Abstract

Power electronics-based loads significantly degrade power quality due to their nonlinear characteristics. These loads introduce harmonics in the system and lower the power factor, leading to increased reactive power demand and energy billing. Harmonic power filters are employed to mitigate the power quality issues in the supply system. Hybrid power filters, which combines the advantages of both active and passive approaches, offer enhanced performance. The voltage source inverter is the core component of the active filter. In this work, a modified five level inverter topology with fewer switches is implemented for the active part of the filter, while the passive filter is tuned to third order harmonic to reduce the active filter rating and to take benefits of multilevel inverters. Active filter control is the critical part of the APF operation. Here to take advantage of artificial intelligence techniques, a fuzzy controller is implemented for DC voltage regulation. The reactive power (p-q) theory is applied for harmonic extraction, and the PWM technique is adopted for pulse generation with multicarrier signals. The proposed system is developed using the MATLAB / Simulink platform. The results are satisfactory and meet the IEEE std for harmonic limits.

Keywords

Power Quality, Harmonics, Multilevel Inverter, Total Harmonic Distortion, Harmonic Filter,

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References

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