Analysis of Sag Conditioning with DVR in Three Phase Supply

The dynamic voltage restorer has been gaining acceptance as an effective device for voltage sag compensation. The compensation capability of a dynamic voltage restorer (DVR) depends primarily on the maximum voltage injection ability and the amount of stored energy available within the restorer. Voltage sag is the phenomenon occurring in distribution system. It is the decrease in r m s voltage for a short duration. The D V R is a power electronic device that is used to inject a three phase voltage in series and in synchronism with the distribution feeder voltages in order to compensate for voltage sag. In this paper shows the operation of D V R. The power circuit of a D V R with control techniques used for compensation of sag, swell, harmonics is explained. The D V R control system is explained and verified using simulation. Power quality disturbances is the major concern in the distribution system, that leads to tripping and malfunction of sensitive equipment in distribution system. A D V R can be used to mitigate the power quality issues by injecting/absorbing real and reactive power to the point of connection (PCC). This study presents how the D V R used to compensate the voltage sag, voltage swell, power factor problems and harmonics and thus to improve the distribution system performances. The complete model is subjected to, first without ANN and then with it using A N N. The results obtained in both the cases are analysed and found that proposed device quickly recognize the disturbances and correct all the power quality issues by injecting/absorbing the real/reactive power during power quality events with no/less distortions than conventional system. Keywords— Dynamic voltage restorer, artificial neural network, voltage source inverter, ultra capacitor, point of common coupling, insulated gate bipolar transistor.

[1]  Mike Barnes,et al.  Dynamic voltage restorer with battery energy storage for voltage dip mitigation , 2000 .

[2]  R. Omar,et al.  Power quality improvement in low voltage distribution system using Dynamic Voltage Restorer (DVR) , 2010, 2010 5th IEEE Conference on Industrial Electronics and Applications.

[3]  F.Z. Peng,et al.  Z-source inverter , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[4]  D.M. Vilathgamuwa,et al.  Interline dynamic voltage restorer: a novel and economical approach for multiline power quality compensation , 2004, IEEE Transactions on Industry Applications.

[5]  Chandra Babu Naidu,et al.  Voltage Sag and Mitigation Using Dynamic Voltage Restorer ( DVR ) System for Power Quality Improvement ” , 2017 .

[6]  Pankaj Dahire,et al.  Simulation of D-Statcom and Dvr in Power Systems , 2013 .

[7]  Mike Barnes,et al.  Dynamic voltage restorer based on voltage space vector PWM control , 2001, APEC 2001. Sixteenth Annual IEEE Applied Power Electronics Conference and Exposition (Cat. No.01CH37181).

[8]  F. Blaabjerg,et al.  Control and testing of a dynamic voltage restorer (DVR) at medium voltage level , 2003, IEEE Transactions on Power Electronics.

[9]  A. Mohamed,et al.  Photovoltaic Based Dynamic Voltage Restorer For Voltage Sag Mitigation , 2007, 2007 5th Student Conference on Research and Development.

[10]  Nasrudin Abd Rahim,et al.  New control technique applied in dynamic voltage restorer for voltage sag mitigation , 2009, 2009 4th IEEE Conference on Industrial Electronics and Applications.

[11]  S.H. Hosseini,et al.  Mitigation of Voltage Sag Using Adaptive Neural Network with Dynamic Voltage Restorer , 2006, 2006 CES/IEEE 5th International Power Electronics and Motion Control Conference.

[12]  Math Bollen,et al.  Understanding Power Quality Problems: Voltage Sags and Interruptions , 1999 .

[13]  Wafi Danesh,et al.  A Review of Neural Networking Methodology to Different Aspects of Electrical Power Systems , 2011 .

[14]  D. Salomonsson,et al.  Automated Control Technique for a Single Phase Dynamic Voltage Restorer , 2006, 2006 International Conference on Information and Automation.

[15]  E. Ashokkumar,et al.  An Integrated Dynamic Voltage Restorer-Ultra capacitor Design for Improving Power Quality of The Distribution Grid , 2016 .

[16]  F. Jurado,et al.  Voltage sag correction by dynamic voltage restorer based on fuzzy logic control , 2003, CCECE 2003 - Canadian Conference on Electrical and Computer Engineering. Toward a Caring and Humane Technology (Cat. No.03CH37436).

[17]  E. Acha,et al.  A Versatile Control Scheme for a Dynamic Voltage Restorer for Power-Quality Improvement , 2009, IEEE Transactions on Power Delivery.