A New Method of Suppressing Electric Arc Furnace Voltage Flicker Based on Corner SVG Device

Abstract

The invention provides a new method for suppressing electric arc furnace voltage flicker based on an angle-connected SVG device. The control part of the SVG device is composed of two fundamental current control loops of the d-axis and the q-axis; the two fundamental current control loops The reference values ​​Id_ref and Iq_ref are formed by the components output by the following four parts: (1) The current reference value Id_ref1 output by the DC side voltage control outer loop; (2) The load current harmonic active component output by the harmonic current detection part Command value Id_har and load current harmonic reactive component command Iq_har; (3) load current active differential component Ip+Ist output by the active proportional differential control part; (4) top grid voltage output by the voltage and average reactive power control part The control component U_PI_Out and the average reactive current component command value Q_PI_Out can quickly, real-time and accurately realize grid voltage flicker suppression, grid voltage unbalance compensation, grid current harmonic compensation, and grid power factor compensation.

Description

technical field [0001] The invention relates to the technical field of SVG devices and controls, in particular to a new method for suppressing electric arc furnace voltage flicker based on angle-connected SVG devices. Background technique [0002] With the development of economy and science and technology, iron and steel smelting technology is also constantly improving. At present, electric arc furnace smelting technology is the most promising smelting technology in the metallurgical industry at home and abroad. Compared with the traditional intermediate frequency furnace and power frequency furnace smelting technology, the electric arc furnace is gaining more and more attention in the metallurgical industry due to its advantages of flexibility, reliability, faster smelting speed, better smelting quality and less investment cost. The wider the application. [0003] In addition, with the continuous advancement of the country's policy of reducing production capacity in the st...

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Problems solved by technology

[0005] In order to reduce the public grid voltage fluctuation and flicker caused by the electric arc furnace production process, the current more traditional compensation method is to use static var compensator (hereinafter referred to as SVC) equipment to compensate the reactive power impact of the electric arc furnace, thereby suppressing the power grid Voltage fluctuation and flicker, but due to the slow response speed of SVC, its compensation effect is not significant. Generally, the flicker suppression ratio before and after compensation is below 2:1

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