Safety-critical design of electromechanical actuation systems in commercial aircraft

Bennett, John W.; Mecrow, B.C.; Atkinson, David; Atkinson, Glynn

doi:10.1049/iet-epa.2009.0304

Cited by 98 publications

(55 citation statements)

References 16 publications

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“…Such operation has been reported in [28] for aircraft steering control and in [29] for an elevator application. This approach is addressed as 'single VSC' operation hereafter, for the specific case of a six-phase drive.…”

Section: Introductionmentioning

confidence: 79%

Post-fault operation of an asymmetrical six-phase induction machine with single and two isolated neutral points

S.¹,

Durán²,

Levi³

et al. 2013

2013 IEEE Energy Conversion Congress and Exposition

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Section: Introductionmentioning

confidence: 79%

Post-fault operation of an asymmetrical six-phase induction machine with single and two isolated neutral points

S.¹,

Durán²,

Levi³

et al. 2013

2013 IEEE Energy Conversion Congress and Exposition

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“…More importantly, aircraft power systems needs to transmit electricity to the loads safely and appropriately. More electric aircraft provide electric power drives for the secondary power components with the help of a large number of power electronic conversion devices, such as autotransformer rectifiers (ATRUs), buck/boost converters [4,5], etc., which provide great convenience in the operation and control of aircraft, however, due to the dynamic, nonlinear, cascading and parallel connections of power electronic devices, the stability of aircraft power systems becomes a more and more prominent issue when high performance in necessary [6,7]. In addition, most of the load stability and there is no a simple and convenient tool for analyzing system stability under both large and small signal disturbances.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Aircraft Power Systems Based on a Unified Large Signal Model

Che

Shi

et al. 2017

Energies

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Abstract:Complex power electronic conversion devices, most of which have high transmission performance, are important power conversion units in modern aircraft power systems. However, these devices can also affect the stability of the aircraft power system more and more prominent due to their dynamic and nonlinear characteristics. To analyze the stability of aircraft power systems in a simple, accurate and comprehensive way, this paper develops a unified large signal model of aircraft power systems. In this paper, first the Lyapunov linearization method and the mixed potential theory are employed to analyze small signal and large signal stability, respectively, and then a unified stability criterion is proposed to estimate small and large signal stability problems. Simulation results show that the unified large signal model of aircraft power systems presented in this paper can be used to analyze the stability problem of aircraft power systems in an accurate and comprehensive way. Furthermore, with simplicity, universality and structural uniformity, the unified large signal model lays a good foundation for the optimal design of aircraft power systems.

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“…With more than two independent currents, multiphase machines [1] are logically chosen when fault tolerance is required in critical applications, such as historically marine electric propulsion supplied by a current-source inverter and, since the 21st century, in marine [2,3], aerospace [4][5][6][7] and automotive traction [8][9][10][11][12], with multiphase machines supplied by a voltage source inverter. The reason is that, referring to classical wye-coupled three-phase machines, which possess the minimum number of independent currents for achieving a rotating field in normal condition, these machines have more degrees of freedom than the minimum necessary, thus allowing a rotating field even with one opened phase.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Optimized Control Strategies of a High-Speed Traction Machine with Five Phases and Bi-Harmonic Electromotive Force

et al. 2016

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Abstract:The purpose of the paper is to present the potentialities in terms of the control of a new kind of PM synchronous machine. With five phases and electromotive forces whose first (E 1 ) and third (E 3 ) harmonics are of similar amplitude, the studied machine, so-called bi-harmonic, has properties that are interesting for traction machine payload. With three-phase machines, supplied by a mono-harmonic sinusoidal current, the weak number of freedom degrees limits the strategy of control for traction machines especially when voltage saturation occurs at high speeds. As the torque is managed for three-phase machines by a current with only one harmonic, flux weakening is necessary to increase speed when the voltage limitation is reached. The studied five-phase machine, thanks to the increase in the number of freedom degrees for control, aims to alleviate this fact. In this paper, three optimized control strategies are compared in terms of efficiency and associated torque/speed characteristics. These strategies take into account numerous constraints either from the supply (with limited voltage) or from the machine (with limited current densities and maximum acceptable copper, iron and permanent magnet losses). The obtained results prove the wide potentialities of such a kind of five-phase bi-harmonic machine in terms of control under constraints. It is thus shown that the classical Maximum Torque Per Ampere (MTPA) strategy developed for the three-phase machine is clearly not satisfying on the whole range of speed because of the presence of iron losses whose values can no more be neglected at high speeds. Two other strategies have been then proposed to be able to manage the compromises, at high speeds, between the high values of torque and efficiency under the constraints of admissible total losses either in the rotor or in the stator.

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Safety-critical design of electromechanical actuation systems in commercial aircraft

Cited by 98 publications

References 16 publications

Post-fault operation of an asymmetrical six-phase induction machine with single and two isolated neutral points

Post-fault operation of an asymmetrical six-phase induction machine with single and two isolated neutral points

Stability Analysis of Aircraft Power Systems Based on a Unified Large Signal Model

Comparison of Optimized Control Strategies of a High-Speed Traction Machine with Five Phases and Bi-Harmonic Electromotive Force

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