Control of Three-Source High Voltage Power Network for More Electric Aircraft

This paper proposes a simulation model of the control strategy for the high voltage power network with three power sources in the future aircraft. These power sources include two generators coupled to the aircraft turbine engine and a high voltage (HV) battery. The two generators together with the battery are delivering the power in parallel to a 270VDC dynamic load. The generators are two six-phase externally excited synchronous machines (EESM) operating in the generation mode. One of these machines is also used as a starter generator (SG). A voltage source inverter (VSI) is utilized to start the engine and to obtain the DC power when the machine is operated as a generator. The second machine is operated only as a generator (G) and the output AC voltage of this machine is passively rectified. The generators and the battery are delivering a maximum power of 160kW to the load. A battery model with a DC/DC converter is used as a third power source and as a load. The operation of the parallel connected sources is analyzed in selected fault conditions.