基于综合阻抗比较原理的广域继电保护算法

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Abstract This paper extends integrated impedance protection to multiple terminal transmission system in order to realize wide area protection, and discusses integrated impedance definitions and calculation analysis. The integrated impedance reflects line capacitive reactance when external fault occurs, and its magnitude reaches several kilo-ohms and its impedance angle is in -90°or so. In contrast, the amplitude of integrated impedance is no more than 600Ω and impedance angle is about -ε ～90° when internal fault occurs. Then, the three-step protection scheme is also presented based on the different situation analyses caused by wide-area protection differential current activated, which always realizes transmission system reliable protection when internal fault, measurement errors or substation DC disappear occur. Simulation tests based on IEEE 10-machine and 39-bus system illustrate that this algorithm could be set conveniently and could select phase naturally, the fault estimation results are immune to distributed capacitive current and grounding resistance, which has helpful applied prospect in wide area protection domain.

Key words： Wide area relaying protection integrated impedance protection algorithm protection zone grounding resistance

Received: 19 July 2010 Published: 20 March 2014

PACS:

TM773

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	Articles by authors
	Li Zhenxing
	Yin Xianggen
	Zhang Zhe
	He Zhiqing

Cite this article:

Li Zhenxing,Yin Xianggen,Zhang Zhe等. A Study of Wide-Area Protection Algorithm Based on Integrated Impedance Comparison[J]. Transactions of China Electrotechnical Society, 2012, 27(8): 179-186.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2012/V27/I8/179

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