A new reliable Single-Stage Single-Phase Ac-Ac Converter based Dynamic Voltage Restorer for Voltage Sag/Swell compensation

2020 ◽  
Author(s):  
Shabab Zahra ◽  
Muhammad Siddique ◽  
Jawad Hussain ◽  
Sumera Jabbar ◽  
Mughees Riaz
Keyword(s):  
Single Phase ◽  
Single Stage ◽  
Voltage Sag ◽  
Dynamic Voltage Restorer ◽  
Voltage Restorer ◽  
Dynamic Voltage

scholarly journals Direct Converter based DVR to Mitigate Single Phase Outage

2019 ◽  
Vol 8 (3) ◽  
pp. 85-88
Keyword(s):  
Single Phase ◽  
The Other ◽  
Voltage Sag ◽  
Two Phase ◽  
Dynamic Voltage Restorer ◽  
Voltage Restorer ◽  
Dynamic Voltage ◽  
Simulation Results ◽  
Series Transformer

The aim of this paper is to present a new simplified topology for a Dynamic Voltage Restorer (DVR) which has ability to mitigate single phase outage also. The proposed DVR has a multi-winding transformer, a direct converter and a series transformer for each phase. The multi winding transformer is connected between the direct converter and the grid. Only three bi-directional controlled switches are employed per phase. The direct converter is used to synthesis the required compensating voltage and the series transformer is used to add the compensating voltage in grid. The DVR can compensate balanced voltage sag, balanced swell, unbalanced swell and single phase outage by taking power from the grid. For compensating the voltage sag or outage in any one phase, the other two phase voltages are added using the multi winding transformer. The added voltage is pules-width modulated (PWM) using controlled switches to compensate the sag. Swell is compensated by taking power from the same phase. The simulation results confirm that the proposed topology can mitigate balanced sag of 50%, balanced swell of 100%, unbalanced swell of 100% and single phase outage.

scholarly journals Implementation of Single Phase SRF based Dynamic Voltage Restorer in Distribution System for Power Quality Improvement

2019 ◽  
Vol 8 (12) ◽  
pp. 3451-3456
Keyword(s):  
Power Quality ◽  
Power Supply ◽  
Single Phase ◽  
Positive Sequence ◽  
Voltage Sag ◽  
Phase System ◽  
Major Power ◽  
Dynamic Voltage Restorer ◽  
Voltage Restorer ◽  
Dynamic Voltage

Power Quality (PQ) is becoming an important issue as the increase in electricity use continues. Reduction in the quality of electrical power is due to various kinds of voltage related problems such as voltage sag, voltage swell, short-lived interruptions, harmonic distortions, notches, flickers, spikes and transients. The major power quality problems in single phase system are voltage sag and harmonics. The Mitigation of voltage sag and harmonics in single phase system under the distorted power supply situations was effectively eliminated with Dynamic Voltage Restorer (DVR). The single-phase SRFT (Synchronous Reference Frame Theory) was implemented in the controller design for DVR. DVR will produce required amount of instantaneous voltage to be injected. Designed controller technique will utilize the function of Moving Average Filter (MAF) for getting the fundamental quantity of positive sequence component from the disturbed supply voltage. Experimental results of DVR prove its effectiveness to mitigate voltage sag and harmonics during disturbed power supply condition.

Proposed on Transformer-Less Dynamic Voltage Restorer

2015 ◽  
Vol 785 ◽  
pp. 409-413
Author(s):  
Eimi Diyana Rosli ◽  
Rijalul Fahmi bin Mustapa ◽  
M.N. Hidayat
Keyword(s):  
Power Quality ◽  
Single Phase ◽  
Matrix Converter ◽  
Voltage Sag ◽  
Dynamic Voltage Restorer ◽  
Matlab Simulink ◽  
Voltage Restorer ◽  
Dynamic Voltage ◽  
Mitigation Methods ◽  
Mitigation Technique

Power delivered to consumer from utilities is susceptible to power quality problems. The most common power quality problems are voltage sag. Modern equipment nowadays are prone to problems associated with voltage sag. Such problems can be apprehended by several mitigation methods. This paper will discuss voltage sag mitigation method by eliminating the injection transformer in ordinary Dynamic Voltage Restorer (DVR) and applying Single Phase Matrix Converter (SPMC) in a single phase DVR topologies. The objective of this paper is to investigate the potential mitigation method without the injection transformer in the DVR topology. DVR circuit will be constructed and simulated using MATLAB/SIMULINK software. It is hoped that the result of this work will provide a simpler mitigation technique where existing DVR topology can be constructed with less component that provides unnecessary losses in the DVR itself.IndexTerms—Injection Transformer, DVR, SPMC, MATLAB/SIMULINK.

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