Method for positioning disturbance source of power system based on high-order harmonic equivalent impedance property

A disturbance source location, equivalent impedance technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, etc., can solve problems such as difficulty in evaluating the scope of application

Inactive Publication Date: 2011-05-04
DONGYING POWER SUPPLY COMPANY STATE GRID SHANDONG ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • Method for positioning disturbance source of power system based on high-order harmonic equivalent impedance property
  • Method for positioning disturbance source of power system based on high-order harmonic equivalent impedance property
  • Method for positioning disturbance source of power system based on high-order harmonic equivalent impedance property

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] The perturbation source localization problem is available figure 1 shown in the explanatory diagram to describe. The disturbance source monitor captures the voltage and current waveforms containing disturbance at point M to judge whether the disturbance is from upstream or downstream. During specific implementation, point M is located at the demarcation point between the power supply system and the user.

[0020] The basic steps of the present invention are as follows:

[0021] 1) Once a disturbance is measured at the detection point, calculate the equivalent impedance Z e :

[0022] Z e = ΔV ΔI = V during - V I during ...

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Abstract

The invention relates to a method for positioning a disturbance source of a power system based on high-order harmonic equivalent impedance property. A monitor of the disturbance source is arranged at a demarcation point of a power supply system and a user side, and the monitor of the disturbance source can catch voltage and current waveform containing disturbance at an M point so as to judge the disturbance is from upper stream or lower stream, wherein the power supply system side is arranged at the upper stream, and the user side is arranged at the lower stream; once the occurrence of one disturbance is measured at the detection point, the equivalent impedance Ze is calculated, wherein (Vpre, Ipre) and (Vduring, Iduring) are five-order harmonic negative-sequence voltage and current measured at the measuring point M before and during the occurrence of the disturbance; if the Ze falls in a first quadrant of an impedance plane diagram, the disturbance source is determined to be positioned on the power supply system side; and if the Ze falls in a third quadrant of the impedance plane diagram, the disturbance source is determined to be positioned on the user side.

Description

technical field [0001] The invention relates to a method for locating a disturbance source of a power system based on the equivalent impedance characteristic of a high-order harmonic. Background technique [0002] 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 disturb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 薄成哲徐金辉王青任尚伟李仁辉
Owner DONGYING POWER SUPPLY COMPANY STATE GRID SHANDONG ELECTRIC POWER
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