This document discusses voltage sag mitigation using a static synchronous compensator (STATCOM). It begins with an introduction to power quality issues such as voltage sags and describes how STATCOM can improve power quality through shunt compensation. Various voltage sag mitigation techniques are reviewed, including ferroresonant transformers, dynamic voltage regulators, static VAR compensators, sag-proofing transformers, static transfer switches, and energy storage options. The document proposes implementing a STATCOM in an induction generator-driven wind farm to mitigate voltage sags caused by load conditions. Diagrams show the load voltage with and without sags, as well as models of the wind farm system both with and without the STATCOM.

1. PRESENTED BY
J.SASITHAR
Guided By: Mr.A.RAJA
Dr. M.G.R. University

2. ABSTRACT
Power quality Issue : Injection of wind power to grid leads PQ
issues
What we are going to do??? Voltage Sag Mitigation
STATCOM : With the help of STATCOM by means of SHUNT
compensation
power quality can be improved

3. Power Quality Issues
Harmonic Distortion
Blackouts
Under voltage
Over Voltage
Voltage Sags
Transients
Surges

4. Power Quality Issues
Harmonic Distortion
Blackouts
Under voltage
Over Voltage
Voltage Sags
Transients
Surges

5. Voltage SAG
What is Voltage SAG???
…Reduction in Voltage for a Short time
Vtg reduction magnitude is B/W 10% - 90% of Normal RMS of Vtg
Sag stays for a time of Less than 1 minute
Voltage SAG

6. Voltage SAG
Faults
Motor Starting
Transformer Energizing
Heavy Load Switching
Power Saws ( User Load Sides )
Arc Welders ( User load Sides )

7. Voltage SAG
Serious Issue???
Disturbances caused by Voltage Sag Influence….
Production Loss of Customers & The Utility
Faults on Distribution System
User Loads equipments Malfunction

8. How To Determine VOLTAGE SAG?
During Voltage sag….
Resultant Impedance Changes
Voltage Based Method Used in this Project
Relation B/W Phase Angle Jump & Voltage Sag
Magnitudes of
Utility Network and Voltage Sag were compared

9. How To Determine VOLTAGE SAG
without PQ Meters?
 Lights Will Blink
Motors Slow Down and Returns to Normal speed
Computers Reboot Unexpectedly
Automated Equipments stops unexpectedly

10. Literature Review…..
 Statcom For Improved Dynamic Performance of Wind Farms in
Power Grid – G.Elsady , Y.A.Mobarak, A-R youssef
Improvement of Power Quality Considering Voltage Stability in
Grid connected System by Facts Devices-Sarika D Patil
Construction of a prototype D-Statcom for Voltage sag
Mitigation – Hendri Masdi , Norman Mariun
A BESS-Statcom based ctrl scheme for grid connected wind energy
system for power quality improvement- M.chiranjeevi

11. Generally used Mitigation Techniques
for Voltage SAG…
Ferro
Resonant
Transfor
mers
DVR
SVC
SAG
Proofing
Transfor
mers
STS
STATCOM

12. Some of the Energy Storage SAG
Mitigation Technologies…
Flywheels
Batteries
Capacitors
SMES

13. Ferro Resonant Transformer
Scheme…

14. Dynamic Voltage Regulator Scheme…

15. Static VAR Compensator Scheme…

16. SAG Proofing Transformer Scheme…

17. STS Scheme…

18. Proposed Scheme…..
STATCOM implementation in INDUCTION GENERATOR driven
wind farm
Implementation of SAG on network using LOAD
Mitigation of SAG using STATCOM

19. Line Model of wind farm without
STATCOM…

20. Load voltage with SAG conditions…..

21. STATCOM Implementation…..

22. Line Model of wind farm with
STATCOM…

23. Load voltage SAG Mitigation