Abstract
This paper addresses the design and implementation of a droop controlled three phase bidirectional AC-DC converter for more electric aircraft (MEA) applications. A unified control strategy using a droop characteristic is presented to achieve the bidirectional power flow between the AC and DC source while maintaining a stable DC output voltage. Based on the rigorous control design, the converter is capable of operating over a wide frequency range with a unity power factor. The key findings obtained from the theoretical analysis are confirmed by simulation studies and further validated by a scaled down laboratory prototype. The practical results show good performance of the bidirectional converter and demonstrate the effectiveness of the proposed control strategies.
Highlights
The more electric aircraft (MEA) concept is one of the major trends in modern aerospace engineering which aims to reduce the overall aircraft weight, operation cost, and environmental impact [1,2].In conventional aircraft, the flight control surfaces are activated by hydraulic actuator systems.For MEA these will be replaced by electro hydrostatic actuators (EHAs) or electromechanical actuators (EMAs) [3]
This paper proposes a droop characteristic to implement bidirectional power flow for a three phase AC-DC converter under variable frequency operation
The trend in the MEA to move from traditional power sources to electrical power requires electrical systems to be redesigned considering variable frequency generation
Summary
The flight control surfaces are activated by hydraulic actuator systems. For MEA these will be replaced by electro hydrostatic actuators (EHAs) or electromechanical actuators (EMAs) [3]. This will significantly reduce the weight of the aircraft which will improve its overall efficiency [2,4]. More electrical power is used to replace the conventional hydraulic, mechanical, and pneumatic power [5]. The onboard installed electrical power increases significantly and this results in challenges in the design of electrical power systems (EPS)
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