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Method for distinguishing multiple harmonic sources

An identification method and multi-harmonic source technology, applied in the field of multi-harmonic source identification

Active Publication Date: 2012-01-18
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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Problems solved by technology

In a power distribution system with multiple harmonic sources, when a power quality problem caused by harmonics occurs, how to accurately identify the "problem" harmonic source and determine the harmonic responsibility of each harmonic source, and find out the It is a technical problem that has not been effectively solved in the field of harmonic detection to deal with the harmonic source that has the greatest impact on quality problems and to control it.

Method used

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  • Method for distinguishing multiple harmonic sources
  • Method for distinguishing multiple harmonic sources
  • Method for distinguishing multiple harmonic sources

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with accompanying drawings and examples.

[0045] The steps of the present invention are:

[0046] (1) Define the harmonic impact index

[0047] Assuming that the harmonic problem at node X in the system is caused by the joint action of n "suspicious harmonic source loads", for the hth harmonic voltage, the harmonic current I of n "suspicious harmonic source loads" nodes is measured h1 , I h2 , I h3 ......I hn ;h harmonic voltage at node X According to the harmonic impedance of the system [Z h ] calculation; divide the hth harmonic voltage at point X into two parts: one part is generated by the harmonic source load i The other part is background harmonics generated by other harmonic source loads

[0048]

[0049] The hth harmonic voltage generated by harmonic source load i at point X h total harmonic voltage to point X contribution through exist The projection representation on (s...

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Abstract

The invention relates to a novel method for distinguishing multiple harmonic sources, which can be used for providing theoretical foundation for positioning a disturbance source in a multiple harmonic source system, managing harmonic waves, rewarding or punishing the harmonic waves and the like and has a broad application prospect and favorable social and economic benefits. The method comprises the following steps of: (1) defining a harmonic influence index; (2) solving the harmonic influence index; (3) acquiring and pre-processing data; and (4) selecting and analyzing the data.

Description

technical field [0001] The invention relates to a new multi-harmonic source identification method. Background technique [0002] With the rapid development of science and technology, there are new trends in the composition of modern power grids and loads. A large number of harmonic sources inject high-order harmonic currents into the grid and cause voltage distortion, which has a great impact on the safety and economic operation of the power system. Harmonics generated by non-linear loads will not only reduce the safety of power supply equipment itself, but also seriously affect the economic operation of the power grid and the interests of users. In order to effectively control the harmonics in the power grid, a "reward and punishment scheme" is proposed internationally. The basic idea is: the system and users trade normally within the rated range. If the system cannot guarantee the quality of power supply, the user should be compensated; if If the user's pollution index d...

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Application Information

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IPC IPC(8): G01R31/00G01R23/16
Inventor 臧宏志孙媛媛杨永军俞晓东李广磊尹志明
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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