Publication: Harmonic Distortion Analysis of an eGPU-Fed Aircraft EPDS with Phase-Shifted Carrier PWM
Date
2024
Authors
Peng Q.
Sun J.
Yang J.
Buticchi G.
Tan N.M.L.
Guenter S.
Wheeler P.
Journal Title
Journal ISSN
Volume Title
Publisher
Institute of Electrical and Electronics Engineers Inc.
Abstract
The integration of power electronics devices into on-board electrical power distribution systems (EPDS) has steadily increased due to the trend toward more electric aircraft (MEA) and all electric aircraft (AEA). Digital control and pulse width modulation (PWM) of these devices give rise to the electrical harmonics, which have been extensively discussed for utility grids. However, the variable fundamental frequency and relatively lower switching-to-fundamental (S2F) frequency ratio in the EPDS result in more severe harmonic distortion and coupling between different subsystems. Onboard power electronic converters (PECs) exhibit greater transparency in compacted environments compared to utility power systems. Therefore, their relative PWM phase-shifted carrier (PSC) angles can be harnessed to cancel switching harmonics. In this work, a 3-bus system with an electric ground power unit (eGPU) converter and two active front end (AFE) converters is used to restore the situation of ground powering of an aircraft. The effect of PSC angles of the PECs on the system harmonics distortion is studied with both balanced and unbalanced load situation. On this basis, an online total harmonic distortion (THD) monitor unit is proposed which could calculate the real-time THD level of the EPDS ac bus within one fundamental period. The accuracy of the proposed THD monitor is verified by PLECS simulation. ? 2024 IEEE.
Description
Keywords
Acoustic surface wave filters , Aircraft power systems , Asynchronous machinery , Computer debugging , Computer resource management , Computer workstations , DC distribution systems , Electric distortion , High pass filters , Modems , More electric aircraft , Notch filters , Passive filters , Signal receivers , Ac-dc converters , Electrical power distribution systems , Ground power units , Harmonic distortion analysis , Harmonics distortion , More electric aircraft , Phase shifted , Power electronics converters , Pulsewidth modulations (PWM) , Total harmonic distortions , Harmonic distortion