Adaptive three-phase reclosing method and system based on current characteristics of shunt reactor

Abstract

The technical schemes of the invention include a shunt reactor current characteristic based adaptive three-phase reclosing method and system. The method and system are used for realizing the followingsteps: obtaining a current-mode component and voltage-mode component corresponding to three-phase current data according to the three-phase current data and voltage characteristic data through calculation; analyzing the consistency and correlation of the three-phase current data, the current-mode component and the voltage-mode component, and obtaining consistency and correlation determination fault types through analysis; and automatically executing corresponding three-phase reclosing commands according to the determined fault types and time domains where the faults are located, the time domains including before and after arc extinction. The beneficial effects of the method and system are that negative correlation characteristics under permanent failures can be detected by utilizing correlation coefficient values so that fault properties can be identified without using spectrum analysis and frequency measurement algorithms to calculate the correlation parameters of related signals andbeing affected by fault location and transition resistance; and the method is small in calculated amount and does not need to modify criterions according to line parameters, so that the method can have adaptivity.

Description

technical field [0001] The invention relates to an adaptive three-phase reclosing method and system based on the current characteristics of a shunt reactor, and belongs to the field of computer electric power. Background technique [0002] Most of the faults of ultra-high voltage transmission lines are transient faults. The automatic reclosing technology can quickly restore the power supply and improve the reliability of the continuous power supply of the power system. However, the traditional automatic reclosing switch uses a fixed time interval reclosing scheme. When reclosing is caused by a permanent fault, it will bring more serious secondary impacts to the power system and equipment components. In view of this, researchers have proposed adaptive reclosing technology, that is, after the circuit breaker trips, the fault nature is first identified, and the reclosing command is issued only when it is judged to be an instantaneous fault and the secondary arc has been extingu...

AI Technical Summary

Problems solved by technology

But existing techniques usually require spectrum analysis and are computationally intensive

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