Adaptive Observer-Based Decentralized Scheme for Robust Nonlinear Power Flow Control Using HPFC

Document Type : Research paper

Authors

1 Department of Electrical and Computer Engineering, University of Tabriz, Tabriz,Iran

2 School of Engineering, University of British Columbia

Abstract

This paper investigates the robust decentralized nonlinear control of power flow in a power system using a new configuration of UPFC. This structure comprises two shunt converters and one series capacitor called as hybrid power flow controller (HPFC). A controller is designed via control Lyapunov function (CLF) and adaptive observer to surmount the problems of stability such as tracking desired references, robustness against uncertainties, rejecting the disturbances, and remote data estimation. The suggested control scheme is decentralized using adaptive observer to estimate the non-local varying parameters of the system. Stability of the closed loop system is proved mathematically using Lyapunov stability theorem. Performance of the proposed finite-time controller (FT-C) is compared to another suggested exponentially convergent nonlinear controller (ECN-C) and a conventional PI controller (PI-C). Settling time of the state variables are diminished to a known little time by FT-C in comparison with ECN-C and PI-C. Simulation results are given to validate the proposed controllers. Effects of model uncertainties such as parameter variation in the transmission line and the converters are studied and properly compensated by the proposed controllers. The impact of the control gain and the communication time-delay is shown using the Bode diagram analysis.

Keywords

Main Subjects

References

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Journal of Operation and Automation in Power Engineering
Volume 5, Issue 2
December 2017
Pages 191-203

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History

  • Receive Date: 12 November 2016
  • Revise Date: 15 March 2017
  • Accept Date: 20 April 2017
  • First Publish Date: 01 December 2017

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