Nitin Aggarwal

 Department of  Electrical & Electronics Engg., Haryana college Of Technology & Management, Kaithal[Haryana],India.


 Department  of  Electrical & Electronics Engg.,

Haryana college Of Technology & Management, Kaithal [Haryana], India.

Arvind Dewangan

Department. of Civil Engg.,

Haryana college Of Technology & Management,


Prakash Kumar Dewangan

 Department. of  Electrical Engg.,

Kirodimal Institute of Technology, Raigarh[Chattisgarh],India.


 A Power quality problem is an occurrence manifested as a nonstandard voltage, current or frequency that results in a failure or a mis-operation of end user equipments. Utility distribution networks, sensitive industrial loads and critical commercial operations suffer from various types of outages and service interruptions which can cost significant financial losses. These power quality associated problems are voltage sag, surge, flicker, voltage imbalance, interruptions and harmonic problems. These power quality issues may cause problems to the industries ranging from malfunctioning of equipments to complete plant shut downs. Those power quality problems affect the microprocessor based loads, process equipments, sensitive electric components which are highly sensitive to voltage level fluctuations. In developing countries like India, where the variation of power frequency and many such other determinants of power quality are themselves a serious question, it is very vital to take positive steps in this direction. To overcome the problems caused by customer side abnormalities so called custom power devices are connected closer to the load end.

One such reliable customer power device used to address the voltage sag, swell problem is the Dynamic Voltage Restorer (DVR). It is a series connected custom power device, which is considered to be a cost effective alternative when compared with other commercially available voltage sag compensation devices.

The main function of the DVR is to monitor the load voltage waveform constantly and if any sag or surge occurs, the balance (or excess) voltage is injected to (or absorbed from) the load voltage. To achieve the above functionality a reference voltage waveform has to be created which is similar in magnitude and phase angle to that of the supply voltage.

This paper reveals a new control technique to detect and compensate for the single phase voltage sag. The simulation was checked in Matlab Simulink/Power System Block set (PSB) simulation software and has shown reliable results.

Keywords: DVR, voltage dips, swells, outage, interruption, power quality, VSC.

       Sub Area: Power System [DVR]

       Area:   Electrical Engineering



International eJournal of Mathematics and Engineering

Volume 1, Issue 1, Pages 15-31