Power grid harmonic source positioning method based on wide-area monitoring

A positioning method and harmonic source technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., to optimize the operation process, improve stability, and ensure the effect of estimation accuracy

Inactive Publication Date: 2019-04-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the existence of synchronous measurement technology, there are many differences from traditional state estimation

Method used

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  • Power grid harmonic source positioning method based on wide-area monitoring
  • Power grid harmonic source positioning method based on wide-area monitoring
  • Power grid harmonic source positioning method based on wide-area monitoring

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Experimental program
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Embodiment Construction

[0063] Below in conjunction with the drawings, preferred embodiments of the present invention are given and described in detail.

[0064] Build in PSCAD such as figure 1 model shown. This is a simulated 12.5kV distribution network system, in which the 110kV side is the power generation end, and the transformer connected to the distribution network through the neutral point and grounded by the arc suppression coil transmits electric energy to the distribution network, and then transmits it to the 380V user end . The arrows in the figure indicate the load branches, and the red marks indicate the line synchronous measurement terminals. The number and location of the configurations depend on the measurement requirements. Connect the harmonic current source to node 17. A delay switch is installed on the path connecting the harmonic injection current branch and the busbar to simulate the dynamic process of the connection sequence.

[0065] Before the harmonic sources change over...

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Abstract

The invention discloses a power grid harmonic source positioning algorithm based on wide-area monitoring. The positioning algorithm comprises the following steps: applying power distribution line measurement to harmonic state estimation and harmonic source positioning, taking the voltage current and like state variables collected by a wide-area monitoring system as the basis, proposing a specificoptimization algorithm according to the weighted least square method, and realizing the power grid harmonic source positioning by utilizing the phasor difference method. The harmonic source positioning based on the wide-area measurement system sufficiently plays the wide-area low-cost characteristics, the operation process is optimized, the estimation precision is guaranteed, the full-network harmonic voltage state is obtained, and the harmonic source detection sensitivity and the positioning accuracy are much better than the traditional detection. And the method disclosed by the invention hasimportant significance for the analysis processing of the power grid harmonic source.

Description

technical field [0001] The invention relates to the location of the harmonic source of the power grid, in particular to a method for locating the harmonic source of the power grid based on a wide-area monitoring system. Background technique [0002] Harmonics are the main pollution source of the power system and one of the major public hazards of the power system. As the last link in the power system and the last link connected to users, the distribution network is directly connected to distributed power sources or users, and connected to industrial production. It is closely related to daily life, but the distribution network is often disturbed by harmonics, which greatly affects the power supply quality and reliability of the entire distribution network. Therefore, the accurate positioning of the harmonic source in the distribution network is the key to maintaining the stable operation of the power system and ensuring the quality of power. [0003] The number of distributi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 刘亚东李子龙罗林根
Owner SHANGHAI JIAO TONG UNIV
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