ABSTRACT
This paper deals with
modeling and simulation technique of a Dynamic Voltage Restore (DVR).The DVR is
a dynamic solution for protection of critical loads from voltage sags / swells.
The DVR restores constant load voltage and voltage wave form by injecting an
appropriate voltage. Present novel structure improves power quality by compensating
voltage sag and voltage swells. This paper discussed abc to dq0 base new
control algorithm to generate the pulse. The proposed control scheme is simple
to design and has excellent voltage compensation capabilities. Effectiveness of
proposed technique is investigated through computer simulation by using
MATLAB/SIMULNK software. The simulation results have shown validation of the control
system.
KEYWORDS
1. Power Quality
2. Voltage sags /swells
3.
DVR
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM
Fig. 1 Basic Principle of DVR
Fig. 2 Overall Control circuit of STATCOM
based on MATLAB Simulink
SIMULATION RESULTS
Fig. 4 Supply voltage, injected voltage,
load voltage and current for voltage swell effect
CONCLUSION
This
paper has proposed the modeling and simulation of DVR using simulink in MATLAB.
The very simple abc to dqo based control technique used. The
steps of developing DVR has been explained in depth. The performance of DVR is
studied under voltage sag /swells. The ability of the DVR to compensation of
voltage sag/swells has been verified. Simulation result show the DVR mitigates
voltage sag /swell very fast and satisfactory in terms of voltage regulation too.
The DVR has effectively handled injection of proper voltage component. It can
also compensate long duration voltage sag/swell.
REFERENCES
[1]Rakesh
Kantaria and S.K.Joshi “A review on power quality problems and solutions” Power
electronics National Conference November 2008.
[2]IEEE
Std. 1159 – 1995, “Recommended Practice for Monitoring Electric Power Quality.
[3]Yan
Li, Chengxiong Mao, Buhan Zhang, Jie Zeng, “Voltage Sag Study for a Practical
Industrial Distribution Network”, 2006 International Conference on Power System
Technology, pp.1-4, Oct., 2006.
[4]Understanding
FACTS: Concepts and Technology of Flexible AC Transmission Systems. Narain G.
Hingorani, Laszlo Gyugyi. Wiley IEEE press.
[5]
J. G. Nielsen, M. Newman, H. Nielsen,and F. Blaabjerg, “Control and testing of
a dynamic voltage restorer (DVR) at medium voltage level,” IEEE Trans.Power
Electron., vol. 19, no. 3,p.806,May 2004.
