Title :
New microprocessor based relay to monitor and protect power systems against sub-harmonics
Author :
Narendra, K. ; Fedirchuk, D. ; Midence, R. ; Zhang, N. ; Mulawarman, A. ; Mysore, P. ; Sood, V.
Author_Institution :
ERLPhase Power Technol. Ltd., Winnipeg, MB, Canada
Abstract :
A routine switching event in the Xcel Energy transmission system resulted in sustained oscillations between wind generators and the system connected through a series compensated line. This event led to the development of a new microprocessor based sub-harmonic protection relay that could detect such conditions and take preventative measures. This paper discusses a new technique to detect sub-harmonics in the range of 5-25 Hz using current and voltage level detectors, sub-harmonic calculations of individual sub-harmonics and total sub-harmonic distortion factor (TSHD) to generate an alarm and/or trip to isolate the faulty system. Various test cases are presented to illustrate the effectiveness of the new technique.
Keywords :
power generation faults; power system measurement; power system protection; power transmission faults; wind power; Xcel energy transmission; compensated line; current level detectors; faulty system; frequency 5 Hz to 25 Hz; microprocessor relay; power system monitoring; power system protection; routine switching event; sub-harmonic protection relay; sustained oscillations; total sub-harmonic distortion factor; voltage level detectors; wind generators; Detectors; Generators; Harmonic analysis; Oscillators; Power system harmonics; Relays; Recursive Fourier Transform; Series-compensated wind farms; sub-harmonic oscillations; sub-harmonic protection; transmission line protection;
Conference_Titel :
Electrical Power and Energy Conference (EPEC), 2011 IEEE
Conference_Location :
Winnipeg, MB
Print_ISBN :
978-1-4577-0405-5
DOI :
10.1109/EPEC.2011.6070241