Rapid fault diagnosis method used for microgrid

Abstract

The invention discloses a rapid fault diagnosis method used for a microgrid, which adopts a mode of step-by-step diagnosis and comprises the following steps that firstly, primary diagnosis is carried out by utilizing the switch information of a network, i.e. newly added passive sub-networks are judged as fault regions and fault elements according to the difference of before and after topology analysis results of faults, and for simple faults, a unique fault region and fault element can be determined. For complicated faults, a plurality of suspected fault solutions can be possibly presented in the result of the primary diagnosis of the switch information. At this moment, a second-step diagnosis is entered, and the diagnosis is carried out by utilizing the protection information of the network. A new target function is established in protection information diagnosis by utilizing the protection information of the elements; the fault diagnosis problem of the microgrid is expressed as the 0-1 integer programming problem; a genetic algorithm and tabu search mixed strategy is introduced to solve the target function; and the fault elements are determined by the optimal solution. The invention can effectively improve the fault diagnosis efficiency, reduces the time of fault diagnosis and improves the fault diagnosis quality.

Description

technical field [0001] The invention relates to the fault diagnosis technology of the micro-grid, in particular how to automatically and quickly identify fault areas and fault components. Background technique [0002] In order to make up for the weakness of the large power grid when a large passive accident occurs and make full use of clean energy, the research on microgrid technology has attracted more and more attention from scholars at home and abroad. However, compared with the large power grid, due to the characteristics of the distributed power supply and transmission network in the microgrid, it is more prone to failure. In order to ensure the reliability and continuity of power supply, it is necessary to perform rapid fault diagnosis on the microgrid, and automatically identify faulty areas and faulty components, so as to improve the safe and stable operation of the microgrid and even the large power grid. [0003] Since the microgrid is a new type of power grid, th...

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Problems solved by technology

[0004] In the fault diagnosis of the general power grid, the traditional method is to use the power flow analysis method, which determines the fault area according to the system structure parameters of the real-time network topology and the power flow change. This method has a large amount of calculation and a slow diagnosis speed, so it is now widely used Attention is paid to the rapid fault diagnosis method based on artificial intelligence

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