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Method and system for prolonging service life of capacitor of TSC

A capacitor and life-span technology, applied in flexible AC power transmission systems, system integration technologies, information technology support systems, etc., can solve problems such as the inability to effectively prolong the life of capacitors and reduce the damage rate of capacitors, so as to reduce maintenance costs and prolong service life. Longevity and the effect of reducing the damage rate

Pending Publication Date: 2022-01-21
上海希形科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention does not include the harmonic current and ambient temperature when the capacitor is working into the consideration of optimizing the life of the capacitor, which cannot effectively prolong the service life of the capacitor in the TSC and reduce the damage rate of the capacitor

Method used

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  • Method and system for prolonging service life of capacitor of TSC
  • Method and system for prolonging service life of capacitor of TSC
  • Method and system for prolonging service life of capacitor of TSC

Examples

Experimental program
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Effect test

Embodiment 1

[0091] A kind of method for prolonging the electric capacity life-span of TSC provided according to the present invention, such as Figure 1-Figure 2 shown, including:

[0092] Step S1: Calculate the characteristic value of the fatigue degree caused by the current and the characteristic value of the fatigue degree caused by the ambient temperature;

[0093] Step S2: Calculate the characteristic value of the total fatigue degree and limit it;

[0094] Step S3: Read the characteristic values ​​of capacitor fatigue in all switches;

[0095] Step S4: Calculate the reactive power gap of the power grid, and judge whether it is necessary to invest in capacitors. If it is necessary to invest, search for capacitors with low fatigue and then proceed to the next step; if not, directly run the next step;

[0096] Step S5: classify the capacitors according to the degree of fatigue;

[0097] Step S6: End the operation when the capacitor with the highest fatigue degree is not the capacito...

Embodiment 2

[0128] Embodiment 2 is a preferred example of Embodiment 1 to describe the present invention more specifically.

[0129] Those skilled in the art can understand a kind of method for extending the life of capacitor of TSC provided by the present invention as the specific implementation of the system for extending the life of capacitor of TSC, that is, the system for extending the life of capacitor of TSC It can be realized by executing the steps of the method for extending the service life of a capacitor for a TSC.

[0130] A system for prolonging the life of a capacitor for TSC according to the present invention includes:

[0131] Module M1: Calculate the characteristic value of the fatigue degree caused by the current and the fatigue degree characteristic value caused by the ambient temperature;

[0132] Module M2: Calculate the eigenvalue of the total fatigue degree and limit it;

[0133] Module M3: Read the characteristic values ​​of capacitor fatigue in all switches;

...

Embodiment 3

[0167] Embodiment 3 is a preferred example of Embodiment 1 to describe the present invention more specifically.

[0168] The invention proposes a method for prolonging the life of a capacitor used in TSC. Compared with the existing method, the method fully considers the influence of the harmonic current of the capacitor and the temperature of the working environment on the life of the capacitor.

[0169] The control part of the TSC is composed of a controller and a thyristor switcher, and the calculation of capacitor fatigue is carried out in each thyristor switcher. The controller checks the fatigue degree of all capacitors every minute, and judges whether the capacitors should be switched on or off.

[0170] The method proposed by the invention is divided into a method for calculating the capacitor fatigue degree in a thyristor switching device and a method for selecting capacitor switching in a controller.

[0171] The present invention realizes the purpose of calculating ...

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Abstract

The invention provides a method and system for prolonging the service life of a capacitor of a TSC. The method comprises the following steps: calculating a fatigue characteristic value caused by current and a fatigue characteristic value caused by environment temperature; calculating a total fatigue characteristic value and carrying out amplitude limiting; capacitance fatigue characteristic values in all the switching devices are read; calculating a reactive gap of the power grid, judging whether a capacitor needs to be input or not, if so, searching for the capacitor with low fatigue for input, and then performing the next step; if not, directly running the next step; classifying the capacitors according to the fatigue degree; and when the capacitor with the highest fatigue degree is not the capacitor to be cut off or the capacitor with the lowest fatigue degree is not the capacitor to be input, ending operation. Compared with the prior art, the harmonic current and the environment temperature when the capacitor works are taken into consideration for optimizing the service life of the capacitor. The service life of the capacitor in the TSC can be effectively prolonged, and the damage rate of the capacitor is reduced; and the maintenance cost can be reduced, and the reliability of the TSC is improved.

Description

technical field [0001] The present invention relates to the technical field of charging, in particular to a method and system for extending the service life of a capacitor for a TSC. Background technique [0002] With the development of power electronics technology and computer control technology, various new automatic and fast reactive power compensation devices have emerged one after another. Thyristor switched capacitor (TSC) is a dynamic reactive power compensation device widely used in power distribution systems. [0003] As the current harmonic content in factories is getting bigger and bigger, the life of capacitors is getting shorter and shorter. In many industrial places, capacitors will be damaged after about one year of use. [0004] At present, TSC input capacitors generally follow the principle of first-in-first-cut, try to ensure that the capacitors can be used evenly, and extend the life of the capacitors as long as possible. However, the reactive power in ma...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J13/00
CPCH02J3/1864H02J13/00016Y02E40/10Y02E40/70Y02E60/00Y04S10/22Y04S40/124
Inventor 张宁
Owner 上海希形科技有限公司