Fault-tolerant location method of power quality disturbance source considering distributed power grid connection

Abstract

The invention provides a power quality disturbance source fault-tolerant positioning method considering distributed generator connection. The method comprises the steps of: defining related concepts of influence rules of DGs connection on disturbance direction determination, and providing two influence rules; defining a reliability concept of a PQM; representing trusting degree of PQM monitored data with a fuzzy characteristic; aimed at various kinds of influence factors, respectively configuring monitoring reliability and local reliability; establishing a new matrix particle swarm model, and configuring an evaluation function based on the two kinds of reliability; carrying out particle swarm searching and iteration, continuously updating individual extreme values and a global extreme value; and after satisfying convergence conditions, outputting the global extreme value, and determining a disturbance source positioning result according to the global extreme value.

Description

Technical field [0001] The invention relates to a method for automatically locating power quality disturbance sources with strong fault tolerance under the influence of distributed power grid connection, Gaussian noise, measurement error and other factors, and belongs to the fields of electrical engineering and power quality. Background technique [0002] The energy crisis and ecological environment problems in the world today make renewable energy the key to the sustainable development of human society. However, as more and more Distributed Generators (DGs) are connected to the distribution network, it will have a certain impact on the grid node voltage, power flow direction, etc., especially the existing disturbance source positioning algorithm will be invalid . However, the high dependence of the actual social and economic development on electric energy, as well as the continuous increase of precision electronic products and heavy loads, have caused the economic losses caused...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing disturbance source positioning technology that is easily affected by factors such as DGs grid connection, distance position, signal strength, Gaussian noise and monitoring errors, which lead to a significant decrease in positioning accuracy, and provide a A fault-tolerant positioning method for power quality disturbance sources based on the improved PSO algorithm, which can still have strong fault tolerance and high positioning accuracy when DGs are connected to the grid and some PQM disturbance directions are misjudged

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