Abstract

Under the more electric aircraft (MEA) theme, many aircraft systems are being electrified. In a previous research work, an electric starter generator system for aircrafts was implemented. This paper presents the reliability of the drive converter – a 3 level neutral point clamped converter (3L-NPC) under an expected mission profile of a short haul aircraft. Wearout failure based reliability of semiconductors and capacitors are considered along with reliability of gate drivers to estimate the overall reliability of the converter.

Highlights

  • Aviation industry is exploring means to cap emissions level at 2020 level and achieve net reduction of 50% in emissions by 2050

  • The simulated stress values due to the expected mission profile is applied in Physics of Failure (PoF) models of lifetime estimation for IGBTs and DC link capacitors

  • Reliability Block Diagram (RBD) method is applied to derive system reliability for the converter from individual component reliability profiles

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Summary

INTRODUCTION

Aviation industry is exploring means to cap emissions level at 2020 level and achieve net reduction of 50% in emissions by 2050. To achieve these goals, electrification of aircraft systems is being pursued [1]. Electrification of aircraft systems is being pursued [1] Such electrified systems would include power electronic converters and their reliability must meet aerospace safety requirements. The main research problem addressed in this work is estimation of reliability of power converters under aerospace operating conditions. Gate driver failure due to random failures are considered in this work to bring out the effect of random failures on the reliability of the converter.

AEGART SYSTEM DESCRIPTION
17.9 Nm 8000 rpm 12000 rpm 19200 rpm 24000 rpm 32000 rpm
MISSION PROFILE OF AEGART SYSTEM IN A SHORT HAUL AIRCRAFT
POWER LOSS ESTIMATION AND THERMAL MODELLING OF 3L NPC CONVERTER
Hot spot temperature estimation of Capacitors
Junction temperature estimation of IGBTs
Lifetime model and Reliability estimation of IGBTs
Lifetime model and Reliability estimation of Capacitors
Lifetime model of Gate Drivers
Reliability Block Diagram method for full converter reliability
40 Converter
RESULTS AND DISCUSSION

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