The working principle of active filters

Release time:

2023-09-03

Active filter is a new type of harmonic suppression specialized equipment made using modern power electronics technology and digital signal processing technology based on high-speed DSP devices. It consists of two main parts: the instruction current operation circuit and the compensation current generation circuit. The instruction current operation circuit monitors the current in the circuit in real time, converts the analog current signal into a digital signal, and sends it to a high-speed digital signal processor (DSP) for processing. The harmonic and fundamental waves are separated, and a driving pulse is sent to the compensation current generation circuit in the form of a pulse width modulation signal, driving the IGBT or IPM power module to generate compensation current with the same amplitude and opposite polarity as the grid harmonic current and injecting it into the power grid, Compensate or cancel harmonic currents and actively eliminate power harmonics.

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