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Power Quality Improvement by Suppression of Current Harmonics Using Hysteresis Controller Technique

Author(s): Prof. Aziz Ahmed, | Vinod Kumar, | Aasha Chauhan, | Bharti Thakur,

Journal: International Journal of Recent Technology and Engineering
ISSN 2277-3878

Volume: 2;
Issue: 2;
Start page: 186;
Date: 2013;
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Keywords: Hysteresis Current control | Instantaneous power (p–q) theory | PI Controller | Shunt Active Power Filter.

Recently wide spread of power electronic equipment has caused an increase of the harmonic disturbances in the power systems. The nonlinear loads draw harmonic and reactive power components of current from ac mains. Current harmonics generated by nonlinear loads such as adjustable speed drives, static power supplies and UPS. Thus a perfect compensator is required to avoid the consequences due to harmonics. To overcome problems due to harmonics Shunt Active Power Filter (SAPF) has been considered extensively. SAPF has better harmonic compensation than the other approaches used for solving the harmonic related problems. The performance of the SAPF depends upon different control strategies. This paper presents the performance analysis of SAPF under most important control strategy namely instantaneous real active and reactive power method (p-q) for extracting reference currents of shunt active filters under unbalanced load condition. Detailed simulations have been carried out considering this control strategy and adequate results were presented. These simulation results validate the significance of instantaneous real active and reactive power (p-q) control strategy in achieving an effective harmonic compensation under unbalanced load conditions. In this paper, harmonic control strategy is applied to compensate the current harmonics in the system. A detailed study about the harmonic control method has been used using shunt active filter technique.
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