Method and device for identifying voltage fragile area of power distribution network

Abstract

The invention relates to a method and a device for identifying a voltage fragile area of a power distribution network. The method comprises the following steps of providing a bus sag identification vector and a line voltage sag correlation vector, quickly judging which lines of the power distribution network have critical points, and providing a method for determining the number of the critical points on the lines based on the bus sag identification vector and the line voltage sag correlation vector so as to obtain higher calculation efficiency; on the basis of accurately obtaining a sensitiveload voltage sag domain, providing the concept of bus voltage sag influence degree and line voltage sag influence degree, and identifying the fragile area of the power distribution network by considering multiple factors such as distribution probability of the fault types of the power distribution network, the fault probability of the lines and the buses, the sensitive load tolerance characteristic and the like.

Description

technical field [0001] The present invention relates to the technical field of distribution network protection and control, and more specifically, to a method and device for identifying voltage vulnerable regions of a distribution network. Background technique [0002] As the most important power quality problem, voltage sag is the main factor that seriously affects the reliability of distribution network power supply, especially causing huge economic losses and waste of resources to modern park manufacturing enterprises. Statistics from the Lawrence Berkeley National Laboratory in the United States show that the economic losses caused by power interruptions to American power users are close to 80 billion U.S. dollars every year. The survey results of the EU Leonardo Power Quality Working Group show that the annual economic losses caused by voltage sags and power interruptions in the 25 EU member states are as high as 93 billion euros. Voltage sag has brought serious econom...

AI Technical Summary

Problems solved by technology

The fault point method can be applied to radial distribution network and mesh distribution network at the same time, but this method needs to simulate a large number of fault points to ensure the accuracy of the load voltage sag domain solution, so the disadvantage of this method is that the load voltage sag The solution of the domain brings a huge workload, especially when the number of distribution network nodes increases, the applicability of this method is lower

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