Risk theory-based medium and lower voltage distribution network neutral point grounding mode decision-making method

A low-voltage distribution network, neutral point grounding technology, applied to electrical components, emergency protection circuit devices, etc.

Active Publication Date: 2018-09-28
GUIZHOU POWER GRID CO LTD
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a decision-making method for the neutral point grounding mode of medium and low-voltage distribution networks based on risk theory, so as to solve the research on the decision-making method of the neutral point grounding mode of the existing medium-voltage distribution network. In terms of economy and reliability, safety considerations are mainly focused on equipment safety, ignoring the measurement of the severity of the impact of medium and low voltage distribution network failures on personal safety

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  • Risk theory-based medium and lower voltage distribution network neutral point grounding mode decision-making method
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  • Risk theory-based medium and lower voltage distribution network neutral point grounding mode decision-making method

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Embodiment Construction

[0038] A risk theory-based decision-making method for the neutral point grounding mode of medium and low voltage distribution networks, which includes:

[0039] Step 1. Collect and organize data, including: structural characteristics of medium and low voltage distribution networks and power supply area conditions; relay protection parameters and single-phase fault data; overvoltage statistical data; power outage time and number of households during power outages;

[0040] Step 2. Establish the risk indicators of the neutral point grounding mode of the medium and low voltage distribution network, including the personal electric shock risk indicator λ es , Outage risk index λ t , Overvoltage risk index λ ov ;

[0041] Step 3. For personal electric shock risk index λ es , combined with the personal electric shock risk severity function, the structural characteristics of the medium and low voltage distribution network, the situation of the power supply area, the relay protectio...

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Abstract

The invention discloses a risk theory-based medium and lower voltage distribution network neutral point grounding mode decision-making method. The method comprises the following steps of 1, collectingmedium and lower voltage distribution network structural characteristic and power supply region data, relay protection parameters and single-phase fault data, overvoltage statistical data, power-downtime and data information of number of households in power down; 2, calculating human body electric shock risk index <Lambda><es>; 3, calculating power down risk index <Lambda><t>; 4, calculating overvoltage risk index <Lambda><ov>; 5, calculating a power distribution system comprehensive risk index R<s> according to the human body electric shock risk index <Lambda><es>, the g power down risk index <Lambda><t> and the overvoltage risk index <Lambda><ov>; and 6, obtaining the comprehensive risk of the neutral point grounding mode according to the power distribution system comprehensive risk index R<s>. By virtue of the method, the technical problem that decision making for the medium and lower voltage distribution network neutral point grounding mode specific to the human body electric shock risk is absent in the prior art is solved.

Description

technical field [0001] The invention belongs to the field of electric power system planning and design, and in particular relates to a decision-making method for neutral point grounding mode of medium and low voltage distribution network based on risk theory. Background technique [0002] With the continuous development of my country's medium and low voltage power distribution network, its system topology is becoming more and more complex, and the system scale is becoming larger and larger, which brings great challenges to the safe and stable operation of the system. The neutral point grounding method of medium and low voltage systems directly affects the system operation mode, equipment insulation level and reliability. For example, the neutral point is grounded through the arc suppression coil and the ungrounded system is allowed to operate with a fault for 1 to 2 hours, and its reliability is high, but the arc overvoltage is high; the zero-sequence protection in the small...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 吴金勇熊小伏丁健欧阳金鑫郝越峰龙毅徐修远马格土张薇薇杨明波朱宁
Owner GUIZHOU POWER GRID CO LTD
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