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Method suitable for determining grounding resistance scheme of flexible direct-current power distribution system

A flexible DC power distribution and grounding resistance technology, applied in the field of intelligent distribution network, can solve the problem of low grounding resistance in the system grounding mode, and achieve the effect of improving the reliability of power supply

Active Publication Date: 2015-12-02
SOUTH CHINA UNIV OF TECH +1
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  • Claims
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Problems solved by technology

At present, domestic and foreign research on DC distribution networks mainly focuses on system architecture, control and protection technology, and there are relatively few studies on system grounding methods and selection of grounding resistance.

Method used

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  • Method suitable for determining grounding resistance scheme of flexible direct-current power distribution system
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  • Method suitable for determining grounding resistance scheme of flexible direct-current power distribution system

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Embodiment

[0030] A method for determining a grounding resistance scheme applicable to a flexible DC power distribution system, comprising the following steps

[0031] S1 According to the topological structure of the flexible DC power distribution system, analyze the fault current path when the DC single-pole ground fault occurs under the grounding mode of the AC side of the system;

[0032] like figure 1 It is a schematic diagram of the topological structure of the 10kV flexible DC distribution network. The system adopts a "hand in hand" main circuit structure with two independent AC power sources. The system adopts a unipolar symmetrical main wiring form. It is connected to the 10kV AC system through a 10 / 10kV connecting transformer, and cables are used for the DC line. The DC line is connected to the AC and DC loads or the AC and DC microgrids respectively through the DC / AC converter and the DC transformer DC / DC to realize DC power distribution. In this embodiment, the AC load / micro...

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Abstract

The invention discloses a method suitable for determining a grounding resistance scheme of a flexible direct-current power distribution system. According to the method, the influence of grounding resistance on a fault ground current under a monopolar grounding fault of the direct-current power distribution system is determined through analyzing a path of a fault current under the monopolar grounding fault of the system; the requirements for ground current are determined from the perspective of ensuring continuous operation safety of the system under the monopolar grounding fault and ensuring direct-current differential protection correct actions, thereby determining requirements for grounding resistance respectively; and a grounding scheme that a neutral point is grounded through a parallel resistor is disclosed through synthesizing requirements for the grounding resistance in various aspects. The grounding scheme disclosed by the invention is capable of increasing power supply reliability of the flexible direct-current power distribution system, and ensuring flexibility of system protective actions.

Description

technical field [0001] The invention relates to the field of intelligent distribution network based on flexible direct current, in particular to a method for determining a grounding resistance scheme applicable to a flexible direct current distribution system. Background technique [0002] With the rapid development of distributed energy and loads, the smart distribution network based on flexible DC has become the development trend of urban distribution network. At present, domestic and foreign research on DC distribution networks mainly focuses on system architecture, control and protection technology, and there are relatively few studies on system grounding methods and selection of grounding resistance. The grounding of the flexible DC power distribution system provides a reference potential for the entire system. The design of the grounding scheme needs to comprehensively consider the power supply reliability requirements, power grid and line structure, overvoltage and in...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 何秋萍韩永霞赵宇明姚森敬刘国伟
Owner SOUTH CHINA UNIV OF TECH
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