A cost effective digital synchronous controller : For bi-directional IPT systems

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dc.contributor.advisor Thrimawithana, D en
dc.contributor.author Singh, Jagmeet en
dc.date.accessioned 2018-01-16T23:33:19Z en
dc.date.issued 2017 en
dc.identifier.uri http://hdl.handle.net/2292/36845 en
dc.description Full text is available to authenticated members of The University of Auckland only. en
dc.description.abstract Vehicle to Grid (V2G) applications are a solution to the ever-growing concerns of climate change and the effect of fossil fuels on the environment. V2G are environmentally friendly and sustainable systems which store excessive energy generated by the utility grid in an Electric Vehicle (EV). Consequently, to implement a V2G system, bi-directional power transfer between the grid and an EV is required. Due to the safe, reliable and cost-efficient nature of Inductive Power Transfer (IPT), bidirectional IPT (BD-IPT) systems are particularly becoming a preferred method for V2G applications. A BD-IPT system consists of a primary side and a secondary side, which transfer power amongst each other through the laws of electromagnetics. A study using the mathematical model of an Inductor-Capacitor-Inductor (LCL) tuned BD-IPT system showed that for optimal power transfer, the primary and secondary side must operate at the same frequency and synchronously with each other. This is easily achieved by employing wireless communications, however these add additional cost and reduce the robustness of the system. Therefore, several power regulation and synchronization techniques proposed in the past were studied. It was concluded that these methods have disadvantages in the form of cost inefficiency, high digital computational load and unreliable operation under unideal operating conditions. This thesis therefore presents a solution to the problems mentioned above by proposing a cost effective digital synchronous controller. The digital synchronous controller allows the system to operate at optimum conditions by regulating the real and reactive powers produced on the secondary side of a BD-IPT system. The secondary side is operated in phase and frequency synchronization with the primary side by ensuring the reactive power produced is minimised. While the magnitude of the output power flow is regulated by altering the duty cycle of the secondary side’s input voltage and thus its magnitude. To verify its performance, the digital synchronous controller was simulated on a 1.2kW BD-IPT system under tuned and detuned conditions. The results confirm the controller to be robust and easy to implement. To verify these theoretical results the controller was also implemented on a 1.2 kW prototype BD-IPT system. The results again verified that the proposed controller is robust. The digital synchronous controller has many advantages over the methods proposed in the past. It is extremely cost efficient, able to be utilised in all power level BD-IPT systems, employs simple digital control logic and performs robustly under unideal conditions. en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof Masters Thesis - University of Auckland en
dc.relation.isreferencedby UoA99264959614002091 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights Restricted Item. Available to authenticated members of The University of Auckland. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.rights.uri http://creativecommons.org/licenses/by-nc-sa/3.0/nz/ en
dc.title A cost effective digital synchronous controller : For bi-directional IPT systems en
dc.type Thesis en
thesis.degree.discipline Engineering en
thesis.degree.grantor The University of Auckland en
thesis.degree.level Masters en
dc.rights.holder Copyright: The author en
pubs.elements-id 721168 en
pubs.record-created-at-source-date 2018-01-17 en


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