Distance Protection During Asymmetrical Power Swings: Challenges and Solutions

It is commonly assumed that power swings are symmetrical phenomena that impose almost identical effects on the three-phase voltages and currents of the power system. However, there is another type of power swings which is asymmetrical and occurs mainly during single-pole tripping. In the nowadays he...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2018-12, Vol.33 (6), p.2736-2745
Main Authors: Hashemi, Sayyed Mohammad, Sanaye-Pasand, Majid
Format: Article
Language:English
Subjects:
Asymmetrical power swing
Asymmetry
distance protection
Fault detection
Impedance
Integrated circuits
Oscillators
Power system stability
Power transmission lines
Protective relaying
single-pole tripping
transmission line
Zero sequence current
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Summary:It is commonly assumed that power swings are symmetrical phenomena that impose almost identical effects on the three-phase voltages and currents of the power system. However, there is another type of power swings which is asymmetrical and occurs mainly during single-pole tripping. In the nowadays heavily loaded power systems, the likelihood of occurrence of this phenomenon is increased considerably. Although the effects of symmetrical power swings on distance protection are widely analyzed in the literature, asymmetrical power swings have been less studied so far. This paper focuses on this type of power swings and their effects on distance protection. Besides, two new techniques are proposed to detect faults during asymmetrical power swings and enhance performance of power swing blocking schemes. The first technique is based on the rate of change of zero sequence current, while the second one is based on the magnitudes of voltage and current in each phase, as well as their relative phase angle. The presented analyses and proposed methods are validated using two benchmark test systems and promising results are obtained.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2018.2816304