access icon free Power sharing strategy for multi-source electrical auxiliary power unit with bi-directional interaction capability

© The Institution of Engineering and Technology
Received 16/06/2019, Accepted 24/01/2020, Revised 17/01/2020, Published 14/02/2020

This study presents a hierarchical control strategy for an auxiliary power unit (APU) for aircraft to coordinate multiple power sources and control developed power electronic interfaces. The study benefits from the presence of a hybrid energy system in paralleled structure to the main generator as the complementary system. The employed structure enhances power quality and improves the voltage profile of the high-voltage DC bus. Furthermore, the developed bi-directional topology provides the possibility of interaction with the grid. Considering the APU features in an aircraft, a hierarchical control strategy with different levels of control, timescale, dynamic response, and significance are developed. The developed controller consists of a power management algorithm in the higher level, and local voltage and current controllers in the lower one. The algorithm aims to maximise the PV sub-system utilisation, overcome voltage fluctuations, increase power density, reduce operation costs, and increase system availability while allowing further development to larger systems. Simulation and experimental results confirm the robustness of the algorithm. The result shows that the proposed power sharing strategy optimises the system utilisation while achieving a high-quality voltage profile under severe fluctuations. Moreover, the stress on the battery pack is reduced to improve the life cycle and reduce operation costs.

Inspec keywords: power electronics; power distribution control; battery powered vehicles; electric current control; power generation control; power control; distributed power generation; power supply quality

Other keywords: voltage fluctuations; power sharing strategy; employed structure; multisource electrical auxiliary power unit; increase system availability; APU features; PV sub-system utilisation; power electronic interfaces; power management algorithm; paralleled structure; power quality; high-quality voltage profile; increase power density; high-voltage DC bus; aircraft; study benefits; multiple power sources; current controllers; developed bi-directional topology; hybrid energy system; hierarchical control strategy; complementary system; bi-directional interaction capability; local voltage

Subjects: Current control; Control of electric power systems; Distributed power generation; Distribution networks; Power and energy control

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