Iron loss calculation of AC filter inductor for three-phase PWM inverter

Two methods are proposed for evaluating the iron loss of an AC filter inductor used in a pulse-width modulation (PWM) inverter. The first method uses a loss map and calculates the iron loss without using a real PWM inverter, and the second method uses an iron loss analyzer (ILA), which can measure the iron loss during each switching period of a real PWM inverter. The authors compared the results of each method for both single-phase and three-phase PWM inverters. The calculated iron loss on the three-phase PWM inverter has a relatively large error under certain PWM pulse conditions. In order to reduce this error, a modified method is proposed, and it is shown to have a calculation error of less than 2%.