Control Design and Voltage Stability Analysis of a Droop-Controlled Electrical Power System for More Electric Aircraft

Abstract

A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. I. INTRODUCTIONHE more-electric aircraft (MEA) concept is one of the major trends in modern aerospace engineering aiming for reduction of the overall aircraft weight, operation cost and environmental impact. Electrical systems are employed to replace existing hydraulic, pneumatic and mechanical actuators. As a consequence, the onboard installed electrical power increases significantly and this results in challenges in the design of the aircraft electrical power systems (EPS). The tendency is to replace traditional AC distribution with highvoltage DC distribution. This can increase efficiency, reduce weight and remove the need for reactive power compensation devices [1], [2].In literature, the primary power distribution in aircrafts has been traditionally based on the single-generator-per-bus paradigm with switched distribution providing the connectivity and system integrity. Instead, the proposed "single-bus" concept uses the micro-grid approach in which all the generators and loads are connected to a single distribution bus. This single bus configuration has been widely used in other applications such as residential microgrids [3]. Such a system has the potential to considerably reduce the EPS weight since bus mass is reduced and load and generator fault isolation function can be integrated in power converters; in addition the controlled power sharing between generators has the potential to reduce generator capacity and operate at maximum efficiency levels.As the parallel operation of multiple generators is a promising solution for the MEA EPS, appropriate power sharing among the different power sources needs to be carefully considered. From the communication point of view, overall control of DC systems can be divided into three categories: distributed control, centralized control and decentralized control [4].

A Modified Neutral Point Balancing Space Vector Modulation for Three-Level Neutral Point Clamped Converters in High-Speed Drives

“…The q-axis current reference is set by the outer speed loop when the system operates in starter mode. During flight, the system operates in generation mode and the q-axis current reference is set by the DC-link current demands dictated by a droop control technique [26][27]. In such circumstances, both q-axis and d-axis currents are negative, a large negative d-axis current is constantly required for flux weakening.…”

A Novel Autonomous Current-Sharing Control Strategy for Multiple Paralleled DC–DC Converters in Islanded DC Microgrid

“…Due to the diversity and decentralization of distributed energy, power converters are usually used to connect them in order to realize energy conversion and management. How to achieve parallel operation, accurate load current sharing between power converters, and maintain stability has become a research hotspot in microgrids [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. With the increasing demand of DC power at load side and the rapid development of distributed DC power sources such as photovoltaic cells, wind power, storage batteries, fuel cells, and supercapacitors, the research on DC microgrids has been gradually increasing in recent years [7][8][9].…”

“…With the increasing demand of DC power at load side and the rapid development of distributed DC power sources such as photovoltaic cells, wind power, storage batteries, fuel cells, and supercapacitors, the research on DC microgrids has been gradually increasing in recent years [7][8][9]. Nowadays, DC microgrids have been preliminarily applied in independent power supply systems such as marine power systems, aerospace systems, and data centers [10][11][12].…”

A Quadruple Active Bridge Converter for the Storage Integration on the More Electric Aircraft

“…Under new trends of aircraft, the EPDS is designed on the concept of a highly decentralized, modular and flexible DC smart-grid, based on bi-directional DC/DC converters and solid state-based secondary distribution modules, with the utilization of energy storage systems. The parallel operation, along with power sharing capability of multiple generators, has been investigated to reduce generators size [4]. Nevertheless, the presence of power converters, often acting as constant power loads, introduces stability problem in the envisaged future EPDS [5], [6].…”