Stability Study of DC Electric Power System with Paralleled Generators for More-Electric Aircraft

This study aims at investigating the synergy between powertrain and structure within the design process of a fixed-wing tail-sitter unmanned aerial vehicle (UAV). The UAV is equipped with a pure-electric power system and has vertical take-off and landing capabilities (VTOL). The problem is addressed by running a contemporary optimization of the parameters of both the powertrain and the UAV’s structure, in order to maximize electric endurance and payload weight through the usage of a performant multi-objective evolutionary algorithm named SMS-EMOA. Three different designs are selected, discussed and compared with literature results on the same UAV to quantify the increase of payload and cruise time that can be obtained by exploiting the synergy between structure and powertrain. The potentiality of furtherly improving payload through the usage of multi-functional panels, while keeping the same endurance, is also quantified and compared with the technologies proposed in literature.

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Model and Simulation of Permanent Magnets Synchronous Machine (PMSM) of the Electric Power Supply System (EPS), in Accordance with the Concept of a More Electric Aircraft (MEA)

ITM Web of Conferences ◽

10.1051/itmconf/20181603004 ◽

2018 ◽

Vol 16 ◽

pp. 03004 ◽

Cited By ~ 1

Author(s):

Lucjan Setlak ◽

Rafał Kowalik

Keyword(s):

Power System ◽

Electric Power ◽

Power Supply ◽

Power Supply System ◽

Permanent Magnets ◽

Synchronous Generator ◽

Supply System ◽

Power Sources ◽

Electric Aircraft ◽

More Electric Aircraft

Based on the mathematical model of synchronous electric machine, basing on permanent magnets, presented in this paper, the key importance of alternator AC power sources in the form of generator (for conventional aircraft) and in the form of integrated unit starter/AC synchronous generator S/G AC (with respect to advanced aircraft concept in the field of more/all electric power MEA/AEA) was highlighted. In addition, through the analysis and selected simulations of the power supply system of a modern aircrafts, sources of onboard electrical energy (synchronous generator, integrated unit starter/AC generator) were located in board autonomic power system ASE (EPS, PES). Key components of this system are the electro-energetic power system EPS and the energo-electronic power system PES. Additionally, the analysis and exemplary simulations of key electricity sources based on mathematical models have contributed to highlighting the main practical applications in line with the trend of a more electric aircraft.

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Reliability Evaluation for Aviation Electric Power System in Consideration of Uncertainty

Energies ◽

10.3390/en13051175 ◽

2020 ◽

Vol 13 (5) ◽

pp. 1175

Author(s):

Yao Wang ◽

Xinqin Gao ◽

Yuanfeng Cai ◽

Mingshun Yang ◽

Shujuan Li ◽

...

Keyword(s):

Power System ◽

Electric Power ◽

System Reliability ◽

Probability Distributions ◽

Rapid Development ◽

Reliability Evaluation ◽

Electric Power System ◽

Traditional System ◽

Electric Aircraft ◽

System Time

With the rapid development of more electric aircraft (MEA) in recent years, the aviation electric power system (AEPS) has played an increasingly important role in safe flight. However, as a highly reliable system, because of its complicated flight conditions and architecture, it often proves significant uncertainty in its failure occurrence and consequence. Thus, more and more stakeholders, e.g., passengers, aviation administration departments, are dissatisfied with the traditional system reliability analysis, in which failure uncertainty is not considered and system reliability probability is a constant value at a given time. To overcome this disadvantage, we propose a new methodology in the AEPS reliability evaluation. First, we perform a random sampling from the probability distributions of components’ failure rates and compute the system reliability at each sample point; after that, we use variance, confidence interval, and probability density function to quantify the uncertainty of system reliability. Finally, we perform the new method on a series–parallel system and an AEPS. The results show that the power supply reliability of AEPS is uncertain and the uncertainty varies with system time even though the uncertainty of each component’s failure is quite small; therefore it is necessary to quantify system uncertainty for safer flight, and our proposed method could be an effective way to accomplish this quantization task.

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