Consumed Lifetime Estimation of DFIG Power Converter with Constructed High-Resolution Mission Profile

A high-resolution wind speed mission profile is constructed from the hourly data by using a von Karman's spectra-based method, and six constructed mission profiles with different turbulence intensities and length scales are studied. On the basis of wind speed and temperature mission profile, the consumed lifetime of the power converter in a doubly-fed induction generator-based system can be estimated by the Direct Method and the Indirect Method, where the Direct Method directly estimates the consumed lifetime by the one-second mission profile, while the Indirect Method calculates the consumed lifetime from two parts. One is based on the one-hour mission profile, and the other is calculated by the wind speed distribution and rainflow counting results of each mean wind speed. The results show that the consumed lifetime calculated by the Direct Method and the Indirect Method are the same, where the IGBT of the grid-side converter and the diode of the rotor-side converter are the fragile components. Furthermore, compared with the sampled mission profile, the constructed one leads to a higher lifetime.