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A Online Diagnosis Method of Transformer Status Based on pmu Data

A diagnostic method and transformer technology, applied in data processing applications, instruments, and measurement of electrical variables, can solve problems such as difficult to accurately model, random constraints, and complex influencing factors, so as to reduce diagnostic costs, achieve accuracy, and improve Intelligent effect

Active Publication Date: 2021-12-28
辽宁正泰智能电气有限公司
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Problems solved by technology

[0006] The present invention aims at the defects existing in the prior art, aiming at problems such as complex influencing factors, random constraints, and difficulty in modeling accurately in the transformer fault diagnosis model, and provides an online transformer state diagnosis method based on PMU data, which is a Using the intelligent algorithm fusion method based on multivariate gray forecasting model and improved evidence theory

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  • A Online Diagnosis Method of Transformer Status Based on pmu Data
  • A Online Diagnosis Method of Transformer Status Based on pmu Data
  • A Online Diagnosis Method of Transformer Status Based on pmu Data

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Embodiment Construction

[0032] Such as Figure 1-4 Shown, the present invention comprises the following steps:

[0033] Step 1. Obtain PMU data from the power system PMU, and process the obtained PMU data;

[0034] Step 2, performing filtering and denoising processing on the PMU data;

[0035] Step 3, extracting the transformer operating characteristic parameters according to the PMU data, and establishing the transformer operating state evaluation index system;

[0036] Step 4, using the hierarchical-entropy weight combination weight method to calculate the impact weight of each evaluation index on the final evaluation result;

[0037] Step 5, using the multi-variable gray prediction model and the intelligent algorithm fusion method of improved evidence theory to establish the transformer online operation status evaluation model;

[0038] Evidence theory state assessment model;

[0039] Let Θ be the identification frame, 2 Θ is a power set of Θ. if function m:2 Θ →[0,1], and satisfy m(Φ)=0, ...

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Abstract

The invention relates to the technical field of transformer online detection, in particular to an online transformer state diagnosis method based on PMU data. First, use the poor information of the gray forecasting system, based on past and present known and uncertain information, build a gray model by accumulating or subtracting the original data, use time series data to determine the parameters of the differential equation, and gradually make the gray quantity Whitening, and make a scientific prediction of the future state of the system, that is, predict the quantitative index parameters of electrical equipment at the future time through the gray prediction model; secondly, use the improved evidence theory to model the transformer fault diagnosis model, and combine the future time predicted by the gray model Quantitative index parameters effectively reduce the evidence conflict rate and make the model more accurate. A transformer state evaluation system is constructed, which is composed of a number of indicators, and according to the characteristics of the transformer itself, a grading strategy for transformer state evaluation is given.

Description

technical field [0001] The invention relates to the technical field of transformer online detection, in particular to a method for online diagnosis of transformer status based on PMU data. Background technique [0002] The appearance of synchrophasor measurement technology PMU (Phase Measurement Unit) based on GPS (Global Positioning System) has formed a wide area measurement system WAMS (Wide Area Measurement System). [0003] Based on the application of GPS technology, the PMU measurement device is equivalent to having a global synchronous clock, so it can directly collect the node voltage amplitude and phase angle of the entire network. At the same time, it can also measure the phase angle and amplitude of the collected current, the rate of change of frequency, the protection action of important switching nodes, the power angle of the generator, etc. The PMU-based wide-area measurement system can detect the dynamic process of the power system, and the measured data can r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/06G01R31/00
CPCG06Q10/0635G06Q10/0639G01R31/00
Inventor 王福才刘树鑫赵恩民
Owner 辽宁正泰智能电气有限公司
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