SYSTEM LEVEL MODELING AND ANALYSIS OF POWER PROCESSING IN B737-X AUXILIARY POWER UNIT USING SABER HIERARCHICAL TOOLS

摘要

Saber simulator hierarchical tools were used to model, simulate and analyze power processing in the Auxiliary Power Unit (APU) of Boeing 737-X aircraft. In particular, the subsystems of the Exciter Power Supply (EXPS) in start mode and the Voltage Regulator (VR) in generate mode were modeled in a hierarchical manner providing the means of functional understanding and analysis during the system integration within the broader scope of the APU system. Both subsystems control magnetic field in a three-phase synchronous machine that is operated in either motoring or generating mode by appropriate power processing. The inherent plant nonlinearities as well as the control of both the EXPS and VR were modeled from the bottom (detailed) to the top (system) level. The procedure for the hierarchical modeling is presented. The results of the simulation are compared to the experimental results for verification.