Research Article Open Access

Decentralized Controller Design for Static Synchronous Compensator Using Robust Quantitative Feedback Theory Method

Seyed Abbas Taher1, Reza Hematti1, Ali Abdolalipour1 and Majid Nemati1
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American Journal of Engineering and Applied Sciences
Volume 1 No. 1, 2008, 66-75

DOI: https://doi.org/10.3844/ajeassp.2008.66.75

Submitted On: 25 April 2008 Published On: 31 March 2008

How to Cite: Taher, S. A., Hematti, R., Abdolalipour, A. & Nemati, M. (2008). Decentralized Controller Design for Static Synchronous Compensator Using Robust Quantitative Feedback Theory Method . American Journal of Engineering and Applied Sciences, 1(1), 66-75. https://doi.org/10.3844/ajeassp.2008.66.75

Abstract

The Static Synchronous Compensator (STATCOM) provides shunt compensation in similar way to the Static VAR Compensator (SVC) but utilizes a voltage source converter rather than capacitors and reactor. In practice systems use simple Proportional-Integral (PI) controllers for control of STATCOM. However, since the PI control parameters were usually tuned based on classical or trial-and-error approaches, they were incapable of obtaining good dynamic performance for a wide range of operation conditions and various loads in power system. For this problem, in this research a robust control approach based on the Quantitative Feedback Theory (QFT) method was proposed for the design of STATCOM controllers (AC-voltage regulator and DC-voltage regulator) and also supplementary damping controller for increase of power system oscillations damping is developed. A Single-Machine Infinite-Bus (SMIB) power system installed with a STATCOM with system parametric uncertainties were considered for case study. The system parametric uncertainties were obtained by changing parameters and load by 45% simultaneously from their typical values. To show effectiveness of QFT method, the proposed method is compared with a conventional method (classical P-I controller optimized by Genetic Algorithm (GA)). Several linear and non-linear time-domain simulation tests visibly show the validity of proposed method in compare with traditional method.

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Keywords

  • Flexible AC transmission systems
  • static synchronous compensator
  • power system oscillations
  • quantitative feedback theory
  • decentralized control