How AC power is generated on the Boeing 787DreamlinerThe AC power is mainly a three-phase way generatorat ii5VAC with a 400Hz. The 400Hz has been a standard for years as the powercan be generated with lighter and smaller generators that 50/60Hz systems.Although using higher frequencies is not ideal for transmitting power at longdistances, it is ideal for airspace application because of the lighter system.The power distribution systems used in the 787 aircraft creates a complexity toimpact the power generation system design to enable it route power around thelocalized faults to maintain the airworthiness of the aircraft (Dornheim, 2005).
The 787 aircraft run power from the generator directly to the electricalequipment bay from where it is distributed to various locations within theaircraft. The Boeing 787 Dreamliner is known to use less pneumatic and moreelectricity to power the systems like the wing-ice protection, hydraulicsystems, and to start the engine. Systems electrification is a major focus ofaircraft architectures. Its electrification is important as it enables thedesign, maintenance, and manufacturing optimizations.
Correct electrificationis beneficial because:· It improves theoverall system performance· It is morereconfigurable and flexible· Has astreamlined manufacturing and assembly· Has simplifiedmaintenance operations· The AC powerfrequency depends on the engine speed hence variable. The Boeing 787 Dreamlinerhas four generators, two on the auxiliary power unit and the other two on eachengine.· The system thatfeeds the systems run from these generators to the electrical equipmentlocations. · There are 17electrical sub-stations provide power to localized bays.
· The sixgenerator in the 787 is to hell the aircraft generate more electricity as ituses more than the other Boeing aircraft.· On the ground,the Boeing 787 Dreamliner can start without power generation. · The APU generatorsstart to power the engine generators using the APU battery and then thesegenerators start the engines. · The primarysource of electrical power when the aircraft is on flight mode are the fourengine generators while the APU generators are the secondary sources. The powergenerated by these generators are used as the four alternating current buses.· In the AC, thepower is either distributed to be used as 235 VAC or converted to what thesystem needs. · The other powersources for the AC system in the Boeing 787 include the main battery.
The mainbattery is used to generate power for ground operations, such as braking theaircraft. · The generated groundpower produced by the APU battery is capable of connecting via the three power vessels.· The APU andmain battery, and ram-air turbine serve as the power backups in the flight incase the aircraft experiences a power failure. The state-of-the-art technology has developed analternating current generator starter. The main functions of the AC Starter-Generatorinclude to electrically generate power to start the engine as well generatemain electrical power for the aircraft network which is a system that can beused to generate AC power in the 787 aircraft.Summing up, the Boeing 787 Dreamliner has four mainGCUs that are associated with the engine mounted to the six generators (Norrisand Wagner, 2009).
If all of the GCUs are powered up at the same time, afterabout two hundred and forty-seven days of continuo power, all the four GCUswill fail at the same time; thus the AC power will not be generated anymoreregardless of the flight phase. Work citiedDornheim, M. A.
(2005).Massive 787 Electrical System Pressurizes Cabin. Aviation Week &Space Technology, 47.Norris, G., & Wagner, M.(2009). Boeing 787 dreamliner. Zenith Press.