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

Paximadas, Jason Orestis

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

Description

Title

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

Author(s)

Paximadas, Jason Orestis

Issue Date

2024-05-03

Director of Research (if dissertation) or Advisor (if thesis)

Banerjee, Arijit

Department of Study

Electrical & Computer Eng

Discipline

Electrical & Computer Engr

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

Wind Energy Systems, Permanent magnet synchronous generator, Multi-port generator, Open winding trans- former, Grid connected system

Abstract

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.

Graduation Semester

2024-05

Type of Resource

Thesis

Copyright and License Information

Copyright 2024 Jason Paximadas

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