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Title: Single phase grid connected power converter topologies with power pulsation compensation
Author: Gottardo, Davide
ISNI:       0000 0004 9355 065X
Awarding Body: University of Nottingham
Current Institution: University of Nottingham
Date of Award: 2020
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Following the ever increasing penetration of grid connected distributed generation, EVs battery chargers, and distributed energy storage systems, the requirement for power converter having rated power ranging from 1 to 15kW is rising. In order to facilitate the introduction of power converters in residential application, \red{including single-phase systems}, high power density is desirable, as long as it does not have significant negative impact on cost and reliability. The topic of this work is the implementation of new topologies for single phase AC-DC systems. In the first part of the work, a literature review of existing solutions is presented, with focus on active ripple power decoupling and leakage current elimination in transformerless PV systems. \red{Two converter topologies, the Double-Full-Bridge Converter (DFBC) and the Jumping-Capacitor Converter (JCC) are proposed, both able to achieve active ripple power cancellation using the concept of ripple port. The JCC particularly suitable for use as transformerless PV converter, thanks to its leakage currents filtering capability.} A new modulation technique capable of achieving zero voltage switching without the need for resonating LC circuits is proposed. \red{The modulation takes advantage of the mutual coupling between the magnetic elements of different fundamental cells in order to shape the current ripple waveforms, achieving ZVS with a low ripple amplitude.} The technique can be applied to the proposed topologies but also on many other topologies. The proposed solutions are validated by simulations and experimental results.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: TK3001 Distribution or transmission of electric power