Quantum-genetic-algorithm-based fault diagnosis method for medium-voltage distribution network

Abstract

The invention relates to a quantum-genetic-algorithm-based fault diagnosis method for a medium-voltage distribution network. The method is characterized in that the method comprises the following steps that: step one, an improved medium-voltage distribution network fault diagnosis model is established by employing actual and expected values of element movement and combining the circuit breaker failure protection and the protection state of automatic opening and closing of the circuit breaker; and step two, a quantum-genetic-algorithm-based improved medium-voltage distribution network fault diagnosis model is solved to carryout fault diagnosis on the medium-voltage distribution network. According to the invention, the distribution network fault diagnosis model is established by analyzing the element type and the protection configuration situation of the distribution system; protection and the movement situation of and circuit breaker after a fault scene are simulated; and then the fault model is solved by using the quantum genetic algorithm. Therefore, functions that a fault element can be localized accurately after fault occurrence at a distribution network and the fault of the distribution network can be diagnosed rapidly and comprehensively can be realized.

Description

technical field [0001] The invention relates to the technical field of urban distribution network planning and fault diagnosis, in particular to a method for fault diagnosis of a medium-voltage distribution network based on a quantum genetic algorithm. Background technique [0002] As an important link in the production, transmission and use of electric energy, the power distribution system is the key link between the actual user demand side and the power generation and transmission system. Therefore, how to effectively and reasonably locate and diagnose the fault after the fault occurs in the distribution network is a key part of the current evaluation and development of the urban power grid. Considering that in the distribution network, the harsh environment of the communication information device and the inconsistency in the development of distribution automation in different regions have caused a large number of uncertain factors in the fault information of the distribut...

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Problems solved by technology

The above method provides a good research idea for the fault diagnosis of power system, but there are still the following limitations: First, it fails to consider the diagnostic accuracy of protection or switch refusal to operate, malfunction and information distortion under the condition of distribution network fault; Second, the timing of component actions in the power system under fault conditions has not been fully considered

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