The four major brands of active filters are Nokia, ABB, Honeywell, and SFERE.
1. Nokia
Nokia's MaxSine-type active filters are based on the patented Direct Phase Current Control technology, which provides highly efficient and fast harmonic reduction and reactive power compensation to the grid.
2. ABB
ABB's active filters are designed to filter out harmonics present in the power supply system in a controlled and dynamic manner.
3, Honeywell
SmartWave series active power filter is a truly effective harmonic management solution, using the most advanced active harmonic compensation technology to dynamically eliminate grid harmonics.
4, SFERE
SFR-APF series active filter module is a new type of power electronic device used for dynamic filtering of harmonics and compensation of reactive power, which can filter and compensate harmonics (size and frequency are changing) and dynamic reactive power in real time, to overcome the shortcomings of traditional harmonic suppression and reactive power compensation methods such as traditional filters and to realize the harmonic filtering function and reactive power compensation function of the system. It is widely used in electric power metallurgy, petroleum, harbor, chemical industry and industrial and mining enterprises.
Active filter
Active power filter is a new type of power harmonic control equipment which is made of modern power electronic technology and digital signal processing technology based on high-speed DSP device. It consists of two main parts: the command current operation circuit and the compensation current generation circuit. The command current operation circuit monitors the current in the line in real time and converts the analog current signal into a digital signal, which is sent to a high-speed digital signal processor for signal processing.
Separate the harmonics from the fundamental wave, and send the driving pulse in the form of pulse width modulation signal to the compensation current generating circuit, drive the IGBT or IPM power module, generate the compensation current with the grid harmonic current amplitude and polarity reversal of the compensation current injected into the grid, the harmonic current compensation or offset, and actively eliminate the power harmonics.
Active power filters can be widely used in industrial, commercial and institutional distribution grids, such as: power systems, electrolytic plating enterprises, water treatment equipment, petrochemical companies, large shopping malls and office buildings, precision electronic enterprises, airports / harbors power supply system, medical institutions.
Reference: Baidu Encyclopedia - Nokia Capacitor Finland Ltd.