DocumentCode :
3311170
Title :
A Practical Operation Strategy for STATCOM under Single Line to Ground Faults in the Power System
Author :
Bhattacharya, Subhashish ; Xi, Zhengping
Author_Institution :
Semicond. Power Electron. Center, North Carolina State Univ., Raleigh, NC
fYear :
2006
fDate :
Oct. 29 2006-Nov. 1 2006
Firstpage :
877
Lastpage :
883
Abstract :
The STATCOM (synchronous static compensator) based on voltage source converter (VSC) is used for voltage regulation in transmission and distribution systems. The STATCOM can rapidly supply dynamic VARs required during system faults for voltage support. Strict requirements of STATCOM losses and total system loss penalty preclude the use of PWM (pulse-width modulation) for VSC based STATCOM applications. This constraint of implementing VSC without PWM functionality, results in over-currents and trips of the STATCOM during and after system faults, when its VAR support functionality is most required. In this paper, we propose and develop an "emergency PWM" strategy to prevent over-currents (and trips) in the VSC during and after single line to ground system faults, and to ensure that the STATCOM supplies required reactive power. The operational results for a 48-pulse VSC based 150 MVAR STATCOM are presented to illustrate the problem during and after a system fault, and motivation for this work. Simulation results are presented for a 48-pulse VSC based 100 MVAR STATCOM connected to a 2-bus power system. Simulation results validate the "emergency PWM" strategy to prevent VSC over-currents and to supply required reactive power under a single line to ground system faults
Keywords :
PWM power convertors; power system control; power system faults; reactive power; static VAr compensators; voltage control; 100 MVAr; 150 MVAr; STATCOM; VAR support functionality; VSC; distribution system; emergency PWM; power system faults; reactive power; synchronous static compensator; transmission system; voltage regulation; voltage source converter; Automatic voltage control; Converters; Emergency power supplies; Power conversion; Power system dynamics; Power system faults; Power system simulation; Pulse width modulation; Reactive power; STATCOM;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Systems Conference and Exposition, 2006. PSCE '06. 2006 IEEE PES
Conference_Location :
Atlanta, GA
Print_ISBN :
1-4244-0177-1
Electronic_ISBN :
1-4244-0178-X
Type :
conf
DOI :
10.1109/PSCE.2006.296430
Filename :
4075869
Link To Document :
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