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Benefits of higher voltage levels in aircraft electrical power systems

In new aircraft architectures the electrical power is in perpetual growth, because the present hydraulic and pneumatic systems are being eliminated and replace by electrical systems. Therefore the increase of electrical power has to be managed. With the constantly increasing electrical power demand onboard of aircraft, new electrical voltage levels are actually alluded, in order to respond to these challenges. Many advantages of high voltage alternating current (HVAC) and high voltage direct current (HVDC) in the aircraft electrical power system (EPS), in compliance with the aviation's jargon, namely 230V AC constant or variable frequency and +/- 270V DC (or 540V DC between positive and negative potentials), are presented in comparison with the conventional 115V AC with constant or variable frequency and 28V DC ESP. The adoption of higher voltage levels must comply with the system requirements. Power quality, weight comparison as well as applicability are exhibited at power generation, distribution and load level. Issues regarding the simultaneous supply with HVAC and HVDC are discussed. Current technological research for these changes will be overviewed.