Abstract
Electric drives are an essential part of more electric aircraft (MEA) applications with ever-growing demands for high power density, high performance, and high fault-tolerant capability. High-speed motor drives can fulfill those needs, but their speeds are subject to the relatively low dc-link voltage adopted by MEA. The power inverters are thus expected to efficiently and effectively manage that limited voltage. A recently popular topology is represented by the dual inverters. They are featured by inherited fault tolerance, a high dc-link voltage utilization, and an excellent output power profile. This article aims to present a comprehensive review of different structures based on the dual inverter. To meet the stringent requirements of MEA applications, three performance aspects, including the voltage utilization, the inverter output quality, and the fault-tolerant capability, are selected. Based on the chosen performance metrics, the key features of adopting dual inverter topologies against other converter selections are explicitly demonstrated. Finally, a practical guideline for choosing suitable dual inverters for different MEA applications is provided.
Highlights
In civilian aircraft, the gas turbines provide the power primarily for the propulsion thrust and the secondary power required for all the onboard systems [1]–[3]
Researchers in [24] have applied the dual inverter with a floating capacitor (FC) for driving electromechanical actuators (EMAs) in the secondary flight control surface
The operation principle, modulation schemes, capacitor voltage regulation, and the voltage ratio considerations of dual inverters were elaborated in sequence
Summary
The gas turbines provide the power primarily for the propulsion thrust and the secondary power required for all the onboard systems [1]–[3]. Higher power densities, coupled with excellent efficiency are fast becoming the standard requirement for applications in the MEA. Multilevel inverters are being recognized as one of the most promising solutions for MEA applications Their reduced dv/dt, better power quality and higher efficiency are perceived to give a significant advantage over traditional two-level inverters [28]. This is followed by reviewing three exclusive design freedom featured by dual inverters, the configurations, modulation schemes, and voltage ratio assignments in Section V that may optimize their performance.
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