Electromechanical transient simulation modeling method and system based on arrester

Abstract

The invention provides an electromechanical transient simulation modeling method and system based on an arrester. The method comprises the steps that according to a preset arrester basic constraint equation, the arrester is used to calculate an instantaneous current at a simulation time point under an instantaneous voltage at the time point; according to the instantaneous voltage and the instantaneous current, instantaneous power and instantaneous resistance at the time point are calculated; according to the instantaneous voltage, the instantaneous current, the instantaneous power and the instantaneous resistance, a resistance value of the arrester in a simulation time period is calculated; and according to the resistance value, electromechanical transient simulation modeling is performed.Through the modeling method and system, the function of the arrester can be approximately simulated in electromechanical transient simulation, and therefore the electromechanical transient simulationprecision of a power transmission system is improved.

Description

technical field [0001] The invention belongs to the technical field of UHV half-wavelength power transmission system construction, and in particular relates to an electromechanical transient simulation modeling method and system based on an arrester. Background technique [0002] Half-wavelength AC power transmission refers to an ultra-long-distance three-phase AC power transmission method in which the line electrical distance is close to a power frequency half-wave. Operating overvoltage is one of the indicators that determine the insulation level of power transmission and transformation equipment, and it is also a key technical problem that needs to be solved urgently in half-wavelength power transmission. Effective measures must be taken to suppress the operating overvoltage within a certain range. Foreign scholars have conducted many computational studies on the operating overvoltage of half-wavelength AC transmission lines. The following conclusions are obtained: the h...

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Problems solved by technology

The operation of the MOV arrester is disturbed by the surrounding environment, such as surface pollution, internal moisture, etc., will change its volt-ampere characteristics, which will increase the leakage current of the arrester a lot, and its impact is more serious than overvoltage

[0006] The simulation method of MOV arrester will directly affect the results of electromechanical transient simulation. At present, there is no good simulation method of MOV arrester that comprehensively considers long-term working voltage, impulse voltage and environmental factors.

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