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Dynamic arc model construction method considering random change 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: 2020-02-28
KUNMING UNIV OF SCI & TECH
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  • Description
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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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  • Dynamic arc model construction method considering random change of arc length
  • Dynamic arc model construction method considering random change of arc length
  • Dynamic arc model construction method considering random change of arc length

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Experimental program
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Embodiment 1

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

[0025] Step 1, establish a random variable 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 moment when the arc fault is connected; △L(t) represents the random change value of the arc length when the time is t; i(t) is the arc current at time t; T is the time when the arc fault occurs; Δt is the simulation step length; when t<T, L(t)=0.

[0028] In 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 arc dynamic conductance at time t+Δt; τ c is the time constant; G is the steady-state conductance of the arc; β is a constant; I c is th...

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Abstract

The invention discloses a dynamic arc model construction method considering a random range of an arc length, and belongs to the field of power system fault detection and protection. A dynamic arc model is established by randomly changing the arc length and combining a control theory arc model. According to the dynamic arc model constructed by the invention, the random change of the arc length is considered; simulation waveforms generated by the model used for simulation can show that arc voltage and arc current change in different power frequency periods, volt-ampere characteristic curves of the arc voltage and the arc current do not completely coincide, and therefore the difference between the arc voltage and the arc current and actual waveforms is smaller than that of some traditional methods, and effectiveness of model construction of the method is shown.

Description

technical field [0001] The invention relates to a method for constructing a dynamic arc model considering random changes in arc length, and belongs to the field of fault detection and protection of electric power systems. Background technique [0002] In my country, the 10kV distribution network adopts a small current grounding method, and when a single-phase ground fault occurs according to the regulations, it is allowed to run for 1 to 2 hours, and the fault lasts for a long time. However, with the increase of system capacitive current, the short-circuit current increases, and the failure rate of single-phase ground fault is extremely high, which has a greater impact on the system, especially the arc-ground fault which accounts 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, the modeling and analysis of arc fault plays an extremely importa...

Claims

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Application Information

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Patent Type & Authority Applications(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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