期刊
IET SCIENCE MEASUREMENT & TECHNOLOGY
卷 11, 期 6, 页码 703-712出版社
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-smt.2016.0458
关键词
power transmission lines; power transmission faults; power transmission protection; load flow control; power transmission control; fault simulation; synchronisation; backup protection scheme; transmission line; UPFC; compensation; unified power flow controller; power differential protection algorithm; distance protection; load encroachment; high impedance fault simulation; HIF simulation; power swing; three machines four bus transmission system; MATLAB software; synchronisation delay; pre-fault power flow angle; CCVT transient error; CT transient error; voltage 500 kV
This study presents a backup protection scheme for transmission line compensated with unified power flow controller (UPFC) using power differential protection algorithm. In this scheme, power differential feature is evaluated from the apparent power flow in each phase at the local and remote bus to discriminate between the fault and normal situation. The proposed protection algorithm can be integrated with the conventional distance protection to supervise its operation during stressed conditions. Extensive fault simulation studies have been performed for different types of fault with several conditions and critical dynamic situations/issues such as load encroachment, power swing and high impedance fault (HIF). A 500kV three machines four bus transmission system with UPFC has been used to validate the performance of the proposed scheme using MATLAB software. The test results depict that the proposed scheme is robust against HIF, power swing and load encroachment. It is not affected by the variation in pre-fault power flow angle and synchronisation delay. The proposed scheme has also been tested for current transformer (CT) and coupling capacitor voltage transformer (CCVT) transient error, which brings out the superiority of the scheme.
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