Comprehensive optimization and practical design of power electronic systems under multiple competing performance demands

Kuai, Yingying

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https://hdl.handle.net/2142/34449 Copy

Description

Title

Comprehensive optimization and practical design of power electronic systems under multiple competing performance demands

Author(s)

Kuai, Yingying

Issue Date

2012-09-18T21:17:45Z

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

Chapman, Patrick L.

Doctoral Committee Chair(s)

Chapman, Patrick L.

Committee Member(s)

• Krein, Philip T.
• Domínguez-García, Alejandro D.
• Chen, Deming

Department of Study

Electrical & Computer Eng

Discipline

Electrical & Computer Engr

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

• Voltage Regulator
• Voltage Sourced Inverter
• Optimization
• Model Simplification
• Linear Regression
• LCL Filter
• Optimal Design

Abstract

Balancing trade-offs between several requirements, such as cost, steady-state performance, transient response, and efficiency is a constant theme in power electronic systems design. This project develops a comprehensive optimization approach to design the power stage and feedback controller simultaneously and achieve practical solutions that are ready to implement. The study is presented through the context of voltage regulator (VR) and voltage sourced inverter (VSI) design, both of which exemplify power electronic systems under several competing performance demands. A single-objective, multi-constraint structure ensures that all specifications are treated with equal priority, and that no pass-or-fail specification is unnecessarily optimized. To maximize the probability of reaching optimality and to obtain a systematic synthesis of system response with respect to parameters, it is proposed to consider a maximum number of major parameters as design variables, with a minimal number of preset constants, and to incorporate power circuit and controller model into one comprehensive model. Component parameters are considered discrete and defined by a database. Special challenges to implement the proposed optimization scheme, such as a large and discrete variable space and a model that contains discontinuous and indifferentiable functions, are solved by using stochastic search methods such as genetic algorithms (GA), and model simplification by linear regression. Two optimization schemes are proposed with different allocations of computational complexity, human expertise, and stochastic uncertainty. They provide flexibility for practical designers to optimize a system according to specific requirements and situations. Extensive modeling is performed for both the VR and VSI systems. Model simplification by linear regression is investigated. Detailed guidelines are described with definitions of regression parameters. Regression errors are analyzed and satisfactory accuracy is achieved by optimizing parameters using GA. Case studies for VR and VSI design using the two proposed schemes are discussed. Improved design solutions and shortened optimization processing time are achieved. Informative analysis treating the optimization system together with the database is presented.

Graduation Semester

2012-08

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http://hdl.handle.net/2142/34449

Copyright and License Information

Copyright 2012 Yingying Kuai

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