Simulink Model of Active Power Filter Based on Instantaneous Reactive Power Theory

In power systems, the presence of power supply harmonics and reactive currents can cause numerous issues for electrical equipment. To address this problem, researchers have developed Simulink models for active power filters based on instantaneous reactive power theory. These models utilize advanced control algorithms, typically implemented through PI controllers and coordinate transformation blocks (abc/dq transformation), to regulate the active power filter's output current. By generating compensating currents that cancel out harmonic components, the system effectively filters power supply harmonics and reactive currents, thereby ensuring power system stability and reliability. Through simulation and experimental validation, researchers have confirmed that this Simulink model not only efficiently eliminates harmonics and reactive currents but also achieves high filtering accuracy with relatively low implementation costs. The model's core functionality often includes harmonic detection modules using instantaneous power theory calculations and PWM signal generation for inverter control, making it highly suitable for widespread application in modern power systems.