A series compensation damping circuit protection method and system
A circuit protection and damping technology, which is applied in the field of series compensation protection, can solve the problems of detection and protection of the damping circuit lacking damping reactors, and achieve the effects of alleviating the contradiction between power supply and demand, saving investment, and reducing network loss
Active Publication Date: 2018-11-06
EXTRA HIGH VOLTAGE POWER TRANSMISSION NANJING OF CHINA SOUTHERN POWER GRID
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Problems solved by technology
In the existing fault detection devices and methods, the detection and protection of the damping loop of the damping reactor is lacking. Since the damping loop plays a key role in the spark gap protection of the series compensator, the protection of the damping loop is also of great significance
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[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings and embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them.
[0026] see figure 1 It is a protection method for a series compensation damping circuit according to an embodiment of the present invention, the damping circuit is a parallel circuit of a resistor and a reactor, and the parallel circuit is connected at both ends of the spark gap, comprising the following steps:
[0027] Step 1, collect the current waveform of the series compensation damping circuit, and perform high-pass filtering on the current waveform;
[0028] Step 2, obtain the peak value of the first seven periods of the filtered current waveform, and judge whether the peak value is less than the current upper limit value, and stop the detection if it exceeds, otherwise continue to the su...
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The invention provides a series compensation damping circuit protection method and system. The method comprises the steps that (1) the current waveform of a series compensation damping loop is collected, and high-pass filtering is carried out on the current waveform; (2) the peak of the first seven cycles of the filtered current waveform is acquired; whether the peak is less than the current upper limit is determined; is the peak is less than the current upper limit, detection is stopped, otherwise a next step is continued; (3) for the current waveform of the first seven cycles, the peaks of adjacent half-cycles are compared; if the ratio of the average value of is below the current threshold, a resistor is normal; if the average value of the ratio is greater than the threshold, the resistor is failed; and (4) the frequency of the high-pass filtered current waveform is acquired; the difference between the measured frequency and a theoretically calculated value is calculated; if the ratio of the difference is greater than the frequency threshold, a reactor is considered to be failed. According to the method and system, detection protection of the resistor and the reactor of the damping loop under industrial frequency component filtering is realized.
Description
technical field [0001] The invention relates to the field of series compensation protection, in particular to a series compensation damping circuit protection method and system. Background technique [0002] The geographical distribution of the existing primary energy and power loads is very different, especially in some places. With economic development, the contradiction between supply and demand between energy supply and power consumption is becoming more and more serious. Long-distance, large-capacity, and cross-regional power transmission can effectively alleviate the contradiction between power supply and demand, which has become one of the most important features of modern power systems. Ability puts forward higher requirements. The series capacitor compensation technology of the AC transmission system that connects power capacitors in series to the AC transmission line compensates part of the inductive impedance of the AC transmission line, and realizes the purpose ...
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IPC IPC(8): H02H9/02H02J3/18
CPCY02E40/30
Inventor 廖华苏晓贾筱莹朱伟邓朝翥柳明姜宪彬李锐李黄河何山
Owner EXTRA HIGH VOLTAGE POWER TRANSMISSION NANJING OF CHINA SOUTHERN POWER GRID