Improving the PQ Harmonic Detection Method for Active Power Filters in Single-Phase Power Systems
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Abstract
This study presents a novel improvement to the instantaneous power theory (PQ) for harmonic detection in active power filters (APFs) applied to single-phase power systems. The method is designed to eliminate harmonic currents and improve the power factor for nonlinear loads. The key contribution of this research is the development of the PQ-based harmonic detection method that significantly reduces computation time and supports electrical systems with distorted voltage sources while preserving the filter’s performance. The proposed method was verified through real-time simulation with the OPAL-RT hardware. Test results indicate that the percentage of the total harmonic distortion of source current (%THDi) was reduced from 18.11% (before compensation) to 0.16% after applying the improved PQ methods. This value is lower than the traditional PQ method and complies with IEEE standard 519-2022. Moreover, the power factor was also improved to a unity after the compensation. In addition, the improved PQ method provided computation time reduction up to 42.76% compared to the combined PQ method. The improved PQ method achieved these results with lower computational complexity, making it a practical and reliable solution for implementation in microcontroller-based real-time control systems while optimizing the resources of the high-performance microcontroller, underscoring its suitability for resource-constrained embedded systems in practical APF applications.
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