A Dynamic Arc Model Construction Method Considering Random Variation of Arc Length

A random change and construction method technology, applied in design optimization/simulation, data processing applications, instruments, etc., can solve problems such as arc hazard identification and treatment

Active Publication Date: 2022-07-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current arc model does not consider this situation, and the arc length is regarded as a constant, and its arc voltage, arc current, and arc resistance remain unchanged in different power frequency cycles, which does not conform to the actual arc combustion situation. There are large differences in waveform characteristics, resulting in certain limitations in arc hazards, identification and treatment

Method used

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  • A Dynamic Arc Model Construction Method Considering Random Variation of Arc Length
  • A Dynamic Arc Model Construction Method Considering Random Variation of Arc Length
  • A Dynamic Arc Model Construction Method Considering Random Variation of Arc Length

Examples

Experimental program
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Embodiment 1

[0024] Example 1: as Figure 1-7 As shown in the figure, a dynamic arc model construction method considering the random variation of arc length, the steps are as follows:

[0025] Step 1, establish a randomly varying arc length by the following formula:

[0026]

[0027] Among them, L(t) represents the length of the random arc length when the time is t, and t is the simulation time; L 0 is the initial arc length at the time of arc fault access; △L(t) represents the random change value of the arc length when the time is t; i(t) is the arc current at the time t; T is the moment when the arc fault occurs; Δt is the simulation step size; when t

[0028] Step 2, the dynamic arc model is established by randomly changing the arc length combined with the cybernetic arc model as follows:

[0029]

[0030] Among them, g(t+Δt) is the dynamic arc conductance when the time is at t+Δt; τ c is the time constant; G is the steady-state arc conductance; β is a constant; I ...

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Abstract

The invention discloses a dynamic arc model construction method considering the random variation of arc length, and belongs to the field of power system fault detection and protection. The invention establishes a dynamic arc model by randomly changing the arc length and combining with the cybernetic arc model. The dynamic arc model constructed by the present invention takes into account the random variation of arc length. It can be seen from the simulation waveform generated by applying the model of the present invention to the simulation that the arc voltage and arc current are changing in different power frequency cycles, and the volt-ampere characteristic curve of the It is not completely coincident, so the difference between it and the actual waveform is narrowed compared with some traditional methods, thus indicating the effectiveness of this method to build a model.

Description

technical field [0001] The invention relates to a dynamic arc model construction method considering the random variation of arc length, and belongs to the field of power system fault detection and protection. Background technique [0002] In my country, the 10kV distribution network adopts the low-current grounding method. According to the regulations, when a single-phase grounding fault occurs, it is allowed to run for 1 to 2 hours, and the fault lasts for a long time. However, with the increase of the system capacitance current, the short-circuit current increases, and the failure rate of single-phase grounding faults is extremely high, which increases the impact on the system, especially the arc-grounding faults, which account for the majority of single-phase faults. The increase of fault current makes it difficult for the arc to extinguish naturally and increases the harm of arc overvoltage [1] Therefore, modeling and analysis of arc faults plays an extremely important ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06Q50/06
CPCG06Q50/06Y02E60/00
Inventor 张广斌段连磊孙勇束洪春
Owner KUNMING UNIV OF SCI & TECH
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