1.Background

China is the world's largest steel producer with a huge production scale and a strong industrial base, which is the basic industry and pillar industry of the national economy. The green and healthy development of the steel industry is of great significance to the development of the national economy, and iron and steel smelting is one of the important working conditions. Due to the load characteristics of steel smelting, there will be some prominent power quality problems, mainly including the following aspects:

(1) harmonic problem

Power electronic equipment widely used in steel production, such as frequency converters, rectifiers, etc., will generate harmonic current into the power grid during the working process.

Electric arc furnace, refining furnace and other steelmaking equipment will produce a lot of harmonics due to the nonlinear characteristics of the arc. Especially in the melting period of electric arc furnace, the current changes dramatically and the harmonic content is very high.

(2) Voltage fluctuation and flicker problem

The frequent start and stop of large equipment, which requires large current when starting up, will cause the grid voltage to drop instantaneously; And when it stops, it will make the grid voltage rise instantaneously.

In the working process of steel making equipment such as electric arc furnace, the instability of electric arc will lead to current fluctuation, and then cause voltage fluctuation and flicker of power grid.

(3) Three-phase unbalance problem

In steel production, the three-phase characteristics of some production equipment are inconsistent, which will cause three-phase imbalance.

These power quality problems can increase the heat of electrical equipment, reduce the service life of equipment, and interfere with communication systems and automated control systems. Harmonics will produce noise in the communication line and affect the quality of signal transmission. Increased transformer and line losses.

In order to solve the power quality problem, reactive power compensation device needs to be installed. Static var generator (SVG) is the best scheme in the field of power quality management. Compared with other power quality control devices, SVG has the advantages of fast response speed, diverse compensation modes, and accurate compensation, and is favored by more users.

2.FGI scheme

There are many electric arc furnaces and refining furnaces installed in a steel manufacturing enterprise in Northwest China. The field reactive power fluctuates greatly, flicker and harmonic problems are serious, and power quality problems have a serious impact on production activities.

In order to solve the on-site problems, FGI technicians understood the on-site conditions in detail, tested the power quality of each section of the line, combined with the operation conditions and test data, and configured a reasonable and efficient compensation scheme for the site. The equipment still runs stably for many years after operation, which is also the earliest application of SVG in electric arc furnace load in China. It has accumulated valuable experience for SVG to deal with power quality problems in steel industry.

Recently, the site upgraded the production line and expanded production, and the reactive power demand changed. In response to the needs of users, FGI redesigned the site according to the load conditions, and configured a comprehensive power quality solution based on SVG for the site to meet the requirements of site use.

FGISVG has been running stably on site for many years and has accumulated a good reputation among users, making users choose FGI brand products many times.

 3.FGI product superiority

FGISVG equipment has excellent functional performance and can provide effective treatment for steel smelting industry where power quality problems are prominent.

It can control the harmonics and three-phase unbalance caused by electric arc furnace in operation.
Stable voltage to avoid the failure of other equipment due to violent voltage fluctuations.
Improve the power factor of the site to avoid fines.

FGI has focused on product development for many years, and its series of products have won the single champion title of the manufacturing industry of the Ministry of Industry and Information Technology. It has accumulated a lot of application experience and good customer reputation in the field of power quality management, and is widely used in new energy power generation, coal mining, petroleum, metallurgy and other industries to provide customers with professional power quality management solutions.