Research of grounding grid fault diagnosis based on differential evolution algorithm

摘要

Grounding grid in the maintenance of power plants and substations safe and reliable operation, guarantee the safety of operators and electrical equipment play an important role. However, due to grounding grid long buried underground, by the electrochemical corrosion in soil environment and the power grid equipment running discharge caused by corrosion, make the conductor that constitute grounding grid severely damaged. The grounding grid that is severely damaged will affects the safety of the normal power supply. Correctly grasping the running status of grounding network, finding hidden danger in time and taking corresponding measures for grounding grid conductor corrosion diagnosis has great significance. Because actual grounding grid only have limited accessible nodes by changing position and every incentive several times measuring, make the accessible nodes can full use, the fault diagnosis equation can be obtained by this method. Due to establishing the fault diagnosis equation is usually an under-determined equation, therefore it is necessary to further study the new diagnosis method to get the optimal solution, thus improve the diagnostic accuracy. This paper adopts a new algorithm that differential evolution algorithm. Finally, in this paper, an instance proved the feasibility of the algorithm.