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Active Harmonic Filter (AHF) is used to improve power quality, by harmonics filtering, reactive power compensation and 3 phase balancing in power systems. Harmonics are voltage or current waveforms that are integer multiples of the fundamental frequency. They can cause various power quality issues, including increased neutral current in three-phase electrical power systems. AHF can significantly impact neutral current, especially in systems with non-linear loads or single phase loads.
In a balanced three-phase system without harmonics (linear load), the sum of the currents in the three phases cancels out, resulting in no neutral current. However, several factors can cause neutral current to flow, including:
Active Harmonic Filter works by continuously monitoring the current waveform and injecting compensating currents to cancel out the harmonics. The process involves:
Reduction of Third Harmonics:
Balancing Loads:
Improved Power Quality:
Reduced Neutral Current:
Enhanced System Reliability:
Compliance with Standards:
Without AHF:
With AHF:
Thus, the total neutral current is reduced to near zero, assuming perfect compensation.
Active Harmonic Filters (AHF) play a crucial role in reducing neutral current in three-phase systems by harmonic correction or significantly reducing total harmonics distortion, particularly the third harmonics in nonlinear load.
Meanwhile,Same as Static Var Generator, Active filter is the best power factor correction product with fast response, can By improving power quality and ensuring balanced loads, AHFs enhance the efficiency, safety, and reliability of electrical systems.
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