Multi-loop ground fault analysis method and device, electronic equipment and storage medium

A fault analysis method and wire grounding technology, applied in the direction of measuring devices, measuring electricity, measuring electrical variables, etc., can solve the problems of easy faults, poor insulation level, and grounding short-circuits of micro-network cables.

Inactive Publication Date: 2021-03-19
广东电网有限责任公司韶关供电局
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, since small hydropower microgrids are generally distributed in villages or mountainous areas, microgrid lines are prone to failures
In addition, the small hydropower microgrid generally adopts the non-direct grounding operation mode of the neutral point. When a single-phase ground fault occurs at one point, the voltage of the other two phases will rise. Grounding short circuit, resulting in multi-line grounding faults in different places

Method used

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  • Multi-loop ground fault analysis method and device, electronic equipment and storage medium
  • Multi-loop ground fault analysis method and device, electronic equipment and storage medium
  • Multi-loop ground fault analysis method and device, electronic equipment and storage medium

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Embodiment 1

[0034] figure 1 It is a flowchart of a multi-circuit ground fault analysis method provided by Embodiment 1 of the present invention. This embodiment is applicable to the situation of multi-circuit ground fault analysis, and the method can be executed by a multi-circuit ground fault analysis device. Specifically include the following steps:

[0035] S110. Establish a compound sequence network diagram of the fault by using the symmetrical component method and the multi-port network theory.

[0036] Among them, the method of symmetrical components (method of symmetrical components) is a basic method in electrical engineering to analyze the asymmetrical operation state of a symmetrical system. It is widely used in the calculation of electrical quantities with symmetrical parameters and asymmetrical operating conditions in three-phase AC systems. For example, when a single-phase ground fault occurs in a three-phase symmetrical network, there will be local asymmetry in the three-p...

Embodiment 2

[0046] figure 2 It is a flowchart of a multi-circuit ground fault analysis method provided by Embodiment 2 of the present invention. This embodiment is applicable to the situation of multi-circuit ground fault analysis, and the method can be executed by a multi-circuit ground fault analysis device. Specifically include the following steps:

[0047] S210. According to the multi-port network theory, introduce an ideal transformer at the fault point; set the transformation ratio of the ideal transformer according to the fault phase, and form a composite sequence network diagram.

[0048] Among them, the ideal transformer is a reciprocal passive two-port network in which the voltage at one port is proportional to the voltage at the other port and has no power loss. It is an ideal circuit element abstracted from the electrical characteristics of the core transformer. According to the symmetrical component method and multi-port network theory, an ideal transformer is introduced a...

Embodiment 3

[0081] Figure 5 It is a schematic structural diagram of a multi-circuit ground fault analysis device in Embodiment 3 of the present invention. This embodiment is applicable to the situation of multi-circuit ground fault analysis. See Figure 5 , the device consists of:

[0082] Composite sequence network diagram building module 310, used to establish a fault composite sequence network diagram through the symmetrical component method and multi-port network theory;

[0083] The loop current equation establishment module 320 is used to establish the fault point loop current equation according to the composite sequence network diagram;

[0084]The fault boundary equation establishment module 330 is used to establish the fault boundary condition equation according to the relationship between the sequence components of the fault point voltage;

[0085] The current and voltage calculation module 340 is used to obtain each sequence current of the fault line and the zero-sequence vo...

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Abstract

The invention discloses a multi-loop ground fault analysis method and device, electronic equipment and a storage medium. The method comprises the following steps: establishing a composite sequence network diagram of a fault through a symmetrical component method and a multi-port network theory; establishing a fault point loop current equation according to the composite sequence network diagram; establishing a fault boundary condition equation according to the voltage sequence component relationship of the fault point; and according to the fault point loop current equation and the fault boundary condition equation, solving each sequence current of the fault line and the zero sequence voltage of the fault point. According to the invention, the fault analysis of multi-loop line grounding is realized, the protection line can be configured and improved by calculating and analyzing the zero-sequence voltage of the fault point, and the multi-loop line complex fault in a microgrid can be detected more quickly.

Description

technical field [0001] Embodiments of the present invention relate to a multi-circuit ground fault analysis technology, in particular to a multi-circuit ground fault analysis method, device, electronic equipment, and storage medium. Background technique [0002] Small hydropower is a relatively common distributed power source, and its capacity is generally below 50MW. It is common in rural areas and mountainous areas where electricity consumption is small. It can be used as a power source in a microgrid, and can also supplement the power supply of a large grid. [0003] However, since small hydropower microgrids are generally distributed in villages or mountainous areas, microgrid lines are prone to failures. In addition, the small hydropower microgrid generally adopts the non-direct grounding operation mode of the neutral point. When a single-phase ground fault occurs at one point, the voltage of the other two phases will rise. Grounding short circuit, resulting in multi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/52G01R31/58G06F30/20G06F17/11G06F17/16
CPCG01R31/52G01R31/58G06F30/20G06F17/11G06F17/16
Inventor 陈永进黄天敏刘志勇胡高峰
Owner 广东电网有限责任公司韶关供电局
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