Robust controller design for a multilevel cascaded STATCOM

Author

Jovcic, D. ; Sternberger, R.

Author_Institution

Eng. Dept., Univ. of Aberdeen, Aberdeen

fYear

2008

fDate

20-24 July 2008

Firstpage

1

Lastpage

6

Abstract

In this paper, the controller robustness is studied for an indirect controlled cascaded-type based multi-level Static Synchronous Compensator (STATCOM) with ´square wave control´. The MATLAB based small-signal analytical model is used to perform eigenvalue analysis and to design controllers. Two different advanced control techniques are investigated and compared against the conventional method of proportional- integral (PI) feedback voltage control. The first strategy includes an additional current feedback, which shows minimal benefit. The second strategy considers a phase-lead compensation and indicates significantly shorter eigenvalue branches and improved robustness. The final results are confirmed with detailed nonlinear PSCAD simulation.

Keywords

control system analysis; control system synthesis; eigenvalues and eigenfunctions; robust control; static VAr compensators; MATLAB; current feedback; eigenvalue analysis; multilevel cascaded STATCOM; multilevel static synchronous compensator; phase-lead compensation; proportional- integral feedback voltage control; robust controller; square wave control; Analytical models; Automatic voltage control; Eigenvalues and eigenfunctions; Feedback; MATLAB; Performance analysis; Pi control; Proportional control; Robust control; Voltage control; Multilevel converter; STATCOM; controller studies; robustness studies; static VAR compensators;

fLanguage

English

Publisher

ieee

Conference_Titel

Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008 IEEE

Conference_Location

Pittsburgh, PA

ISSN

1932-5517

Print_ISBN

978-1-4244-1905-0

Electronic_ISBN

1932-5517

Type

conf

DOI

10.1109/PES.2008.4596689

Filename

4596689