Method and device for hybrid configuration of circuit breakers in flexible direct current grid
A DC circuit breaker, flexible DC technology, applied in the direction of DC network circuit devices, circuit devices, emergency protection circuit devices, etc. Mixed use and other issues to achieve the effect of saving engineering investment
Active Publication Date: 2018-12-14
STATE GRID CORP OF CHINA +2
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Problems solved by technology
There is no case of mixing fast mechanical switches with fully controlled DC circuit breakers, full-bridge converters and half-bridge converters in DC systems
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[0041] Example: Taking the flexible DC power grid project in Zhangbei area as an example, as figure 2 shown. Build 4 Rouzhi converter stations, Fengning and Beijing converter stations adopt half-bridge converters, Zhangbei converter station and Kangbao converter station adopt full-bridge scheme. Full-controlled DC circuit breakers are installed on the Beijing side of the Zhangbei-Beijing line, on the Fengning side of the Kangbao-Fengning line, on both sides of the Beijing-Fengning line, and between the Kangbao-Zhangbei line. Mechanical fast DC switches are installed at the exits of each converter station, on both sides of the Kangbao-Zhangbei line, and at the head end of the Kangbao-Fengning and Zhangbei-Beijing lines.
[0042] Zhangbei and Kangbao converter stations use full-bridge converters, which have the ability to clear faults. Assuming that the DC line between Kangbao and Fengning fails, the Kangbao station will be blocked, and the process of clearing the fault is as...
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The invention relates to a circuit breaker hybrid configuration method and device for a flexible DC power grid, and the device comprises transmitting end convertor stations, receiving end convertor stations, DC reactors, mechanical-type high-speed switches, and full-control type DC circuit breakers. The output end, located at a transmitting end convertor station circuit side, of each transmitting end convertor station is connected with a first branch circuit, formed by the series connection of the first and second mechanical-type high-speed switches, through the first DC reactor. A second branch circuit, formed through the series connection of the third and fourth mechanical-type high-speed switches and the first full-control type DC circuit breaker, is connected between the two first branch circuits in a parallel manner. The input end, located at a receiving end convertor station circuit side, of each receiving end convertor station is connected with one end of the second DC reactor, and a third branch circuit, formed by the series connection of the second full-control type DC circuit breaker and the fifth mechanical-type high-speed switch, is connected with the other end of the second DC reactor. A fourth branch circuit, which is formed by the series connection of the third and fourth full-control type DC circuit breakers, is connected between the two third branch circuits. The device can be widely used in a high-voltage flexible DC power transmission network.
Description
technical field [0001] The invention relates to a circuit breaker hybrid configuration method and device, in particular to a circuit breaker hybrid configuration method and device for a flexible DC power grid. Background technique [0002] At present, high-voltage flexible direct current transmission using modular multilevel converters (MMCs) is an important way to solve large-scale centralized transmission of new energy. Taking the Zhangbei region of my country as an example, to transfer wind power from Zhangbei and Kangbao regions to Beijing and Fengning in northern Hebei through flexible DC transmission, it is necessary to build a four-terminal flexible DC transmission network. When using a flexible DC grid for long-distance power transmission, considering the economy, DC cables should not be used between converter stations, but DC overhead lines should be used. The application of DC overhead lines increases the probability of failure on the DC side. [0003] In order t...
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IPC IPC(8): H02J1/00H02H7/26
CPCH02H7/262H02H7/268H02J1/00
Inventor 肖晋宇李晖左鹏王菲杨林王峤戚庆茹蒋维勇黄俊辉谢珍建蔡晖
Owner STATE GRID CORP OF CHINA