Method and system for arc furnace load modeling and parameter identification

Abstract

The invention discloses a method and a system for arc furnace load modeling and parameter identification. The method includes: building an arc furnace three-phase equivalent resistance initial model which comprehensively reflects harmonic waves, flicker and three-phase imbalance characteristics of a real arc furnace and contains to-be-identified parameters for comprehensively reflecting harmonic waves, flicker and three-phase imbalance characteristics of the real arc furnace; obtaining discretized actually measured three-phase voltage value and discretized actually measured three-phase current value; optimizing the arc furnace three-phase equivalent resistance initial model by using the discretized actually measured three-phase voltage value, the discretized actually measured three-phase current value and optimization algorithm to obtain the optimal value of the to-be-identified parameters; and substituting the to-be-identified parameters in the arc furnace three-phase equivalent resistance initial model to obtain an arc furnace three-phase equivalent resistance model. The arc furnace three-phase model built according to an embodiment of the method and the system can reflect actual conditions of an arc furnace operating in power gird more actually.

Description

technical field [0001] The invention belongs to the field of power quality analysis, in particular to a method and system for modeling and parameter identification of an electric arc furnace load. Background technique [0002] With the extensive use of various nonlinear load devices in the power system, the interference of these load devices on the power grid is also increasing. Electric arc furnace is a typical nonlinear load equipment in power system, its pollution and harm to power quality include three-phase power imbalance, voltage fluctuation and flicker, and harmonics. [0003] Although the influence of electric arc furnaces on power quality can be analyzed through actual measurement methods, the huge measured values ​​are not easy to store and have no scalability, which is not conducive to relevant theoretical analysis and simulation research (such as the simulation of the influence of electric arc furnaces on the entire power system Research, or the simulation of t...

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Problems solved by technology

[0009] In view of this, the purpose of the embodiments of the present invention is to provide a method and system for modeling and parameter identification of electric arc furnace load to obtain an electric arc furnace model, so as to solve the problem of large deviation between the existing electric arc furnace model and the physical electric arc furnace

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