A Comparative Study of Failure-Tolerant Three-phase RTRUs for More Electric Aircrafts

Singh, Akshay; Mallik, Ayan; Khaligh, Alireza

doi:10.1109/apec.2019.8722048

Cited by 6 publications

(4 citation statements)

References 29 publications

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“…Here, the analytic expression for the energy buffering requirement ∆E dc,a is rather involved and therefore omitted. However, ∆E dc,a can be easily calculated numerically from (13) and is provided in Tab. 3.…”

Section: ) Conventional Modulationmentioning

confidence: 99%

“…1). Further, such a phase-modular realization features a high failure tolerance [13] and the system can continue operation with reduced output power in case one or even two converter modules fail. The main weakness of a phase-modular converter realization is, however, the fact that the input power of each PFC rectifier module pulsates at twice the mains frequency (which is inherent to single-phase power conversion) such that large dc-link capacitors C dc are required, which may cover a large fraction of the overall converter volume and/or limit the system lifetime [18], [19].…”

Section: Introductionmentioning

confidence: 99%

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Third-Harmonic-Type Modulation Minimizing the DC-Link Energy Storage Requirement of Isolated Phase-Modular Three-Phase PFC Rectifier Systems

et al. 2023

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A three-phase ac/dc converter with high-frequency isolation can be realized as a monolithic three-phase or as a phase-modular system by combining three single-phase Power Factor Correction (PFC) rectifier modules with individual isolated dc-dc converters. Advantageously, for a phase-modular system the module configuration can be changed depending on the instantaneous input-output voltage ratio (i.e., a star-(Y)-or a delta-(∆)-arrangement such that wide voltage ranges can be covered without a massive over-dimensioning of the main power components. However, the main disadvantage of a phase-modular converter realization is the fact that the input power of each PFC rectifier module pulsates at twice the mains frequency (which is inherent to single-phase power conversion) such that large dc-link capacitors are required. Recent literature predicts a substantial power pulsation reduction enabled by means of third-(3 rd )harmonic injection modulation which is applicable for the Y-connection (where a common-mode (CM) / zero-sequence (ZS) voltage is injected), and for the ∆-connection of the three single-phase PFC rectifier modules (where a CM / ZS current is injected). This changes the distribution of the power flow in the three-phase system and the power pulsation is shifted to higher frequencies. This paper experimentally verifies and extends the dc-link energy storage requirement reduction of the 3 rd -harmonic injection modulation concept: In a first step, the derivation of the harmonic injection concept is recapitulated and suitable control methods are discussed for both CM voltage (Y-arrangement) and CM current (∆-arrangement) injection. Further, an alternative CM voltage injection strategy with simplified reference generation based only on the instantaneous grid voltage measurements is presented and compared to the pure 3 rd -harmonic injection modulation. Measurement results obtained from a 6 kW prototype reveal a dc-link voltage variation and/or energy buffering reduction by up to 38.6 % enabled by the harmonic injection modulation compared to conventional operation without 3 rd -harmonic injection modulation.

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Section: ) Conventional Modulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Third-Harmonic-Type Modulation Minimizing the DC-Link Energy Storage Requirement of Isolated Phase-Modular Three-Phase PFC Rectifier Systems

et al. 2023

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“…From the above two equations involving T HS , the upper bound of heatsink thermal resistance can be found out, as shown below [35]:…”

Section: Thermal Management Systemmentioning

confidence: 99%

“…6), while not exceeding the maximum junction temperature. Hence, the limit on heatsink thermal resistance ( R th ) is given by the following relationships

T_{HS} = T_{ambience} + normalΔ T_{\max} - P_{device} ()(, R_{jc} + R_{cs})

Since the sum of all device power losses is dissipated on the heatsink, its temperature can be written as follows:

T_{HS} = T_{ambience} + R_{sa} \sum_{i = 1}^{n} P_{device, i}

From the above two equations involving

T_{HS}

, the upper bound of heatsink thermal resistance can be found out, as shown below [35]:

R_{th} < \frac{\min ()(, normalΔ T_{\max} - P_{device, i} ()(, R_{jc} + R_{cs})) for i ϵ (][, 1, n)}{P_{heatsink}}

The thermal resistance of the heatsink is a function of net volume, fin count, surface area, baseplate thickness, and fan speed under a force‐air‐cooled system. The thermal resistance of the heatsink is given by

R_{HS} = \frac{1}{h ()(, A_{base} + N_{fin} A_{fin} η_{fin})}

where h is the convective heat transfer coefficient, A base is the exposed base surface area between fins, N fin is the number of fins,

η_{fin}

is the fin efficiency, and A fin is the surface area per fin taking into account both sides of the fin.…”

Section: Optimised Design Of the Rtru Systemmentioning

confidence: 99%

Optimisation of power electronics for regulated transformer rectifier units

Mallik

Singh

Khaligh

2020

IET Power Electronics

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This study presents a comprehensive approach for the design optimisation of passive components and heatsinks in power electronic converters. The design and selection of passive components are posed as a multi-objective optimisation problem, which can be simplified to a single-objective optimisation based on preferences and weights assigned by the designer. The mathematical equations describing the efficiency, volume, and reliability are laid out to describe the feasible space for optimisation in this study. In addition to the proposed optimisation, a substantial amount of passive component comparison data has been consolidated and presented in this study. The results from the optimisation are demonstrated on the target power electronic circuit of a regulated transformer rectifier unit for more-electric aircrafts. The optimisation framework is developed in a generic manner that would lend itself to the optimisation of any choice of converter topology, circuit components, or objective functions.

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New Third-Harmonic Injection Modulation Reducing the DC-Link Energy Buffer Requirement of Phase-Modular Three-Phase Isolated PFC AC/DC Converter Systems

Menzi

Kolar

Anderson

et al. 2021

2021 IEEE 22nd Workshop on Control and Modelling of Power Electronics (COMPEL)

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A Comparative Study of Failure-Tolerant Three-phase RTRUs for More Electric Aircrafts

Cited by 6 publications

References 29 publications

Third-Harmonic-Type Modulation Minimizing the DC-Link Energy Storage Requirement of Isolated Phase-Modular Three-Phase PFC Rectifier Systems

Third-Harmonic-Type Modulation Minimizing the DC-Link Energy Storage Requirement of Isolated Phase-Modular Three-Phase PFC Rectifier Systems

Optimisation of power electronics for regulated transformer rectifier units

New Third-Harmonic Injection Modulation Reducing the DC-Link Energy Buffer Requirement of Phase-Modular Three-Phase Isolated PFC AC/DC Converter Systems

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