An autonomous switching method of a transformer neutral point ground current suppression device
A transformer neutral point and suppression device technology, applied in the direction of circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve the problem of changing the circuit structure and aggravating the neutral point of the transformer Current intrusion and other issues to achieve the effect of improving reliability, reducing impact, and reducing changes
Active Publication Date: 2021-07-27
HUAZHONG UNIV OF SCI & TECH +1
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At the same time, due to the complex electrical connection between AC transformers in substations, installing a ground current suppression device at the neutral point of a transformer can effectively suppress the ground current invading the neutral point of the transformer, but it will aggravate the Invasion of neutral point ground current of other transformers
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[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other.
[0026] An embodiment of the present invention provides a transformer neutral point current suppression device, such as figure 1 As shown, including: ground current 6th harmonic suppression module, 6th harmonic suppression module switching switch, ground current 12th harmonic suppression module, 12th harmonic suppression module switching switch, ground current DC component suppression module, DC ...
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The invention discloses an autonomous switching method of a transformer neutral point ground current suppression device, which comprises a ground current DC component suppression module, a ground current multiple harmonic suppression module, a DC component suppression module switching switch, and a multiple harmonic suppression module. Module switching switch, current sensor, signal acquisition module and switching control module; receive current digital signals and switch status signals of all transformer neutral points in the area where switching control is required; decompose current digital signals to obtain DC components and The multi-harmonic component is compared with the corresponding preset threshold value, if the threshold is exceeded, the ground current component is too large, and the ground current DC component suppression module and the ground current multiple harmonic suppression module that achieve the ground current suppression effect are solved Invest in the least amount of solutions to achieve ground current suppression. The invention can effectively suppress the ground current of the neutral point of the transformer in the region as a whole, and improve the stability of the power system.
Description
technical field [0001] The invention belongs to the technical field of safe operation of electric power systems, and more specifically relates to an autonomous switching method of a transformer neutral point ground current suppressing device. Background technique [0002] Since the beginning of the 21st century, with the rapid improvement of my country's economic strength, rail transit, which has the characteristics of safety, stability and high efficiency, has developed rapidly in large and medium-sized cities in my country as a new type of transportation. As of the end of 2018, a total of 35 cities in mainland China have built rail transit lines of 5766.6km. Dense rail traffic will generate frequent stray currents with DC and AC components during operation. At present, rail transit mainly uses multi-pulse rectifier units as its traction power supply system. According to on-site measurement data, multi-pulse rectifier units are limited by the transformer manufacturing proc...
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IPC IPC(8): H02H7/04H02H9/08H02H7/00
CPCH02H1/0007H02H7/008H02H7/04H02H9/08
Inventor 王丹王照远李强曾海燕李刚石一辉邹芹李松蔡骏峰贾凯汤胜袁军强方翰朱劲力
Owner HUAZHONG UNIV OF SCI & TECH