SPLTRAK Abstract Submission
Inverter Reliability Estimation for Advanced Inverter Functionality
Jack D Flicker1, Jay Johnson1, Matthew J Reno1, Joseph A Azzolini1, Peter Hacke2, Ramanathan Thiagarajan2
1Sandia National Laboratories, Albuquerque, NM, United States
/2National Renewable Energy Laboratory, Golden, CO, United States

In the near future, grid operators are expected to regularly use advanced distributed energy resource (DER) functions, defined in IEEE 1547-2018, to perform a range of grid-support operations.  Many of these functions adjust the active and reactive power of the device through commanded or autonomous modes, which will produce new stresses on the power electronics components. In previous work, multiple DER devices were instrumented to evaluate additional component stress under multiple reactive power setpoints.  We have utilized these switch loss measurements, coupled with quasi-static time-series simulations, to determine volt-var mission profile of inverters in an active power system.  Mission profiles and loss estimates are then combined to estimate the reduction of useful life of inverters from different reactive power profiles.  It was found that the average lifetime reduction for an inverter is approximately 0.15% between standard unity power factor operation and the IEEE 1547 default volt-var curve.  For an inverter with an expected 20-year lifetime, the 1547 volt-var curve would reduce the expected life of the device by 12 days.