The four major brands of active filters are Nokia, ABB, Honeywell and SFERE.
1. Nokia
Nokia’s MaxSine active filter is based on patented direct phase current control technology, which can provide efficient and fast harmonic reduction and reactive power to the power grid. compensate.
2. ABB
ABB's active filtering filters out harmonics appearing in the power supply system in a controllable and dynamic way.
3. Honeywell
SmartWave series active power filters are a truly effective harmonic control solution, using the most advanced active harmonic compensation technology. Eliminate grid harmonics.
4. SFERE
The SFR-APF series active filter module is a new type of power electronic device used to dynamically filter harmonics and compensate for reactive power. It can (both size and frequency change) and dynamic reactive power are filtered and compensated in real time to overcome the shortcomings of traditional harmonic suppression and reactive power compensation methods such as traditional filters, and realize the harmonic filtering function and reactive power of the system The compensation function is widely used in power metallurgy, petroleum, ports, chemical industry, industrial and mining enterprises, etc.
Introduction to active filters
Active power filters are a new type of power harmonic control made using modern power electronics technology and digital signal processing technology based on high-speed DSP devices. equipment. It consists of two main parts: the command current calculation circuit and the compensation current generation circuit. The command current operation circuit monitors the current in the line in real time, converts the analog current signal into a digital signal, and sends it to a high-speed digital signal processor for signal processing.
Separate harmonics from fundamental waves, and send driving pulses to the compensation current generating circuit in the form of pulse width modulation signals to drive IGBT or IPM power modules to generate harmonic currents with the same amplitude and polarity as the power grid. The opposite compensation current is injected into the power grid to compensate or offset the harmonic current and actively eliminate power harmonics.
Active power filters can be widely used in distribution networks of industry, commerce and institutions, such as: power systems, electrolytic plating companies, water treatment equipment, petrochemical companies, large shopping malls and office buildings, Precision electronics companies, airport/port power supply systems, medical institutions, etc.
Reference for the above content: Baidu Encyclopedia-Finland Nokia Capacitor Co., Ltd.