دكتوراه
هندسة
Queen’s University Belfast
مجال التميز | تميز دراسي وبحثي |
البحوث المنشورة |
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البحث (1): | |
عنوان البحث: | Isolated and Non-Isolated DC-to-DC Converters for Medium Voltage DC Networks: A Review |
رابط إلى البحث: | https://ieeexplore.ieee.org/document/9210538 |
تاريخ النشر: | 01/10/2020 |
موجز عن البحث: | MVDC technology is a promising solution to avoid installation of new AC networks. MVDC can provide optimum integration of large-scale renewable energy sources, the interconnection of different voltage levels of DC and AC grids with the ancillary services. The development in MVDC depends significantly on the DC-DC converters. Such converters support the modern trends of utilising medium-frequency transformers in power networks. Research on isolated converters technology is in its infancy and limited by the conversion ratio and component ratings. Besides, there is no standards exist covering specific aspects of isolated converter product. Thus, a review of such converters is needed. This work presents, for the first time, a review of the DC-DC power converter families in MVDC grids including the leading families which are isolated and non-isolated converters, as well as other subfamilies comparing the specifications and characteristics. Also, the applications of these converters are provided by focusing on the essential requirements for each application. |
المؤتمرات العلمية |
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المؤتمر (1): | |
عنوان المؤتمر: | 9th INTERNATIONAL CONFERENCE on RENEWABLE ENERGY RESEARCH and APPLICATIONS (ICRERA 2020) |
تاريخ الإنعقاد: | 27/09/2020 |
مكان الإنعقاد: | Glasgow, United Kingdom |
طبيعة المشاركة: | Paper presentation |
عنوان المشاركة: | Bidirectional DC-DC Resonant Converter Design for Electric Vehicle Charging Stations Integration to MVDC Grids |
ملخص المشاركة: | The extensive use of electric vehicles (EVs) needs ultra-fast-charging stations with high charging power greater than 22 kW (P Charging >22kW). Medium voltage direct current (MVDC) grids can provide the best solution for the high demand of EVs and fast-charging stations infrastructures with the existing distribution grids. The resonant bidirectional dual active bridge (DAB) DC-DC converter can be a promising technology in integrating an electric vehicle charging station (EVCS) with MVDC grid. This work focuses on the converter design with voltage control and stability by applying two different control strategies mainly: PI control and sliding mode control (SMC). All simulations will be performed in order to present the feasibility of the proposed solution and compare the results of each control methods. This comparison, for the first time, in the medium voltage level can open new insights for using nonlinear control methods such as SMC to ensure stability and obtain better dynamic performance. |
الرابط: | https://icrera.org/archieve2020/files/BOOKLET_final.pdf |
المؤتمر (2): | |
عنوان المؤتمر: | CENTRE FOR POWER ELECTRONICS ANNUAL CONFERENCE |
تاريخ الإنعقاد: | 13-15 /07/ 2021 |
مكان الإنعقاد: | Bristol, United Kingdom |
طبيعة المشاركة: | Oral presentation (Early Career Researcher Presentations) |
عنوان المشاركة: | Current Sharing with Dual Phase-Shift Control for IPOP of Modular CLLC Dual Active Bridge DC-DC Converters |
ملخص المشاركة: | Medium Voltage DC (MVDC) distribution networks shape modern distribution power systems’ futures since they provide a co-infrastructure tied to different AC and DC networks’ voltage levels and enable easy connection for large-scale renewable energy sources. Concerning the integration of MVDC to LVDC systems, the input-parallel output-parallel (IPOP) arrangement is preferable for high-power applications under medium-frequency isolation. IPOP system based on CLLC resonant dual active bridge (DAB) converters operating under dual-phase shift modulation is a promising topology achieving both zerovoltage switching (ZVS) and zero-current switching (ZCS). That results in high efficiency and high-power density. Besides, the CLLC DAB can reduce the number of magnetic components and the size of the medium-frequency transformer magnetizing inductance. However, one of the most significant challenges in using IPOP configuration is sharing the current between all modules. With a proper control scheme, both input current sharing (ICS) and output current sharing (OCS) between the modules can be achieved. Different control strategies have been discussed, but some can increase the magnetic component or even complicate it. Therefore, this work proposes a current sharing control strategy. The feasibility of the proposed control strategy for CLLC DAB modules has been verified initially using Matlab/Simulink. |
الرابط: | https://pure.qub.ac.uk/en/publications/current-sharing-with-dual-phase-shift-control-for-ipop-of-modular |
المؤتمر (3): | |
عنوان المؤتمر: | 23rd European Conference on Power Electronics and Applications |
تاريخ الإنعقاد: | 06-10/09/2021 |
مكان الإنعقاد: | Ghent. Belgium |
طبيعة المشاركة: | Oral presentation |
عنوان المشاركة: | A New DC-DC Converter Linking LCC-HVDC Transmission Networks |
ملخص المشاركة: | This paper introduces an LCC-DAB converter topology connecting two LCC networks. It utilizes IGCTs, hence, allows mimicking similar control and performance as in IGBT based VSC-DAB. IGCTs feature higher efficiency, higher short circuit current and higher power ratings. Analysis and simulations are provided confirming its potential in connecting LCC-HVDC networks. |
الرابط: | https://pure.qub.ac.uk/en/publications/a-new-dc-dc-converter-linking-lcc-hvdc-transmission-networks |