Real-Time Parameter Determination in Inductors Submitted to Non-Sinusoidal Currents

This paper presents a procedure for the characterization of inductors when operate under combination of low-frequency sinusoidal current (50 or 60 Hz) and high frequency current, up to 20 kHz, produced in the PWM process. These currents are typical on inductors installed between the power converter output and the electric grid in photovoltaic generation plants. This procedure allows the determination of the inductance value, the value of series and parallel resistance associated with the inductor winding, and then, the power losses corresponding to copper and core.