HCC Based Hybrid Shunt Active Filter to Reduce the Harmonics Due to Switching Surges
Nøgleord:
Hysteresis Current Control [HCC], Active Power Filter [APF], Distributed Generators [DG], Distribution Systems [DS], shunt active filters, Voltage Regulation [VR], Total Harmonic Distortion [THD]Resumé
This paper deals with the hysteresis current control based hybrid shunt active filter to reduce the harmonics produced by frequent switching of industrial loads in distribution system. The main harmonic sources of distribution lines are the non linear loads and frequent switching of industrial loads. The harmonics due to non linear loads can be controlled by passive filters. The switching surges are dynamic and its magnitude dies out quickly. Hence the harmonics due to these phenomena requires an attention. The switching of loads produces voltage sag and swells which leads to harmonics in the lines. The proposed dampening system is fully characterized by series L, shunt C and shunt DC link connected through 3-phase active filter. The disturbances in the supply voltage and load current due to the switching surges are observed in the simulation. The same is studied after connecting the designed active filter to the line. The simulation results obtained from the proposed method proves that it gives comparatively better THD value.
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