Study of Fault Location Algorithms for Two-Terminal/ Three-Terminal Multisection Compound Transmission Lines Based on Synchronized Phasor Measurements
Date Issued
2012
Date
2012
Author(s)
Lin, Tzu-Chiao
Abstract
In this dissertation, an innovative fault location algorithm for two- and three-terminal multisection compound transmission lines using synchronized phasor measurements (synchrophasors) provided by Global Positioning System (GPS) based Phasor Measurement Units (PMUs) or digital relays with embedded PMUs or by pre-fault and fault-on relay data synchronization algorithms, is proposed. This dissertation addresses the fault location issues for non-homogeneous line models, which cannot be solved exactly by the existing fault location methods proposed in open literature yet. The proposed algorithm is extended from a two-terminal fault location method for homogeneous lines to the algorithms for two- and three-terminal multisection compound lines which combine overhead lines with underground power cables. Specifically, faulty branch selector, faulty section selector, and fault locator for two- and three-terminal multisection compound lines are proposed, which can not only distinguish an internal fault of a compounded line from an external fault but also have the ability to locate a fault on an overhead line or an underground cable as well.
The proposed algorithm has a solid theoretical foundation and is direct and simple in terms of computational complexity since neither fault type selections nor iterative operations are required. Both extensive simulations and field evaluations have been presented to demonstrate the effectiveness of the proposed algorithm. The proposed algorithm has already been implemented in the Taiwan power system since the year 2008. So far the algorithm yields excellent performance and robustness compared to fault location methods of installed digital relays in Taiwan.
Subjects
fault location
345 kV and 161 kV transmission lines
two- and three-terminal multisection compound lines
synchrophasors
digital relays
intelligent electronic devices (IEDs)
phasor measurement units (PMUs)
Taiwan power system
Type
thesis
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