Mitigation of voltage sags and voltage swells by dynamic voltage restorer

2011 ◽  
Author(s):  
D. Rajasekaran ◽  
S. SekharDash ◽  
P. Vignesh
Keyword(s):  
Voltage Sags ◽  
Dynamic Voltage Restorer ◽  
Voltage Restorer ◽  
Dynamic Voltage ◽  
Voltage Swells

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.

Mitigation of Voltage Sags and Swells by Dynamic Voltage Restorer

2013 ◽  
Vol 768 ◽  
pp. 338-343 ◽  
Author(s):  
Shakti Prasad Mishra ◽  
Lisby Varghese ◽  
J. Preetha Roselyn ◽  
D. Devaraj
Keyword(s):  
Computer Simulations ◽  
Cost Effective ◽  
Test System ◽  
Modelling And Simulation ◽  
Control Technique ◽  
Voltage Sags ◽  
Dynamic Voltage Restorer ◽  
Suitable Test ◽  
Voltage Restorer ◽  
Dynamic Voltage

This paper presents the modelling and simulation of Dynamic Voltage Restorer (DVR) for mitigation of voltage sags and swells which are the major problems and issues on non linear loads.The Dynamic Voltage Restore (DVR) has become popular as a cost effective solutions for the protection of sensitive loads from voltage sags and swells.. The control of compensation voltages in DVR based on a-b-c to d-q-0 algorithm is discussed. The proposed control technique is cost effective and simple to design. Computer simulations are carried out in a suitable test system to investigate the effectiveness of control technique by using MATLAB/SIMULINK software.

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