A Construction Method of Ultra High Power Electric Arc Furnace Model

Abstract

The present invention relates to a method for constructing an ultra-high-power electric arc furnace model, comprising the following steps: step S1: establishing a power balance equation of the ultra-high-power electric arc furnace according to the law of energy conservation; step S2: according to the power balance of the ultra-high-power electric arc furnace Equation, construct the deterministic arc model of the electric arc furnace; Step S3: adopt the low-frequency chaotic signal generated based on the asymmetric nonlinear resistance Chua's circuit to modulate the static arc voltage, and construct the uncertainty model reflecting the randomness of the electric arc furnace load operation; Step S4: According to the deterministic arc model of the electric arc furnace and the uncertainty model reflecting the randomness of the electric arc furnace load operation, a new AC electric arc furnace simulation model for the study of low-frequency non-stationary interharmonics is constructed. The invention can accurately reflect the operation characteristics of the ultra-high-power electric arc furnace in actual industrial use, reveal the emission characteristics of the low-frequency non-stationary interharmonics of the ultra-high-power electric arc furnace, and reflect the stability of the distribution network when the ultra-high-power electric arc furnace equipment is running. sexual influence.

Description

technical field [0001] The invention relates to the research field of ultra-high-power electric arc furnaces, in particular to a method for constructing an ultra-high-power electric arc furnace model for low-frequency non-stationary interharmonic research. Background technique [0002] With the rapid development of modern arc smelting and ultra-high-power power supply technology, ultra-high-power electric arc furnaces have been more and more widely used in the metallurgical industry. Although the application of ultra-high power electric arc furnace can shorten melting time, improve production efficiency, reduce energy loss and save production costs, the impact of non-stationary interharmonics and high-power shocks generated by such loads on the power quality of distribution network is becoming more and more serious. . For example, when a user of an ultra-high-power electric arc furnace (100-ton electric arc furnace) is in production, it will not only cause damage to the equ...

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Problems solved by technology

Although the application of ultra-high power electric arc furnace can shorten the melting time, improve production efficiency, reduce energy loss, and save production costs, the impact of non-stationary interharmonics and high-power impacts generated by such loads on the power quality of distribution networks is becoming more and more serious.

For example, when an ultra-high-power electric arc furnace user (100-ton electric arc furnace) is in production, it will not only cause damage to the equipment of the precision casting company connected to the same 35kV busbar, but also cause problems such as stator vibration and local heating abnormalities in the generator of the power generation company, and will also cause As a result, multiple sets of protections in the connected 110kV substation are frequently activated, and the main transformer generates serious noise when it is under load.

[0003] At present, there are few researches and analyzes on the low-frequency non-stationary interharmonic emission characteristics of ultra-high power arc equipment at home and abroad. Some experts and scholars at home and abroad have focused on the electric arc furnace model, inter The interaction mechanism of fluctuations has been studied and analyzed, most of which start from the randomness of the arc and establish relevant models of electric arc furnaces based on stochastic theory or chaos theory. However, the existing electric arc furnace models are basically only suitable for the study of voltage fluctuations. The research on the low-frequency non-stationary inter-harmonic emission characteristics of ultra-high-power arc equipment is yet to be discussed, and the existing models are difficult to reflect the impact of arc equipment on the stable operation of the distribution network, and do not reveal typical non-stationary inter-harmonic interference sources Emission Characteristics and Its Influencing Factors

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