A composite converter architecture for wind energy systems tied to an AC grid

As development of new wind turbines aim for higher output power, the doubly-fed induction generator (DFIG) is being replaced by the permanent magnet synchronous generator(PMSG). PMSGs have higher efficiency and torque density which enables compact, direct-drive wind turbines. However, these systems do not have the benefit of allowing power electronics to process partial power as a DFIG would. This thesis analyzes a composite converter architecture for tying PMSG-based wind energy conversion systems to an AC grid that reduces the use of high-frequency switches. The system is a partial power processing converter featuring two processing paths, both of which are fed by a multi-port PMSG. The first path comprises a passive rectifier and line-frequency inverter. The second path utilizes an active rectifier and inverter which employ pulse-width modulation. The two inverters drive either end of an open-winding transformer. The line-frequency path uses reliable, efficient, and inexpensive diodes and switches to process the majority of the power. The high frequency path uses high frequency switches but only processes 10% of the rated power at most. A design framework for minimizing switch rating shows a reduction in high frequency switch-VA rating by 68%. This results in an overall loss reduction ranging between 46.8% and 53% depending on the extracted power. Control and modulation strategies and a maximum power point tracking algorithm are presented. Experimental results obtained from a laboratory prototype validate the performance and the effectiveness of the proposed converter architecture, and its control and modulation strategies. The voltage ripple present in the two dc-links of this system and RMS current stress placed on the dc-link capacitors is quantified. This approach opens up opportunities for integrating ac-collection networks through an efficient, reliable, and cost-effective energy conversion system.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Electrical & Computer Engr

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2024

Author dc:creator

• Paximadas, Jason Orestis

Contributors dc:contributor

• Banerjee, Arijit

• Wind Energy Systems
• Permanent Magnet Synchronous Generator
• Multi-port Generator
• Open Winding Trans- Former
• Grid Connected System

Statement dc:rights

• Copyright 2024 Jason Paximadas

Language dc:language

en, eng

Handle dc:identifier

https://hdl.handle.net/2142/124469

OAI record oai:identifier

https://www.ideals.illinois.edu/oai-pmh?verb=GetRecord&metadataPrefix=etdms&identifier=oai%3Awww.ideals.illinois.edu%3A2142%2F124469