obtained from either Equations (3), (7) or (15), and θ DVRf can be obtained from either Equations (2), (8) or (17), depending on the sag depth; then, the phase angle of U DVR is obtained through the combination of θ DVRf1 and θ 0 ; finally, the LCC-DVR reference voltage U* DVRa is generated based on θ DVR and U DVRf . To ensure the quality of the compensated voltage, a typical dual-loop proportional-integral (PI) controller is used for accurately tracking U* DVRa [21,31].…”

Section: Control Strategy Of Lcc-dvrmentioning

confidence: 99%

“…Various control strategies had been developed to control the DVR [11–14]. The in‐phase control strategy restores the load voltage magnitude by injecting a compensated voltage aligned with the grid voltage [11, 12, 15–18]. Although such control can reduce the inverter rating of a DVR system, high active power is demanded during the compensation period.…”

Section: Introductionmentioning

confidence: 99%

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Improved dynamic voltage restorer with reduced capacity of power inverter and energy storage for voltage sag mitigation

Guo

Zhu

et al. 2021

IET Power Electronics

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As one of the most representative series active compensators, dynamic voltage restorer (DVR) can solve voltage-related power quality uses effectively. The in-phase voltage control and energy-optimised control are the two typical control strategies of DVR. However, the in-phase voltage control results in a large amount of active power exchange between the main grid and the dc link of DVR, and hence high capacity of storage system is needed in the dc link while the energy-optimised strategy requires high injected voltage, resulting in oversizing of the DVR inverter. Thus, in order to avoid the aforementioned drawbacks, this study proposes a modified DVR, which connects an external capacitor in series with the LC filter (LCC) of DVR (LCC-DVR). Based on the operational principles of the LCC-DVR, an updated procedure of reference voltage is proposed to avoid overmodulation of DVR caused by load variations, ensuring the continuous operation capability of the LCC-DVR. The overall control scheme of the LCC-DVR and the comparative analysis among the proposed strategy and traditional strategies are also presented. The effectiveness of the proposed topology and method is clearly validated by the simulation and experimental results. 1 INTRODUCTION With the increasing penetration of distributed generation electric vehicle charging stations and rapidly changing loads, the distribution systems experience voltage-related power quality issues [1-4]. To increase voltage stability and power quality, an effective solution is to use a series active compensator [2, 5-7], such as the dynamic voltage restorer (DVR) [8-10]. Various control strategies had been developed to control the DVR [11-14]. The in-phase control strategy restores the load 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: Control Strategy Of Lcc-dvrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved dynamic voltage restorer with reduced capacity of power inverter and energy storage for voltage sag mitigation

Guo

Zhu

et al. 2021

IET Power Electronics

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“…In order to improve the dynamic response, many techniques have been proposed by researchers. Delayed signal cancellation PLL (DSC-PLL) has been proposed in recent times [40]. In this method, the signal is canceled by adding it to its time-delayed opposite phase version [41] [42].…”

Section: Fig 1 Block Diagram Of Sapfmentioning

confidence: 99%

Synchronization of Active Power Filter under Distorted Grid Conditions

Ullah

2021

IJRCS

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Advancement in technology has resulted in increased use of electrical energy. The trend of using energy-saving appliances is also increased considerably. Harmonic currents have been increased in power systems due to the large-scale use of nonlinear loads. Shunt Active Power Filter (SAPF) is the most widely used technique for the compensation of current harmonics. Under adverse grid conditions performance of SAPF is affected badly. In this paper, a modified synchronous reference frame theory is proposed for current reference generation by incorporating an advanced phase-locked loop technique for the estimation of frequency and phase. The proposed approach results in an accurate extraction of reference current in the presence of various grid disturbances. Matlab/Simulink environment is used for evaluating the performance. The results achieved show excellent performance of the proposed technique in terms of reducing harmonics distortion and dynamic response. The total harmonics distortion of the compensated source current is reduced to a value well within the limits of the IEEE-519 standard.

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“…Although various passive methods, for instance, connecting resisters in parallel or series with the capacitor, have been developed and can be employed to increase the system's physical damping, this kind of method is however not preferred, since it can further cause other issues, such as increase in power loss and deteriorated filter effectiveness for high-frequency voltage harmonics (Pal and Gupta, 2020;Vo Tien et al, 2018). On the contrary, the counterpart, i.e., active damping methods, is realized by modifying the control structure, which can avoid the aforementioned issues faced by the passive methods, and has therefore been intensively investigated in recent years (Suppioni et al, 2017;Liu et al, 2018;Roldán-Pérez et al, 2019;Liu et al, 2021;Xiong et al, 2021). Specifically, the following two types of control strategies: 1) single-loop voltage and 2) dual-loop voltage-current control, can be employed to achieve enhanced active damping.…”

Section: Introductionmentioning

confidence: 99%

Study of Voltage Sag Detection and Dual-Loop Control of Dynamic Voltage Restorer

Wang

Zhang

2022

Front. Energy Res.

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Voltages sags have become the major issue that prevents the customers from getting high-quality power supply, and the dynamic voltage restorer (DVR) is considered an effective way to solve this issue. In this work, a method for voltage sag detection implemented in the time-domain is firstly addressed, which features highly accurate and fast response. Then, the dual-loop voltage–current control for the DVR is intensively investigated. Specifically, the optimal tuning of the inner current loop to achieve the maximum active damping is approached, and the voltage controller implemented in the discrete-time is developed. Tuning of the voltage loop based on critical damping is also approached, which features reduced settling time and avoidance of overshoot. The simulation and experimental results have verified the effectiveness of the proposed method for detection and management of voltage sags.

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Delayed-Signal-Cancellation-Based Sag Detector for a Dynamic Voltage Restorer in Distorted Grids

Cited by 29 publications

References 42 publications

Improved dynamic voltage restorer with reduced capacity of power inverter and energy storage for voltage sag mitigation

Improved dynamic voltage restorer with reduced capacity of power inverter and energy storage for voltage sag mitigation

Synchronization of Active Power Filter under Distorted Grid Conditions

Study of Voltage Sag Detection and Dual-Loop Control of Dynamic Voltage Restorer

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