Voltage sag monitoring point optimal configuration method based on minimum amplitude search

Abstract

The invention discloses a voltage sag monitoring point optimal configuration method based on minimum amplitude search. The method comprises the following steps: collecting power grid parameters, regarding a fault point as a virtual node, and calculating voltage, mutual impedance and self-impedance before the fault of the virtual node, to form a system impedance matrix containing the virtual node;searching the minimum voltage sag amplitude of each node when any line has a short-circuit fault and the fault position changes on the line by using a golden section method, and traversing the whole network, to form a minimum voltage sag amplitude matrix; comparing the minimum voltage sag amplitude with a voltage threshold, to form voltage sag observable domain matrixes under different fault types, and calculating an observable domain matrix union under each fault type, to obtain a worst voltage sag observable domain matrix; and obtaining the optimal configuration method of the voltage sag monitoring point by taking the minimum number of the monitoring nodes as a target and taking the full observability of the whole network voltage sag as a constraint. The voltage sag monitoring blind areais eliminated, and the calculation efficiency is improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of power quality monitoring and analysis, in particular to a method for optimal configuration of voltage sag monitoring points based on minimum amplitude search. Background technique [0002] Voltage sag is one of the most concerned problems in power quality. The International Institute of Electrical and Electronics Engineers (IEEE) defines it as the rapid drop of the root mean square value of the supply voltage to 90% to 10% of the rated value for a duration of 0.5 Power quality events with cycles up to 30 cycles. With the large investment of sensitive equipment in the power system, the economic loss of production caused by voltage sag is becoming more and more serious. If a fully observable monitoring system for voltage sags in the entire network can be established, the occurrence of voltage sags in the system can be effectively monitored in real time, and preventive measures can be ...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method for optimal configuration of voltage sag monitoring points based on minimum amplitude search, searches for the minimum voltage sag amplitude of each node through the golden section method, optimizes configuration of sag monitoring points, and eliminates the existing voltage sag The optimal configuration method of drop monitoring points has the problems of monitoring blind areas and low calculation efficiency, and realizes effective monitoring of voltage sags in the entire network

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