Method and system for delay judgment of fault direction of bus circuit

Abstract

The invention provides a method and system for delay judgment of the fault direction of a bus circuit, a computer device and a computer readable storage medium. The method comprises the steps that thephase voltage and phase current of each phase in the alternating-current bus circuit of a high-voltage direct-current transmission inverter side are obtained, and the sequence voltage, sequence current and three-phase power of the bus circuit are calculated; whether a fault exists in the bus circuit or not is judged according to the phase voltage and the sequence voltage, and a corresponding fault signal is generated if the fault exists; after the fault signal is generated, the fault component of the sequence voltage, the fault component of the sequence current and the direction of the three-phase power are obtained through delay; according to the fault signal, the fault component of the sequence voltage, the fault component of the sequence current and the direction of the three-phase power, whether the fault happens to the forward direction of the bus circuit or the reverse direction of the bus circuit is judged, the influence of transient power reversing is avoided, and then the situation that a protection system is mistakenly operated is avoided.

Description

technical field [0001] The present invention relates to the field of direct current transmission, in particular to a method for judging the time delay of the fault direction of a bus circuit, a system for judging the time delay of the fault direction of a bus circuit, a computer device, and a computer-readable storage medium . Background technique [0002] At present, in related technologies, high-voltage and ultra-high-voltage AC lines are generally equipped with longitudinal protection. When an AC fault occurs in the receiving-end power grid, the DC control system will respond quickly. At this time, the disturbance caused by the AC fault of the receiving-end power grid and The disturbance caused by the fast response of the DC control system may have the alternation of the dominant disturbance, that is, the disturbance caused by the fast response of the DC control system may become the dominant disturbance. Take the forward DC system disturbance caused by the backside AC s...

AI Technical Summary

Problems solved by technology

Take the forward DC system disturbance caused by the backside AC system fault of the fault direction judgment equipment as an example. The backside fault dominates the fault, and it should be judged as a reverse fault at this time. When the DC control system responds quickly, causing the DC system When the disturbance is more serious than the backside fault, it will be judged as a forward fault, that is, a transient power reversal occurs, and the protection system in the corresponding direction will malfunction

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