Protection method of DC connection line in energy storage power station
A technology for energy storage power stations and connection lines, which is applied in the direction of protection that responds to fault currents, and can solve problems such as low reliability, high cost of differential protection devices, and poor economy, so as to ensure no misoperation and improve reliability Effect
Active Publication Date: 2016-11-16
STATE GRID CORP OF CHINA +2
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Problems solved by technology
Install differential protection on the DC connection line. When an out-of-area fault occurs, according to Kirchhoff's current law, the DC current values on both sides of the line are equal, so it will not malfunction. Once a fault occurs on the DC connection line, Then the faulty line can be quickly cut off, but the cost of the differential protection device is high, and the length of the DC connection line in the energy storage power station is relatively short, so it is feasible to use differential protection for the protection of the negative DC connection line when the negative pole of the battery is grounded. , but it needs to detect the current value at both ends of the line, the reliability is relatively low, and the economy is relatively poor
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[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0022] See figure 1 , the present invention is realized through the following technical solutions, and the inventive method is as follows:
[0023] Step S01: Obtain the theoretical value of the DC current on the DC connection line through theoretical calculation, and use this data as a reference;
[0024] Step S02: According to the theoretical value of the current on the DC connection line, combined with the current value on the DC connection line under normal operation, set the protection setting value;
[0025] Step S03: Detect the magnitude of the DC current value at the place where the protection is installed, compare the actual DC current value with the setting value of the protection, and determine whether the protection operates according to the comparison result.
[0026] In the step S01, the calculation method of the theoretical value of the ...
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The invention relates to a protection method for metallic earth fault clearance of a negative-electrode direct-current connecting wire under the circumstances of the battery negative electrode grounding of the energy storage power station. The protection method comprises the following steps that: a theoretical value of a direct current of a direct-current connecting wire is obtained by calculation and is used a reference; according to the theoretical value, a protection setting value is set by combining the current value of the direct-current connecting wire on the normal operation condition; and a direct current value of a protection installation position is detected and an actual direct current value is compared with the protection setting value, and whether protection is carried out is decided according to the comparison result. According to the invention, under-volume current protection is used. The simulation result demonstrates that a fault can be detected reliably and the protection motion can be prepared; and high sensitivity and high reliability can be realized even under the circumstances of transition resistance consideration. Therefore, the provided protection method is suitable for metallic earth fault clearance of the negative-electrode direct-current connecting wire under the circumstances of battery negative electrode grounding of the energy storage power station.
Description
technical field [0001] The invention relates to a protection method for a DC connection line in an energy storage power station. Specifically, when the negative pole of the battery in the energy storage power station is grounded, an undercurrent protection method is adopted for the occurrence of a metallic grounding fault on the DC connection line of the negative pole. Used in the field of relay protection. Background technique [0002] With the development of society and economy, the electric power industry has developed rapidly, and has entered the era of large power grids characterized by ultra-high voltage, large units, cross-regional networking, and AC-DC hybrids. It will endanger the power supply of the whole region and seriously affect the social and economic order. Therefore, distributed power generation with improved safety and reliability and peak-shaving energy storage has attracted more and more attention. As a distributed power source with strong operation sta...
Claims
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IPC IPC(8): H02H3/16
Inventor 陈彬吴涵郑高
Owner STATE GRID CORP OF CHINA