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.
|Original language||English (US)|
|Title of host publication||2011 IEEE Electrical Power and Energy Conference, EPEC 2011|
|Number of pages||6|
|State||Published - 2011|
|Event||2011 IEEE Electrical Power and Energy Conference, EPEC 2011 - Winnipeg, MB, Canada|
Duration: Oct 3 2011 → Oct 5 2011
|Name||2011 IEEE Electrical Power and Energy Conference, EPEC 2011|
|Conference||2011 IEEE Electrical Power and Energy Conference, EPEC 2011|
|Period||10/3/11 → 10/5/11|
Copyright 2011 Elsevier B.V., All rights reserved.
- Recursive Fourier Transform
- Series-compensated wind farms
- sub-harmonic oscillations
- sub-harmonic protection
- transmission line protection