Abstract
The grid-injected current total harmonics distortion (THD) and electromagnetic interference (EMI) noise must be considered in a transformer-less grid-connected inverter for a more electric aircraft (MEA) system. This paper develops a procedure for the design of the magnetic components of the LCL filter used in harmonic control and EMI reduction of the silicon carbide (SiC) grid-connected inverter in the MEA. The LCL filter is designed with effective harmonic attenuation and a compact size. To meet the space constraint requirement, specific design attention is focused on a customized amorphous cored inductor, with a comprehensive study of the relationships of inductor winding with respect to EMI noise. Reduced THD and EMI are verified through experiments performed on a 30 kW, 230 V/400 Hz three-phase grid-connected inverter prototype with the LCL filter.
Highlights
The concept of more electric aircraft (MEA) is based on the increasing use of electric power to replace the non-electric subsystems in the traditional aircraft.The MEA concept provides significant improvements in reliability, maintenance cost, fuel consumption, and overall weight of the aircraft [1,2,3,4]
Because of the strict weight and space constraints, an electric starter/generator (ESG) is employed that acts as a motor to start the gas turbine engine and as a generator to convert the mechanical power to electrical power used to supply the onboard loads [5]
Compact and efficient magnetic components design in the power inverter results in minimization of its total size and weight; magnetic material plays an important role in the grid-connected high power density inverter [6,7]
Summary
The concept of more electric aircraft (MEA) is based on the increasing use of electric power to replace the non-electric subsystems (pneumatic, mechanical, and hydraulic) in the traditional aircraft. In addition to the power quality of the power grid, another important issue is the conducted electromagnetic interference (EMI), which is mainly generated by the high frequency transistor switching and parasitic components in the noise conduction path [13,14,15]. In Reference [17], the reduced EMI noise in the AC side of the inverter has been observed but the parasitic components in the LCL filter are not considered. If total harmonics distortion (THD) and EMI can be reduced at the same time with one filter, the power density would be increased pronouncedly. To address this problem, a higher order filter with a copper foil-wound inductor is used instead.
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