Flexible DC power distribution network fault positioning method
A distribution network fault and location method technology, which is applied to the fault location, detects faults according to conductor types, and measures electricity. It can solve problems such as flexible DC distribution network fault location, reduce the risk of difficult adjustments, and avoid false starts. , the effect of improving sensitivity
Inactive Publication Date: 2020-03-27
NARI TECH CO LTD +2
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[0009] Purpose: In order to solve the problem of flexible DC distribution network fault location, the present invention provides a flexible DC distribution network fault location method
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[0077] In order to illustrate the positioning method of the present invention, as figure 1 As mentioned above, the following examples are given. The DC power distribution network includes a connection transformer, a converter station H1, a switching station K1, and a power distribution room. route road. Such as figure 2 As shown, the DC busbar protection zone includes 1 busbar at the outlet end of the converter station, and 2 switches connected to it, and 2 busbars at the switch station, and 6 switches connected to it. Such as image 3 As shown, the DC line protection zone includes a converter station outgoing line bus outlet, and two switches on the outgoing line, two switching station bus lines, and four switches on the outgoing line. However, the DC power distribution network structure is only used as an implementation form of the idea of the present invention, and the present invention is also applicable to similar power supply system structures. This method deals w...
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The invention discloses a flexible DC power distribution network fault positioning method. The method is characterized by setting a DC bus protection area and a DC line protection area in a DC power distribution network, configuring the protection devices for the switches in the DC bus protection area and the DC line protection area, and connecting all the protection devices through a high-speed communication network; when the differential protection is normal, adopting the differential protection for fault positioning, and when the differential protection exits, adopting a comprehensive faultpositioning method based on the multi-point direction for fault positioning. According to the invention, the problem that the time delay of the networked protection actions applied to the direct-current power distribution network is longer, is solved; the problem that the DC power distribution network loses the backup protection when the differential protection is abnormal and cannot work is solved; and the problem that the overcurrent starting sensitivity and the setting matching simplicity of the direct-current power distribution network cannot be achieved at the same time is solved.
Description
technical field [0001] The invention relates to a fault location method for a flexible DC distribution network, belonging to the technical field of power system protection and control. Background technique [0002] With the emergence of voltage source converters, flexible HVDC technology based on modular multilevel converters (MMCs) has developed rapidly. At the same time, with the large-scale access of DC loads and distributed new energy sources, the characteristics of the current distribution network source-load-storage DC are becoming more and more significant. Flexible DC power distribution provides a flexible, efficient and environmentally friendly power distribution method, and does not require auxiliary equipment such as filters and reactive power compensation. [0003] The development of DC distribution network still faces several key technical problems to be solved urgently, including fast and reliable location and isolation of DC fault sections. In the DC power d...
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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 吴通华姚刚王小红郑玉平洪丰戴魏李新东陈国洲江源郑小江侯小凡胡子龙郑坤承
Owner NARI TECH CO LTD