PQDS positioning method based on evidence theory

A technology of power quality disturbance and power quality monitoring, applied in the direction of electric digital data processing, special data processing application, fault location, etc.

Active Publication Date: 2015-09-09
STATE GRID ZHEJIANG HANGZHOU XIAOSHAN POWER SUPPLY CO +1
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Problems solved by technology

[0004] The present invention overcomes the problem that the accuracy of the existing PQDS positioning algorithm is heavily dependent on the reliability of the PQM disturbance direction determination results of each monitoring point in the NPQMS and the completeness of the direction determination information, and comprehensively considers the strength of the disturbance signal, the characteristics of the disturbance current, and the access of distributed power sources. As well as the influence of factors such as state estimation errors on the reliability of the determination of the disturbance direction, a PQDS automatic positioning method based on the evidence fusion theory is provided to realize that when some monitoring information in NPQMS is missing, wrong or the result of the determination of the disturbance direction is not ideal, Accurate positioning of PQDS can still be achieved, and the credibility of its positioning results can be evaluated

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  • PQDS positioning method based on evidence theory
  • PQDS positioning method based on evidence theory
  • PQDS positioning method based on evidence theory

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Embodiment Construction

[0051] The present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto. The overall block diagram of the PQDS positioning scheme based on the evidence fusion theory in the embodiment is as attached figure 1 shown, including the following steps:

[0052] 1. Determine the system coverage matrix A L×N and direction decision matrix B v,N×1 . In a distribution network containing L line segments and N PQMs, the coverage matrix A used to represent the positional relationship between all lines and PQMs can be constructed separately L×N , and the direction matrix B used to represent the disturbance direction determination results of all monitoring points PQM based on two different disturbance direction criteria, disturbance power and disturbance energy, when a disturbance event occurs in a certain position in the system v,N×1 . A L×N and B v,N×1 Eac...

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Abstract

The invention relates to a PQDS (Power Quality Disturbance Source) positioning method based on an evidence fusion theory. The method comprises the following steps of: determining a system covering matrix A<L*N> and a direction judging matrix B<v, N*1> realized according to two kinds of judging evidences including disturbance power and disturbance energy; building a reliability function of each influence factor of a characterization disturbance direction judging result; carrying out fusion processing on uncertainty disturbance direction judging information obtained by two kinds of judging evidences on the basis of D-S evidences; carrying out PQDS positioning decision making on the basis of the fused disturbance direction judging matrix and a matrix algorithm; and carrying out PQDS positioning result credibility evaluation on the basis of coincidence indexes among a plurality of evidence sources.

Description

technical field [0001] The invention relates to a method for locating a power quality disturbance source based on evidence theory and taking monitoring reliability into account, belonging to the fields of electrical engineering and power quality. Background technique [0002] In recent years, with the rapid increase of sensitive equipment in the power grid and the continuous advancement of the power marketization process, the economic losses caused by power quality disturbances have increased rapidly, and people's demands for determination of responsibility have become increasingly strong. Power Quality Disturbance Source (PQDS) location refers to when a power quality disturbance event occurs in the target grid area, the power quality monitoring device (Power Quality Monitor, PQM) arranged in the system and the power quality monitoring center will locate the The disturbance signal is collected, calculated, analyzed and processed, and then the intelligent diagnosis of the exa...

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Application Information

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IPC IPC(8): G06F17/50G01R31/08
CPCY02E60/00
Inventor 翁国庆王强黄飞腾张有兵谢路耀
Owner STATE GRID ZHEJIANG HANGZHOU XIAOSHAN POWER SUPPLY CO
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