Method for locating disturbance source of electrical power system

Abstract

The invention relates to a method for locating a disturbance source of an electrical power system. In the method, the disturbance is utilized to evaluate the fundamental positive-sequence impedance of a non-disturbance source side of the system, wherein the symbol of an resistance component in the impedance can reflect disturbance positions. At a dividing point M of a power-supply system side and a user side, the method is used to collect voltage and current waveforms containing the disturbance, and the power-supply system side is utilized as an upper stream and the user side is utilized as a lower stream; voltage changes and current changes generated by the disturbance at the M are respectively expressed as delta V and delta I, and the equivalent impedance of the voltage and the current is expressed as Ze; if the disturbance is generated at the power-supply system side, Ze is the equivalent impedance of the user side; if the disturbance is generated at the user side, Ze is a negative value of the equivalent impedance of the power-supply system side; and the symbol of a Ze resistive component is inspected to determine the direction of the disturbance source.

Description

technical field The invention relates to a method for locating a disturbance source in a power system. Background technique As big as system failure or heavy load switching, as small as changes in power loads, these events will cause disturbances to the power system. Disturbances can propagate from the disturbance source along the power grid to far away places, and then affect power users in a large area. Past research efforts have focused on the development of protocols and systems to diagnose disturbances by measuring them. Few works have been reported on perturbation source localization. With the restructuring of the power industry, power companies are increasingly inclined to quantify their responsibilities in terms of power quality, and disturbances are one of the most concerned power quality issues in power systems. Therefore, the study of the localization method of the disturbance source has attracted more and more attention in recent years. Although many scholars...

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Problems solved by technology

This is still an empirical approach and it is difficult to assess its applicability

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