High frequency-link cycloconverters for medium voltage grid connection

Shattock, Nicholas (2014) High frequency-link cycloconverters for medium voltage grid connection. PhD thesis, University of Nottingham.

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As the deployment of renewable generation increases in the worldwide electrical grids, the development of distributed energy storage becomes more and more of an essential requirement. Energy storage devices connected at Medium Voltage allows for much higher powered deployments and this Ph.D. will focus on the power converter used to interface the energy storage device to the electrical grid.

Multi-level converters can be used to provide this interface without huge filtering requirements or the need of a Low Frequency step up transformer. However traditional Multi-level converter topologies require a large number of electrolytic capacitors, reducing the reliability and increasing the cost. Multi-level converters constructed from a Cycloconverter Topology do not require any additional electrolytic capacitors, however the High Frequency transformer, used to provide isolation has to be considerably larger.

This Ph.D. will investigate a novel hybrid converter topology to provide an interface between an energy storage device, such as a super-capacitor or battery, to the Medium Voltage grid, designed for high reliability and power density. This topology is called The Hybrid Cycloconverter Topology and is based on a Cycloconverter Topology connected to an auxiliary 3-Phase VSI.

A comprehensive simulation study is carried out to investigate the semiconductor losses of this novel converter topology and compared against two alternative topologies. An experimental converter is constructed to validate the theory of operation and to justify its effectiveness.

Item Type: Thesis (University of Nottingham only) (PhD)
Supervisors: Klumpner, C.
Asher, G.M.
Keywords: Electric current converters, energy storage, electric power transmission, equipment and supplies
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics
Faculties/Schools: UK Campuses > Faculty of Engineering > Department of Electrical and Electronic Engineering
Item ID: 14205
Depositing User: EP, Services
Date Deposited: 23 Dec 2014 11:29
Last Modified: 15 Dec 2017 05:53
URI: https://eprints.nottingham.ac.uk/id/eprint/14205

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