DC-Link Current Ripple Component RMS Value Estimation Considering Anti-Parallel Diode Reverse Recovery in Voltage Source Inverters

To estimate the RMS value of the DC-link ripple current more accurately, a method is developed considering the reverse recovery of the anti-parallel diode in voltage source inverters (VSIs). In this paper, using the analysis of the inverter DC-link current and anti-parallel diode reverse recovery, calculations are implemented based on the SPWM technique. According to the calculations and simulation and experimental results, it is shown that the calculated ripple current RMS values are higher and closer to the actual values when the diode reverse recovery is considered. In addition, inverter switching frequency also influences this value. Comparing with the experimental results, the error of the DC-link ripple current RMS value estimated by the proposed method vary under different inverter operating conditions and are between 0.1% and 10.5%.