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STABILITY ANALYSIS AND OPTIMAL CONTROL DESIGN FOR AC-DC POWER SYSTEM WITH CONSTANT POWER LOAD

Coulomb, Jean-Marc / J-M.C (2013) STABILITY ANALYSIS AND OPTIMAL CONTROL DESIGN FOR AC-DC POWER SYSTEM WITH CONSTANT POWER LOAD. Master's Thesis, University of Pittsburgh. (Unpublished)

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Abstract

This thesis studies the stability properties of an AC-DC system - a three-phase controlled
rectifi�er - with constant power load (CPL) and proposes an optimal design for the system
control. CPLs have been widely seen in power electronic applications. For example, motor
drives and DC/AC inverters in advanced automotive systems may behave as CPLs. Due to
their negative impedances, CPLs often impact the power quality and stability of an AC/DC
system. This thesis considers a typical AC/DC system with constant power load, where
the three-phase rectifi�er is originally controlled by two PI controllers. It is demonstrated
that the PI control strategy obtains narrow stability margin. To overcome the limitation
of PI control, a linear quadratic regulator with full state feedback is used to determine the
optimal structure of the controller and tune the parameters of the controller and DC �filter.
This method is shown to improve the stability margin of the AC-DC system tremendously.

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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Coulomb, Jean-Marc / J-M.Cjpc71@pitt.eduJPC71
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee CoChairMao, Zhi-Hongzhm4@pitt.eduZHM4
Committee CoChairReed, Gregorygfr3@pitt.eduGFR3
Committee MemberEl Nokali, Mahmoudmen@pitt.eduMEN
Committee MemberKusic, Georgegkusic@pitt.eduGKUSIC
Date: 31 January 2013
Date Type: Publication
Defense Date: 16 November 2012
Approval Date: 31 January 2013
Submission Date: 26 November 2012
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 59
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Electrical Engineering
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: Constant power load, stability, optimal control, lqr
Date Deposited: 31 Jan 2013 20:24
Last Modified: 15 Nov 2016 14:07
URI: http://d-scholarship.pitt.edu/id/eprint/16580

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