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A Method for Predicting Capacitor Capacitance and Its Variation Trend Based on Time Series Method

A changing trend, time series technology, applied in forecasting, instrumentation, data processing applications, etc., can solve problems such as protection malfunction, burnout, capacitor and reactor damage, etc.

Active Publication Date: 2019-03-22
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aging capacitors may amplify harmonic currents, aggravate harmonic hazards, and may generate harmonic resonance in severe cases, amplifying harmonic currents several times or even dozens of times, resulting in the danger of overcurrent and overvoltage, making capacitors and reactance damaged or burnt
Taking a large-capacity collective capacitor as an example, if there is a failure of a small capacitive element inside it, although its power frequency steady-state reactive power compensation performance will not be affected basically, harmonics will easily cause its internal fault protection to malfunction and affect the normal operation of the capacitor

Method used

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  • A Method for Predicting Capacitor Capacitance and Its Variation Trend Based on Time Series Method
  • A Method for Predicting Capacitor Capacitance and Its Variation Trend Based on Time Series Method
  • A Method for Predicting Capacitor Capacitance and Its Variation Trend Based on Time Series Method

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Embodiment Construction

[0041] Embodiment adopts capacitor capacitance value of the present invention and method for predicting its variation tendency, and its specific implementation steps are as follows:

[0042] (a) Collect sample data

[0043] From the time when the capacitor is put into operation to the time when the prediction is made, the cumulative running time of the capacitor is divided into equal time intervals H in sequence, and the average capacitance value of the capacitor in each time interval H is taken as a sample C i , where i=1,2,...,N, where N is the sample size; each sample C i Given a sample time T(i), T(i)=i, i=1,2,...,N.

[0044] When dividing the accumulative operating time of the capacitor into equal time intervals, for the last remaining time period, ignore this period when its operating time is less than H / 2; when its operating time is not less than H / 2, this period The average capacitance value of the inner capacitor is also taken as a sample.

[0045] In this embodime...

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Abstract

The invention relates to the technical field of power quality analysis, and particularly relates to a capacitor capacitance value and change trend forecasting method based on a time series method. For the lack of effective capacitor capacitance value and change trend forecasting in the prior art, the invention provides the capacitor capacitance value and change trend forecasting method based on the time series method. According to the invention, sample data are collected; a capacitance value change trend forecasting model is established; a capacitance value forecasting model is established; a capacitance value is forecasted; and effective and accurate capacitor capacitance value and change trend forecasting is realized. The algorithm provided by the invention has the advantages of comprehensive design consideration, low implementation cost, reliable forecasting effect and broad application prospect, and is compatible with various types of capacitors of the existing power industry.

Description

technical field [0001] The invention relates to the technical field of power quality analysis, in particular to a method for predicting capacitor capacitance and its variation trend based on a time series method. Background technique [0002] With the development of modern industry, nonlinear electrical equipment such as converter equipment, electric arc furnace, and asymmetrical loads are widely used in fields such as DC transmission, metallurgy, chemical industry, and electrified railways. These nonlinear electrical equipment will generate A large amount of reactive power is required, and a large number of harmonics are injected into the grid, causing voltage waveform distortion and power quality degradation. Installing shunt capacitors in the power system and the majority of power users is the most important and widely used technical means to compensate reactive power and filter harmonics. [0003] In the power system, if the shunt capacitor installed in the substation a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/04G06Q50/06
Inventor 周文段晓波胡文平饶群王生彬毛志芳郭捷王磊
Owner STATE GRID CORP OF CHINA
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