Bidirectional resonant chargers for e-mobility
department or school: Applied Science, Faculty of
department or school: Electrical and Computer Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Min, Jun
issued: 2023-10-24T15:59:01Z
issued: 2023
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: This thesis investigates the development of efficient bidirectional chargers, an integral component for advancing e-mobility. Electric vehicles (EVs), energized by renewable sources, could mitigate the power grid instability by returning stored energy when renewables are less available. Battery voltage in EVs, however, can vary widely based on the EV's application and its battery's State of Charge (SoC). This necessitates employing various bidirectional charger techniques that can handle a broad range of EV battery voltages when connected to the renewable energy grid. Three innovative techniques are proposed. Firstly, this work introduces the Asymmetric Parameters Methodology (APM), a technique that enables the design of asymmetric resonant tanks in bidirectional resonant CLLC DC/DC stages. APM, optimized through a statistical Design of Experiments (DoE) approach, results in a narrower bidirectional switching frequency range, reduced component current stress, and smaller transformer size. The second technique is a unified bidirectional resonant frequency tracking method for the CLLC DC/DC stage of battery chargers, which decreases bidirectional resonance tracking costs and complexity while enhancing efficiency under parameter deviations. It is based on the discovery of two interesting features of the CLLC converters: one, the maximum efficiency for charging and discharging modes occurs at a variable but bidirectionally identical resonant frequency. Two, the voltages at both ends of the resonant tank remain in phase at this frequency for bidirectional operations. This thesis introduces a third technique: a cascaded half-bridge-based multi-level multi-port bridgeless PFC rectifier for the AC/DC stage of chargers. Suitable for low-voltage battery charging, this technique divides high-voltage DC bus voltage into multiple low-voltage ports for the following CLLC DC/DC converter stage. This allows the transformer ratio of the DC/DC converter stage to be designed close to …
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/84852
note: Bidirectional Resonant Chargers for E-MobilitybyJun MinM. Eng., Hunan University, 2018B. Eng., Hunan Institute of Engineering, 2014A THESIS SUBMITTED IN PARTIAL FULFILLMENTOF THE REQUIREMENTS FOR THE DEGREE OFDoctor of PhilosophyinTHE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES(Electrical & Computer Engineering)The University of British Columbia(Vancouver)June 2023© Jun Min, 2023The following individuals certify that they have read, and recommend to the Faculty of Graduateand Postdoctoral Studies for acceptance, the thesis entitled:Bidirectional Resonant Chargers for E-Mobilitysubmitted by Jun Min in partial fulfillment of the requirements forthe degree of Doctor of Philosophyin Electrical and Computer EngineeringExamining Committee:Dr. Martin Ordonez, Professor, Electrical and Computer Engineering, UBCSupervisorDr. Juri Jatskevich, Professor, Electrical and Computer Engineering, UBCSupervisory Committee MemberDr. Navid Shafiei, Senior Power Supply Design Engineer, EnerSysSupervisory Committee MemberDr. Shahriar Mirabbasi, Professor, Electrical and Computer Engineering, UBCUniversity ExaminerDr. Curtis Berlinguette, Professor, Chemical and Biological Engineering, UBCUniversity ExamineriiAbstractThis thesis investigates the development of efficient bidirectional chargers, an integral componentfor advancing e-mobility. Electric vehicles (EVs), energized by renewable sources, could mitigatethe power grid instability by returning stored energy when renewables are less available. Batteryvoltage in EVs, however, can vary widely based on the EV’s application and its battery’s State ofCharge (SoC). This necessitates employing various bidirectional charger techniques that can handlea broad range of EV battery voltages when connected to the renewable energy grid.Three innovative techniques are proposed. Firstly, this work introduces the Asymmetric Pa-rameters Methodology (APM), a technique that enables the design of asymmetric resonant tanks inbidirectional resonant CLLC DC/…
has type: Thesis/Dissertation
date issued: 2023-11
is shown at: 10.14288/1.0433122
language: eng
degree discipline: Electrical and Computer Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Ordonez, Martin
type: Text
identifier URI: http://hdl.handle.net/2429/84852