APF Simulation Waveforms Based on IP-IQ Instantaneous Power Theory

The application of IP-IQ instantaneous power theory in Active Power Filters (APF) represents an advanced control strategy primarily used for harmonic suppression and reactive power compensation. This theory transforms three-phase voltages and currents into the α-β coordinate system through Clark transformation, then decomposes them into active power components (IP) and reactive power components (IQ) using power calculation algorithms. This enables precise harmonic detection and compensation through current reference generation.

In simulation waveforms, one can observe voltage and current waveforms in a three-phase three-wire system, along with the compensated current waveforms after APF intervention. By comparing pre- and post-compensation waveforms, the elimination of harmonic components becomes clearly visible. The IP-IQ theory's advantage lies in its fast dynamic response, making it suitable for harmonic compensation under various nonlinear load conditions. The implementation typically involves real-time calculation of instantaneous power components using mathematical operations like cross-products and low-pass filters for fundamental component extraction.

When required, the analysis can be extended to three-phase four-wire system simulations to further examine zero-sequence component handling, which is particularly important for harmonic suppression under unbalanced load conditions. This theory finds widespread application in practical engineering projects, and the presentation of simulation waveforms helps deepen understanding of its working principles and effectiveness. Code implementation would typically involve coordinate transformation functions, power component calculators, and PWM signal generators for inverter control.