Adaptive phasor estimation algorithm to enhance numerical distance protection

作者：Mahari Arash^*; Sanaye Pasand Majid; Hashemi Sayyed Mohammad

来源：IET Generation Transmission & Distribution, 2017, 11(5): 1170-1178.

DOI：10.1049/iet-gtd.2016.0911

• power system security
• relay protection
• power system reliability
• electric impedance measurement
• potential transformers
• transients
• estimation theory
• power system measurement
• adaptive phasor estimation algorithm
• numerical distance protection
• signal condition assessment
• DC component
• coupling capacitor voltage transformer transients
• distance relay impedance measurement
• DC removal method
• DC value estimation method
• current phasor estimation
• voltage signal condition

This study presents an adaptive phasor estimation approach for fast numerical distance protection. The proposed method is based on signal condition assessment and choosing the proper phasor estimation method. Effects of errors caused by decaying DC component and coupling capacitor voltage transformer transients, as the main problems for distance relay impedance measurement procedure, are alleviated using the proposed adaptive method. Meanwhile, a new short window DC removal method is introduced. Thanks to the fast DC value estimation method, a short window phasor estimation method is utilised for current phasor estimation. Using the proper phasor estimation method based on voltage and current signal conditions results in more accuracy, fast decision making procedure and consequently a more reliable protection scheme. To verify the performance of the proposed method, numerous simulation studies are carried out. The results assert that the proposed adaptive method not only accelerates the relay operation, but also improves the relay accuracy which enhances numerical distance protection from security and dependability viewpoints.

• 出版日期2017-3-30