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http://hdl.handle.net/11375/28325
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DC Field | Value | Language |
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dc.contributor.advisor | Narimani, Mehdi | - |
dc.contributor.author | Ibrahim, Mohamed | - |
dc.date.accessioned | 2023-02-13T16:18:28Z | - |
dc.date.available | 2023-02-13T16:18:28Z | - |
dc.date.issued | 2023 | - |
dc.identifier.uri | http://hdl.handle.net/11375/28325 | - |
dc.description.abstract | System reliability and design optimization are the main concerns in power electronic converters of more-electric aircraft (MEA). The fundamental distribution networks of aircraft are reviewed to establish context. The Isolated DC-DC converters are considered the building blocks of modern aircraft electrical power distribution systems (EPDSs). The DC/DC converters transfer power from the main generation direct current (DC) bus to various loads aboard the aircraft. As a result of the electrical power demand increase in the emerging EPDSs of MEA architectures, more energy storage systems (ESSs) are utilized in the distribution network. A single DC/DC converter unit is conventionally dedicated to each energy source. This thesis focuses on replacing several DC/DC converters used in the existing distribution networks by more optimized multi-source converter units. Standard industry and literature topologies are reviewed including structures aimed for multi-source system integration. The topology proposed in this thesis aims for a multiple sources/loads integration to improve the power density of the distribution network. The different operating modes of the proposed topology add flexibility to the system enabling power flow between different sources, while controlling the power supplied to the low voltage (LV) network on the aircraft. Better system utilization is achieved as compared to conventional solutions. The system stability is improved considering that the multi-source dual active bridge (MSDAB) topology can be configured to stabilize the high-voltage DC (HVDC) generation bus in case of voltage sag. A power-flow mechanism between the different sources utilizing the magnetizing inductance of the transformer is proposed and discussed as one of the operating modes of the converter. A design process using genetic algorithm (GA) optimization is introduced to optimally select the converter parameters to minimize the converter RMS current. The mathematical model of the proposed MSDAB topology is developed based on Fourier transform of key converter waveforms. The optimization is split into two layers; the first is to select the hardware components and the second is to optimize the converter control parameters. Simulation and experiments of the control schemes were performed to validate optimal operation of the proposed converter. A review of the magnetic components in MEA DC/DC converters is conducted. The high-frequency transformer utilized in such converters is the major contributor to the size and weight besides the thermal management system. An optimization design methodology is introduced to minimize the transformer core size and improve the converter performance through optimized winding configurations. Different magnetic materials, winding configurations, and core paralleling are considered in the optimization process. The trade-offs between the converter efficiency and transformer power density are discussed. The transformer parasitic elements effect on the converter performance is presented. Multi-layer minimum gradient (MLMG) winding configurations are proposed to eliminate the high-frequency oscillations (HFO) caused by the transformer parasitics. The proposed configurations resulted in better converter performance with 20$\%$ improvement in the transformer volume as compared to a similar conventional configuration. Three different transformer configurations are implemented and validated experimentally using an impedance analyzer. The improvements in the converter performance are highlighted through finite element analysis (FEA) simulations and converter experiments. | en_US |
dc.language.iso | en | en_US |
dc.title | MULTI-SOURCE DUAL ACTIVE BRIDGE DC/DC CONVERTER FOR MORE ELECTRIC AIRCRAFT: DESIGN, CONTROL, AND PERFORMANCE OPTIMIZATION | en_US |
dc.type | Thesis | en_US |
dc.contributor.department | Electrical and Computer Engineering | en_US |
dc.description.degreetype | Thesis | en_US |
dc.description.degree | Doctor of Engineering (DEng) | en_US |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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Thesis_Main.pdf | 24.07 MB | Adobe PDF | View/Open |
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