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What is difference of Active Harmonic Filter and Active Power Filter?
The principle of an Active Harmonic Filter AHF is to mitigate or eliminate harmonic distortion in electrical power systems. Harmonics are unwanted currents or voltages that deviate from the fundamental frequency of the power system. These harmonics are typically generated by nonlinear loads such as variable frequency drives, computers, rectifiers, and other electronic equipment.
The principle of Active Power Filter APF involves the use of power electronics and control techniques to actively compensate for power quality issues, primarily harmonics and reactive power, in electrical power systems. An APF is designed to mitigate harmonics and correct the power factor in a system to improve the overall power quality.
The main principle of an APF involves generating a current waveform that cancels out the undesired harmonic currents or reactive currents in the system. This is achieved by measuring the problematic currents or voltage harmonics and injecting an opposing current waveform into the system. The injected current waveform is precisely controlled to ensure that the resulting current waveform is as close to sinusoidal as possible.
An Active Harmonic Filter AHF and an Active Power Filter APF are both used to mitigate power quality issues, but they serve different purposes.
In summary, while both AHFs and APFs are used for power quality improvement, AHFs primarily address harmonic distortion, while APFs address multiple issues including harmonic distortion, reactive power, power factor, and voltage fluctuations. The choice between the two depends on the specific power quality issues in the system and the requirements of the application.
Which sites need AHF or APF?
AHF and APF are generally beneficial in sites where there are serious harmonic distortion(High THDi) in electrical system(network). Here are a few examples of sites that may benefit from the installation of AHFor APF:
It is important to note that the need for active filters depends on the specific characteristics of the electrical system and the severity of harmonic distortion. A detailed power quality analysis by a qualified engineer would be necessary to determine the most appropriate solution for a particular site.
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