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摘要
The performance of conventional travelling wave protection is liable to be influenced by the high frequency transient quantities, which can reduce the protection reliability. To solve this problem, this paper proposed a high-speed fault-component based directional protection algorithm. Theoretical analysis result shows that during a period of time after the fault, the directional polarities obtained from superimposed voltages and currents at the relay point can describe the fault direction after the high frequency components being filtered out. For forward faults, the supervised voltage has opposite polarity compared with that of the current;for backward faults, they have same polarities. Based on this, a novel phase-sequence transformation matrix was constructed to identify faults for three-phase systems. Sequence 1 and 2 quantities transformed by using this matrix are suitable for all fault types. The algorithm can also been applied to series-compensated or parallel-compensated transmission lines and its performance will not be influenced by operation states of shunt reactors of parallel-compensated transmission lines. Simulation results show that the scheme can quickly and reliably identify internal and external faults, and the algorithm is immune to fault resistances and fault inception angles. Its performance is also not affected by the current and voltage inversion phenomena of the series-compensated transmission lines. The scheme is feasible for actual application.
- 出版日期2014-10-5
- 单位广西大学
