A thyristor flexible control strategy based on zero sequence current update control is proposed to solve the problem of flexible arc suppression of single-phase faults in distribution networks. Based on the innovation graph theory, the zero sequence current innovation characteristics before and after feeder fault are analyzed, and the zero-sequence current innovation line selection method for single-phase fault of distribution network is proposed. A master-slave arc suppression coil compensation device is improved, and a control strategy of arc suppression coil is proposed with the amplitude of zero-sequence current innovation as the trigger condition. ADPSS simulation program is used to verify the effectiveness of the method, which provides a theoretical basis for the flexible arc suppression method of single-phase ground fault in distribution network.
Due to the large distributed capacitance of EHV transmission line, its relay protection scheme is obviously different from the traditional method, and the existing method cannot realize the whole line speed. This paper analyzes the basic method of zero sequence current differential protection, discusses the influence of capacitor current on the current protection of EHV transmission line, and puts forward the zero sequence current innovation protection method. When the zero sequence current innovation exceeds the threshold, the starting criterion locates the fault line. This method is not affected by fault location and fault type, and improves the reliability of protection algorithm. The feasibility of the protection algorithm is verified by PSCAD simulation.
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