Protection method for preventing high-voltage capacitor breakdown in filter
A high-voltage capacitor and filter technology, applied in the electrical field, can solve problems such as difficulty and low sampling frequency, and achieve the effects of direct judgment, low threshold for realization, and high calculation accuracy.
Inactive Publication Date: 2010-08-25
XUJI GRP +1
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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
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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 The present invention relates to the field of electricity, and in particular to a protection method for a filter in a direct current transmission to prevent a high-voltage capacitor in the filter from being broken down. The invention is mainly suitable for high-voltage filters, parallel capacitors and other equipment in DC transmission. Background technique DC transmission is a power transmission method that has developed rapidly in recent years in China. The core principle is to rectify AC power to DC power through a converter for transmission, and then convert the DC power to AC power through the converter to send it to the AC grid. Due to the non-linear 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 equipment (including shunt capacitors) are w...
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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