1.Background

At present, the problem of harmonics in the power grid is attracting more and more attention. In the power system, harmonics is a very important indicator of power quality. The extensive use of power electronic devices makes the harmonic content in the grid of frequency converters, inverters, rectifiers, etc., increasing, and their operation leads to a large harmonic component due to their own nonlinear characteristics. Certain loads in steel production such as electric arc furnaces and rolling mills generate large amounts of harmonics during operation and have become the main source of harmonics in the grid.

2.Concern

At present, the problem of harmonics in the power grid is attracting more and more attention. In the power system, harmonics is a very important indicator of power quality. The extensive use of power electronic devices makes the harmonic content in the grid of frequency converters, inverters, rectifiers, etc., increasing, and their operation leads to a large harmonic component due to their own nonlinear characteristics. Certain loads in steel production such as electric arc furnaces and rolling mills generate large amounts of harmonics during operation and have become the main source of harmonics in the grid.

3.Solution

FGI high voltage static var generator (SVG) can detect and control harmonics in power grid. SVG detects the harmonic frequency of the power grid, and sends out the reverse harmonic with the same frequency through the control algorithm to achieve the effect of fast tracking and controlling harmonics.

The site is a steel rolling plant in Fujian Province. There are many rolling mills with different power.

After testing, it was found that the harmonic content of the unit had exceeded the specified limit, which was also very dangerous to the safety of other units and needed to be dealt with urgently.FGI installed an Static Var Generator on the 10 kV side according to the actual operating conditions to monitor and deal with the harmonics of the power grid in real time.

4.product advantages

(1) Static var generator Provides harmonic control functions

SVG equipment can control harmonics below 25 times to protect the safety of electrical equipment.

(2) Static var generator provides excellent high-low voltage crossing function

The high and low voltage crossing range and duration and other indicators are higher than the national standard, which can maintain the equipment in the case of power grid voltage sudden drop or sudden rise, and does not expand the accident.

(3) Static var generator provides high response speed and accurate compensation

The response time of SVG is less than 5ms, which can react quickly to power grid fluctuations, adjust power in time, and reduce fluctuations.