Coulomb, Jean-Marc
(2013)
STABILITY ANALYSIS AND OPTIMAL CONTROL DESIGN FOR AC-DC POWER SYSTEM WITH CONSTANT POWER LOAD.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
This thesis studies the stability properties of an AC-DC system - a three-phase controlled rectifier - 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 rectifier 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Unpublished |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: |
|
| ETD Committee: |
|
| 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: |
19 Jul 2024 18:36 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/16580 |
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