This paper proposes a synchrophasors-assisted intelligent relaying scheme for transmission lines compensated by Unified Power Flow Controller (UPFC). The algorithm uses a new relaying signal termed as imaginary part of integrated impedance (IPII). The synchronized phasor measurements at both ends of the transmission line are used to extract voltage and current phasors from instantaneous voltage and current signals. The voltage and current phasors are utilized to derive IPII of each phase. Further, IPII of each phase is used as input to a data-mining model termed as decision tree (DT) which provides the final relaying decision. The proposed algorithm is validated on real-time digital simulator (RTDS) platform, and the results obtained indicate that the proposed scheme is both dependable and secure in protecting transmission system compensated by UPFC. © 2015 Walter de Gruyter GmbH.

Manas Kumar Jena

Department of Electrical Engineering

S.R. Samantaray

Fulltext

Indian Institute of Technology Palakkad&nbsp;(IIT Palakkad or IIT PKD) is a public autonomous&nbsp;engineering&nbsp;and&nbsp;research&nbsp;institute located in&nbsp;Palakkad,&nbsp;Kerala. It was&nbsp;one of the five new&nbsp;IITs&nbsp;proposed in the&nbsp;2014 Union budget of India. The campus was inaugurated on 3 August 2015. The institute has 94 faculty, 978 students, and 63 non-teaching staffs.

IT Palakkad currently offers four-year Bachelor of Technology (B.Tech) and two years MS programmes in 8 different engineering disciplines including&nbsp;Computer Science, Electrical, Mechanical, Civil among others.

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IIT Palakkad

International Journal of Emerging Electric Power Systems

Summary The paper presents integrated impedance-based intelligent relaying for thyristor-controlled series capacitor-compensated transmission lines on Real Time Digital Simulator platform. Integrated impedance is defined as the ratio of sum of the voltage phasors across two ends of the transmission line to the sum of the current phasors through two ends of the same transmission line. The imaginary part of integrated impedance of the transmission line is used as input to a data-mining model known as decision tree that determines whether the fault is within the protected zone or not. Critical issues such as power swing and fault during power swing are also included during validation of the relay on Real time digital simulator platform. The test results obtained indicate that the proposed integrated impedance-based intelligent relaying is highly dependable and secure for protection of extra high voltage transmission lines including thyristor-controlled series capacitor. © 2014 John Wiley & Sons, Ltd.

International Transactions on Electrical Energy Systems

Real time digital simulator implementation of data-mining-based integrated impedance relay for compensated lines

The paper presents a decision tree (DT) induced fuzzy rule-based intelligent differential relaying scheme for transmission lines including unified power flow controller (UPFC) and wind-farms. The conventional distance relaying scheme fails miserably in protecting transmission lines including flexible AC transmission systems controllers such as UPFC and further, the protection issues become more challenging when wind-farm is integrated. The proposed protection scheme extracts features from the instantaneous voltage and current signals from both ends of the transmission line using discrete Fourier transform based pre-processor and computes corresponding differential features. The differential features are used to build the fault classification tree using a data-mining algorithm known as DT. Further, the fuzzy membership functions are drawn using the DT thresholds and the corresponding fuzzy rule-base is developed for final relaying decision. The proposed technique has been extensively tested (in MATLAB environment) for single circuit and double circuit transmission lines including UPFC and wind-farms with wide variations in operating conditions. The test results indicate that the proposed DTinduced fuzzy rule-based relaying scheme is highly reliable and robust for protection of complex transmission line including UPFC and wind-farm. © The Institution of Engineering and Technology 2014.

IET Generation, Transmission and Distribution

Decision tree-induced fuzzy rule-based differential relaying for transmission line including unified power flow controller and wind-farms

International Journal of Electrical Power & Energy Systems

Digital distance protection of transmission lines in the presence of SSSC

IEEE Systems Journal

Synchrophasor Assisted Adaptive Reach Setting of Distance Relays in Presence of UPFC

IEEE Transactions on Power Delivery

A Decision Tree-Based Method for Fault Classification in Double-Circuit Transmission Lines

Synchrophasors-assisted IPII-based intelligent relaying for transmission lines including UPFC

Journal	Data powered by TypesetInternational Journal of Emerging Electric Power Systems
Publisher	Data powered by TypesetWalter de Gruyter GmbH
ISSN	21945756