Abstract
In more electric aircraft (MEA), weight reduction and energy efficiency constitute the key figures. In addition, the safety and continuity of operation of its electrical power distribution system (EPDS) are of critical importance. These sets of desired features are in disagreement with each other because higher redundancy, needed to guarantee the safety of operation, implies additional weight. In fact, EPDS is usually divided into isolated sections that need to be sized for the worst case scenario. Several concepts of EPDS have been investigated, aiming at enabling the power exchange among separate sections, which allows better optimization for power and weight of the whole system. In this article, an approach based on the widespread use of multiport power converters for both dc/dc and dc/ac stages is proposed. System integration of these two is proposed as a multiport power conversion system (MPCS), which allows a ring power distribution, while galvanic isolation is still maintained, even in fault conditions. Thus, the redundancy of MEA is established by no significant weight increase. A machine design analysis shows how the segmented machine could offer superior performance to the traditional one with the same weight. Simulation and experimental verifications show the system feasibility in both normal and fault operations.
Highlights
T HE more electric aircraft (MEA) framework draws a lot of attention among the power electronic experts as it simultaneously belongs to the areas of smart power distribution, micro grids and transportation electrification
To improve the weight/volume consumption and efficiency as well as increase the safety and availability of the electrical power distribution system (EPDS), this paper proposes multiport power conversion systems (MPCSs) [4,5,6,7]
The experiment can be divided into three parts: a) All ports of quadruple active bridge (QAB) converter are connected, the whole system is running with balance loads; b) A supply port of QAB converter is disconnected from DC power supply, the whole system is running with single DC source; c) A load port of QAB converter is disconnected from inverter, only one inverter is powered and the machine is running in single threephase mode
Summary
The safety and continuity of operation of its electrical power distribution system (EPDS) is of critical importance. These sets of desired features are in disagreement with each other, because higher redundancy, needed to guarantee the safety of operation, implies additional weight. An approach based on the widespread use of multi-port power converters for both DC/DC and DC/AC stages is proposed System integration of these two is proposed as a multiport power conversion system (MPCS), which allows a ring power distribution while galvanic isolation is still maintained, even in fault conditions. High frequency AC currents of an MAB (or a QAB) High frequency AC voltages of an MAB (or a QAB) QAB transformer leakage inductances QAB DC capacitances QAB switching frequency Phase shift angles for the H-bridges of QAB d-axis and q-axis currents 2×3-phase machine AC currents DC port currents of a QAB DC port powers of a QAB
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