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Okunola, Abdullah Akolade (2024) Internal energy control of a cascaded H-Bridge Energy Router. PhD thesis, University of Nottingham.

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Abstract

Energy efficiency is an important requirement in industry. Across several industrial applications, it is desired that maximum output is achieved for a given energy input. At material processing sites, several energy-intensive processes that are powered individually from generators run in various sequences, but the minimum amount of energy should be used. Power electronic converters can be used to improve energy efficiency at such sites by energising these processes from a single AC power supply source to minimise inefficiency.

As such industrial processes are independent, it is essential to apply a power electronic converter topology with a cellular and modular structure to facilitate independent application of the industrial processes across the cells of the converter. The Cascaded H-Bridge converter is suitable for this consideration.

With the independence of the industrial processes, unbalanced loading of the converter is expected. It is thus vital to develop the control of the converter to ensure that power from the AC supply source is used to meet the demands of the respective processes. This will ensure sustained operation of the converter and the site.

Unbalanced loading of the Cascaded H-Bridge converter has been thoroughly examined in this project. Unbalance limits are derived for unity power factor operation of the converter at the source. These are then extended with non-unity power factor operation, although this is generally undesirable. Closed-loop control is then developed and implemented for the converter.

The converter is simulated and subsequently tested experimentally on a rig developed during the project to validate the analytical expressions derived and the control scheme implemented. Simulation and experimental testing show satisfactory outcomes that validate the developed analytical and control concepts.

Item Type:	Thesis (University of Nottingham only) (PhD)
Supervisors:	Watson, Alan James Clare, Jonathan Charles
Keywords:	Cascaded H-Bridge (CHB) converter, energy router, AC/DC converter, cell voltage balancing, asymmetric loading, unbalanced loading
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Faculties/Schools:	UK Campuses > Faculty of Engineering > Department of Electrical and Electronic Engineering
Item ID:	78116
Depositing User:	OKUNOLA, AKOLADE
Date Deposited:	18 Jul 2024 04:40
Last Modified:	18 Jul 2024 04:40
URI:	https://eprints.nottingham.ac.uk/id/eprint/78116

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