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Power Management on Aircraft

Torben Schröter

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Torben Schröter, Power Management on Aircraft (2021), VDE Verlag, Berlin, ISBN: 9783800754700

Getrackt seit 05/2018

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Beschreibung / Abstract

A major development objective when designing new aircraft systems is the continuous improvement of aircraft efficiency. This objective is often achieved by reducing the mass of the aircraft.
This thesis discusses the weight reduction in the aircraft electrical distribution system. In doing so, the focus of the studies described lies with the optimization of that part of the electrical system which supplies power to non-flight relevant electrical consumers. The optimization approach benefits from the use of an effective electrical Power Management (PM) function. This function allows for the dimensioning of the distribution capacities based on in-service current measurements instead of theoretical values. This approach demands devising a mathematical method that makes it possible to calculate the feasible level of optimization of the distribution capacities. The mathematical method must take safety and reliability requirements as well as customization aspects into account.
After the introduction, this thesis describes the state of the art of the aircraft electrical system, electrical consumers, relevant mathematics, and typical applications of electrical load management schemes.
The third chapter delineates the newly developed mathematical method for identifying limited network resources. A new quantity, which shall be referred to as Mean Time Between Under-Capacities (MTBUC) and its inverse, the under-capacity rate, characterize a key element of the method. The method integrates aspects of airline customization, too. The fourth chapter focuses on data quality for using measurements to dimension network resources, prerequisites relevant to the application of the new mathematical approach, and how to perform an electrical load analysis for networks with limited resources. The chapter concludes with a benefit analysis of the PM approach. Chapter five elaborates on how to realize a PM function on the aircraft studied, discussing elements like PM integration, protective devices, PM algorithms, and PM realizations for single-phase and three-phase electrical power lines. Chapter six analyzes another four approaches to optimize the electrical system and compares those with the approach forming the main focus of the thesis.
The thesis concludes with a summary and an outlook to additional topics for the further development of the aircraft electrical system.

Leseprobe

Inhaltsverzeichnis

  • Power Management on Aircraft
  • Titelseite
  • Impressum
  • Power Management on Aircraft – Dissertation
  • Gutachter
  • Acknowledgments
  • Contents
  • 1 Introduction
  • 1.1 Motivation
  • 1.2 Objectives and Structure of the Thesis
  • 2 State of the Art
  • 2.1 Basic Terms and Definitions
  • 2.2 The Aircraft Electrical System
  • 2.3 Electrical Cabin and Cargo Systems
  • 2.4 Safety and Reliability
  • 2.5 Statistics
  • 2.6 The Knapsack Problem
  • 2.7 Electrical Power Management Applications
  • 3 Identifying Limited Network Resources by Extended Fault Tree Analysis
  • 3.1 Mean Time Between Under-Capacities (MTBUC)
  • 3.2 Identifying Limited Resources by Means of MTBUC
  • 3.3 Risk of Under-Capacities in Systems with Limited Resources
  • 3.4 Summary of Chapter 3
  • 4 Electrical Load Analysis under Limited Network Resources
  • 4.1 Data Quality
  • 4.2 Systems Dependency Study
  • 4.3 Electrical Load Analysis
  • 4.4 Benefits and Drawbacks of Network Design with Limited Resources
  • 4.5 Summary of Chapter 4
  • 5 Power Management on Aircraft
  • 5.1 Power Management and the Protective Device
  • 5.2 Single-Phase Reactive Power Management
  • 5.3 Three-Phase Reactive Power Management
  • 5.4 Proposal for Final Power Management Realization
  • 5.5 Summary of Chapter 5
  • 6 Further Concepts for Electrical Network Weight Reduction
  • 6.1 230 VAC Main Power Supply
  • 6.2 Split Primary Power Center
  • 6.3 Multiple AC Points Of Regulation – Multi AC POR
  • 6.4 Cross-ATA Chapter Network Design / “Quick Win"
  • 6.5 Summary of Chapter 6
  • 7 Summary and Outlook
  • 7.1 Outlook
  • Bibliography
  • A Abbreviations
  • B Supplement to State of the Art
  • B.1 Electrical Network Quality
  • B.2 Supplement to Cabin and Cargo Systems
  • C Supplement to Chapter 3
  • C.1 Usage Factors
  • C.2 Further Results on Convolution
  • D Supplement to Chapter 4
  • D.1 Data Preparation
  • D.2 Further Results on Systems Dependency
  • E Supplement to Chapter 5
  • E.1 RCCB Model Validation
  • E.2 Power Management Studies – Further Results and Additional Information
  • F Scientific Work
  • F.1 Publications
  • F.2 Supervised Student Theses
  • Index
  • Curriculum Vitae
  • Abstract / Keywords
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