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Application of 120MVar high power RSVG in EAF - Overseas steel plant

In March 2019, the company signed a commercial contract with an overseas steel plant to provide a complete set of power quality solutions for 130T electric arc furnace and supporting refining furnace. The top feeding mode is adopted by the on-site electric arc furnace. The capacity of the furnace transformer is 105MVA, and the grid access point is 35kV. 35kV busbar is supplied by 220kV/35kV special transformer with 160MVA capacity through short distance transmission line.

With data analysis and technical specifications confirmation, our company adopts 35kV/120MVar delta-connection cascade SVG device combined with FC fixed compensation equipment to comprehensively control the reactive power, harmonic, voltage imbalance, grid voltage fluctuation and flicker and other power quality problems in the smelting process of on-site electric arc furnace.

35kV/ 120MVar delta-connection cascade SVG device of the project is an outdoor container structure, including six power unit containers and one control and water-cooling system container. The power valve bank uses water-water cooling system which can provide good heat dissipation conditions for the power valve banksand ensure the safe and stable operation of the equipment.

The innovation of the project is as follows:

The power unit is highly modulized, easy to disassemble and assemble, and it can be directly replaced with the backup power unit when necessary, which is convenient for repair and maintenance.

Online bypass function, SVG device can automatically bypass the fault power unit online in case of operation failure, and the equipment can operate continuously and stably, effectively ensuring the stability and reliability of operation.

After the completion of the equipment assembly, SVG will go through strict factory test process, including appearance inspection, electrical safety test, protection performance test, high voltage operation test, full load continuous operation test, dynamic response performance test, etc., effectively ensure the stable operation and dynamic response ability of the equipment.

The human-machine interface is friendly and powerful. It has many functions, such as operation data recording, automatic fault recording, equipment event alarm and recording, and various external communication interfaces. They can effectively assist operators to solve various technical problems in operation and maintenance.

The equipment has successfully passed the type test of power industry electrical equipment quality inspection and testing center (Wuhan High Voltage Research Institute) and factory acceptance test, and has good electrical , safety and reliability performance.