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Protection method for preventing high-voltage capacitor breakdown in filter

A high-voltage capacitor and filter technology, applied in the field of electricity, can solve the problems of low sampling frequency and difficulty, and achieve the effect of low threshold, direct judgment object and high calculation accuracy

Inactive Publication Date: 2009-07-15
XUJI GRP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of hardware cost, the current protection device generally has a low sampling frequency (24 points / cycle or 48 points / cycle), and it is very difficult to accurately calculate the magnitude of high-order harmonics

Method used

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  • Protection method for preventing high-voltage capacitor breakdown in filter
  • Protection method for preventing high-voltage capacitor breakdown in filter
  • Protection method for preventing high-voltage capacitor breakdown in filter

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Embodiment Construction

[0031] Combine below Figure 1 to Figure 5 , the principles and working steps of the present invention are described and demonstrated in detail.

[0032] 1. Introduction to the signal processing process:

[0033] figure 1 It is a schematic diagram of the composition of the filter (the left is a double-tuned filter, and the right is a three-tuned filter), and the high-voltage capacitor C 1 Located at the top of the filter, it bears most of the system voltage; usually with the inductor L 1 Form a resonance and become a resonance frequency point of the filter; figure 2 For the whole signal processing process of the present invention: each harmonic current flowing through the high-voltage capacitor and passing through the current converter T 1 transformed into I sum Flow into the protection device; after the TA transformation of the protection device, a weak current signal I is formed sum.2 ; The integration circuit integrates the weak current signal into a voltage value U ...

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Abstract

The present invention provides a protection method used to stop high-voltage capacitor in a filter from being breakdown. Under the condition that high-voltage capacitor bearing pressure cannot be obtained directly, calculate periodic crest voltage on the high-voltage capacitor precisely through sum of each subharmonic electrical current that can be measured; under the condition that bearing voltage peak exceeds allowable range, send warning or trip information on time to prevent the high-voltage capacitor from being breakdown and damaged. The outstanding feature of the invention is to increase independent loop realization on original protecting equipment platform without improving sampling frequency of the protecting equipment and CPU calculate burden greatly, and avoid exorbitant hardware cost. Compared with original over current protection scheme, the new scheme grasps the underlying cause of the damage of the high-voltage capacitor, protection criterion is clearer and more direct with higher precision, the protection effect is better and is worth to be widely promoted.

Description

technical field [0001] The invention relates to the field of electricity, in particular to a protection method for a filter in direct current transmission for preventing high-voltage capacitors in the filter from being broken down. The invention is mainly applicable to filters, shunt capacitors and other equipment of medium and high voltage levels in direct current transmission. Background technique [0002] DC transmission is a power transmission method that has developed rapidly in China in recent years. The core principle is to rectify AC power into DC power through a converter for transmission, and then convert the DC power into AC power through the converter and send it to the AC grid. Due to the nonlinear characteristics of the converter, large harmonic components will be generated during operation, which will affect the power quality of the AC grid; in addition, the rectifier will absorb capacitive reactive power from the AC grid. Therefore, various types of filter e...

Claims

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Application Information

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IPC IPC(8): H02J1/02
Inventor 张振华赵斌赵艳茹宋宏涛张红跃胡晓静
Owner XUJI GRP
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