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摘要
Based on the wide application of wide-area measurement system and synchronous digital hierarchy, wide-area relaying protection is becoming hot topic which can help to solve the problems about the complicated setting and coordination of traditional backup protection and cascading overload trip caused by power flow transferring. Based on sectional and centralized-distributed wide-area relaying protection system architecture, a novel wide-area backup relaying protection algorithm is proposed in this paper. Combined with the distribution characteristics of line's sequence voltage and current when power system fault occurs, the algorithm can monitor the starting signal of each bus' sequence voltage, then select out a suspected faulty line by collating of bus's enable sequence voltage. At the same time, the criterion of identifying fault is formed with the proportion of sequence current phase and current amplitude in both ends of suspected fault line. When fault occurs in the range of the line, current's phase and amplitude are equal in both ends of the line. When fault occurs outside the range of the line, current's phase and amplitude are opposite in both ends of the line. The algorithm can decrease system's communication quantity and calculating quantity by only uploading the information of suspected faulty line. Meanwhile, the algorithm can eliminate the effects of line's distributed capacitance by using line model with distributed parameters. The algorithm could be set conveniently and could be used in the complexity operating condition such as grounding with high impedance, operating with two phases, translating fault and power transferring. Based on IEEE 10-machine and 39-bus system, Simulation results prove the effectiveness and adaptability of the method.
- 出版日期2018-4
- 单位三峡大学
