Optimization of the Energy-Supply-Structure of modern Aircraft by using conventional power system technologies Dipl.-Ing. Ilir Purellku Electrical Power Systems Helmut-Schmidt-University Hamburg, Germany

Contents Introduction Layout of a modern aircraft electrical grid Conventional power system technologies Protection mechanisms Phase balancing of the distribution network Conclusion Ilir Purellku – Germany – RIF Session 3 – 0973

Installed generator power on aircraft Trend: More Electric Aircraft - MEA Ilir Purellku – Germany – RIF Session 3 – 0973

Layout of modern aircraft energy supply grid Architecture improvement due to different network topologies Ilir Purellku – Germany – RIF Session 3 – 0973

Use of conventional power system technologies Load management High Voltage DC Multiple fed grids Electrical protection concepts Ilir Purellku – Germany – RIF Session 3 – 0973

Electrical protection concepts Grid protection mechanism with integrated Fuel Cell System - FCS Stepped-Curve Overcurrent Protection Activate the protection mechanism only for a specific current direction Impedance-Protection Connect the FCS in an electrical ring structure Ilir Purellku – Germany – RIF Session 3 – 0973

Smart phase balancing of the distribution network Advantages: Weight saving due to lighter return conductor network Less power loss in the electrical network Ilir Purellku – Germany – RIF Session 3 – 0973

Phase balancing realization Ilir Purellku – Germany – RIF Session 3 – 0973

Conclusion Necessity of optimized electrical power systems due to growing demand of electrical power onboard of aircraft Further protection concepts due to higher safety requirements Combination of Stepped-Curve Overcurrent Protection as well as Impedance Protection Optimization of the network due to the reduction of the asymmetries Ilir Purellku – Germany – RIF Session 3 – 0973

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