Type of Document Dissertation Author Barbosa, Peter Mantovanelli Author's Email Address firstname.lastname@example.org URN etd-08142002-075617 Title Three-Phase Power Factor Correction Circuits for Low-Cost Distributed Power Systems Degree PhD Department Electrical and Computer Engineering Advisory Committee
Advisor Name Title Lee, Fred C. Committee Chair Boroyevich, Dushan Committee Member Chen, Dan Y. Committee Member Kohler, Werner E. Committee Member Lindner, Douglas K. Committee Member Keywords
- front-end converters
- interleaved converters
- distributed power systems
- three-phase rectifiers
Date of Defense 2002-07-31 Availability unrestricted AbstractFront-end converters with power factor correction (PFC) capability are widely used in distributed power systems (DPSs). Most of the front-end converters are implemented using a two-stage approach, which consists of a PFC stage followed by a DC/DC converter. The purpose of the front-end converter is to regulate the DC output voltage, supply all the load converters connected to the distributed bus, guarantee current sharing, and charge a bank of batteries to provide backup energy when the power grid breaks down.
One of the main concerns of the power supply industry is to obtain a front-end converter with a low-cost PFC stage, while still complying with required harmonic standards, especially for high-power three-phase applications. Having this statement in mind, the main objective of this dissertation is to study front-end converters for DPS applications with PFC to meet harmonic standards, while still maintaining low cost and performance indices.
To realize the many aforementioned objectives, this dissertation is divided into two main parts: (1) two-stage front-end converters suitable for telecom applications, and (2) single-stage low-cost AC/DC converters suitable for mainframe computers and server applications. The use of discontinuous conduction mode (DCM) boost rectifiers is extensively explored to achieve simplicity, while reducing the cost for DPS applications. Interleaving of DCM boost rectifiers is also explored as an alternative approach to further reduce the system cost by reducing the filtering requirements. All the solutions discussed are implemented for 3kW applications, while 6kW is obtained by interleaving two converters.
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