Shanghai BAO Steel

Active Harmonic Filter & Static Var Generator

The Industry

Reduced harmonic levels results in improved electrical network reliability and reduced operating costs. Nuisance tripping of protective devices and nuisance clearing of fuses due to harmonic heating effects is greatly reduced.

Compared with the traditional capacitor bank, YTPQC-SVG Static Var Generator has the advantages of fast response and high compensation accuracy without under-compensation or over-compensation problems, avoid reasonance,etc.

Background

The development of modern industry increases the demand for metals, making the metallurgical industry develop rapidly.The electrical equipment of metallurgical enterprises has the characteristics of large capacity, most of the perceptual load, large load impact and braking speed, high degree of automation, work continuity and so on.

Power Quality Problem

Medium-frequency furnace is widely used in the metallurgical industry, mainly used in the smelting of non-ferrous metals and ferrous metals.The working frequency of medium frequency furnace is between 50~20000 Hz, which has the advantages of high thermal efficiency, short melting time, less burn loss of alloy elements, wide melting materials, less pollution to the environment, and can accurately control the temperature and composition of metal liquid.However, in the use of medium frequency furnace, it will produce a large number of harmonics, resulting in serious harmonic pollution in the power grid, causing great harm to the whole power system.

Solution

According to the field situation, we configure 500A Active Harmonic Filter and 250kVAr Static Var Generator to address the field power quality problems.

Performance

From the field test data (below figure), after the YTPQC-AHF and YTPQC-SVG, the field power quality problem is well solved, the current waveform from zigzag wave to sine wave, the harmonic current distortion rate from 61.3% to 3.5%, and the system power factor from 0.67 to 0.99.