Active Harmonic Filter in Metro, Railway
By the end of 2020, China had a total of 146,000 kilometers of railways in operation and 37,900 kilometers in operation, ranking first in the world.High-speed rail traction transformer generally adopts 12 or 24 pulse rectification, will produce 11th and 13th order harmonics; distribution transformer load mainly includes frequency converter, UPS, elevator, lighting, 3rd,5th,7th,11th and 13th order harmonics.
The Industry
Because the transportation power grid system contains a large number of non-linear equipment, the equipment will produce a large number of harmonics. When the harmonic content of the power grid is high, it will cause certain harm to the transportation power and lighting system.
The PQ Problem
Transportation power distribution system is mainly 3rd, 5th, 7th, 11th, 13th order harmonics, which has great harm to the power system, and needs to use active power filter for governance.The active filter device adopts advanced power electronics technology to detect the harmonics in the grid in real time, generate the reverse phase compensation current through the converter, and dynamically filter out the harmonics in the grid.
The Solution YTPQC-AHF
Due to the large harmonics on the Shanghai subway line, in order to ensure the normal operation of the capacitor in the on-site reactive power compensation cabinet, a 100A active harmonic filter is installed on the site to control the harmonics.After treatment, the field harmonic problem has been well improved, and the current distortion rate is reduced from about 16% to about 3%.
The Technical Performance
The Picture
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