scholarly journals Compensation of Voltage Sags and Swells Using Dynamic Voltage Restorer Based on Bi-Directional H-Bridge AC/AC Converter

Processes ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1541
Author(s):  
Yu-Kai Chen ◽  
Xian-Zhi Qiu ◽  
Yung-Chuna Wu ◽  
Chau-Chung Song
Keyword(s):  
Single Phase ◽  
Control Method ◽  
Gain Control ◽  
Voltage Sags ◽  
Dynamic Voltage Restorer ◽  
Line Voltage ◽  
Loop Control ◽  
Voltage Restorer ◽  
Dynamic Voltage ◽  
Voltage Swells

In this paper, the compensation of voltage sags and swells using a dynamic voltage restorer (DVR) based on a bi-directional AC/AC converter is presented for stabilizing single-phase AC line voltage. The H-bridge AC/AC converter with bi-directional switches and without bulk capacitor is adopted as the power topology of the proposed system. The proposed novel topology of DVR is adopted to compensate both voltage sag and swell conditions. Additionally, the power factor is closed to unity because a bulk capacitor is not required. The inner and outer loop control is proposed to improve the response with gain scaling; gain control is adopted to reduce the overshoot. Finally, a 2 kVA prototype has been implemented to verify the performance and accuracy of the control method for the DVR system. The peak efficiency of the system is up to 94%, and it can compensate 50% voltage swells and 25% voltage sags.

scholarly journals PV integrated single-phase dynamic voltage restorer for sag voltage, voltage fluctuations and harmonics compensation

2020 ◽  
Vol 11 (1) ◽  
pp. 547
Author(s):  
Toufik Toumi ◽  
Ahmed Allali ◽  
Othmane Abdelkhalek ◽  
Abdallah Ben Abdelkader ◽  
Abdelmalek Meftouhi ◽  
...  
Keyword(s):  
Single Phase ◽  
Control Method ◽  
Sliding Mode ◽  
Power Source ◽  
Voltage Source ◽  
Dynamic Voltage Restorer ◽  
Phase Dynamic ◽  
Voltage Restorer ◽  
Dynamic Voltage ◽  
Bus Voltage

<span>This document proposes a photovoltaic (PV) based single-phase dynamic voltage restoration (DVR) device, it eliminates both sag and swell voltage and compensates for power. The proposed system requires a power source to compensate for the sag/swell voltage. This system has found a simple topology for the DVR that uses PV with two DC-DC boosts converters as the DC power source for the dynamic voltage conservator. The DC/DC boost converter powered by the PV generator is used to increase the voltage to meet the DC bus voltage requirements of the single-branch voltage source inverter (VSI). This system uses renewable energy; saves energy accordingly and supplies power to critical/sensitive loads. The control method used in this work is a Sliding Mode Control (SMC) method and relies on a phase locked loop (PLL) used to control the active filter. The effectiveness of the suggested method is confirmed by the MATLAB/Simulink® simulation results and some prototype experiments. These results show the capacity of the proposed DC link control.</span>

scholarly journals Control DC link of single-phase dynamic voltage restorer

2020 ◽  
Vol 9 (3) ◽  
pp. 297
Author(s):  
Toumi Toufik ◽  
Allali Ahmed ◽  
Abdelkhalek Othmane ◽  
Soumeur Mohammed Amine ◽  
Nasri Abdelfatah
Keyword(s):  
Power Flow ◽  
Single Phase ◽  
Control Method ◽  
Distribution Grid ◽  
Dynamic Voltage Restorer ◽  
Long Run ◽  
Voltage Restorer ◽  
Dynamic Voltage ◽  
Source Voltage ◽  
Bidirectional Power Flow

This paper is aimed to illustrate and expose the performance of single-phase voltage dynamic voltage restorer (DVR) control connected to the electrical distribution grid. This performance is easily expressed by compensating for the sags and the swells voltages, and regulating the voltage across the load by injecting a voltage component in series with the source voltage increased or decreased with respect to the source voltage the load-side waveforms are purely sinusoidal. The integration of serial and chopper converters makes  the DVR capable of bidirectional power flow. The key to this topology is its ability to compensate for sagging and swelling of the voltage in the long run. The modeling of the DVR and the design of its controller is included in this document. Effectiveness of control systems and start-up sequence of DVR operation is verified by detailed simulation studies. The control method used in this work is based on the use of a booster chopper and two cascade loops  to generate the PWM command to control the chopper. The effectiveness  of the suggested method is confirmed by the MATLAB/SIMULINK® simulation results and some prototype experiments. These results show  the capacity of the proposed DC link control.

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