Short net side low voltage dynamic reactive power compensation system in metallurgical industry

Abstract

The present invention relates to a short net side low voltage dynamic reactive power compensation system in the metallurgical industry. Defects of low furnace transformation efficiency, oversized reactive power compensation and comparatively serious three-phase unbalance caused by a low equipment natural power factor in a power supply system in the present metallurgical industry are solved. The system comprises a high voltage power supply network system, a short net system which is in series connection with the high voltage power supply network system, and metallurgical equipment which is in series connection with the short net system. The metallurgical equipment is in parallel connection with a low voltage dynamic compensation device. Both the short net system and the metallurgical equipment are in parallel connection with a furnace transformation system. A high voltage side of the furnace transformation system is connected to the high voltage power supply network system. The metallurgical equipment and the low voltage dynamic compensation device are connected in series. A large amount of reactive current directly passes through a loop formed by a low voltage capacitor and the metallurgical equipment, without passing through the short net system, the furnace transformation system and the high voltage power supply network system, while improving the power factor, active output rate of furnace transformation can be improved, and the reactive power consumption of furnace transformation and the short net can be reduced.

Description

technical field [0001] The invention relates to the field of low-voltage reactive power compensation, in particular to a low-voltage dynamic reactive power compensation system on the short-network side of the metallurgical industry for improving the power factor of the power supply system in the metallurgical industry. Background technique [0002] The metallurgical industry refers to the exploration, mining, selection, smelting, and rolling of metal minerals, including ferrous metallurgical industry and nonferrous metallurgical industry. It is an important raw material industry sector and provides metal for various sectors of the national economy. Materials are also the material basis of economic development. However, its power consumption is very large, accounting for about 70% of the production cost of the enterprise. Therefore, it is very important for metallurgical enterprises to reduce power consumption and improve the overall efficiency of smelting electric furnaces. ...

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Problems solved by technology

[0005] The invention solves the defects of the low natural power factor of equipment in the power supply system of the existing metallurgical industry, which leads to low furnace conversion efficiency, excessive reactive power consumption and serious three-phase imbalance, and provides a low-voltage dynamic reactive power system on the short network side of the metallurgical industry. Compensation system, improve the natural power factor of the equipment, improve the efficiency of the furnace, reduce the reactive power consumption, and also stabilize the three-phase imbalance

[0006] The invention also solves the defects in the prior art that cause the voltage and current waveform distortion of the smelting system, increases the line loss and furnace transformer loss, and reduces the power quality, and provides a low-voltage dynamic reactive power compensation system on the short network side of the metallurgical industry to prevent the smelting system from Distortion of voltage and current waveforms, reducing line loss and furnace transformation loss to improve power quality

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