A robust stabilizing nonlinear control design for VSC-HVDC systems: A comparative study

VSC-HVDC transmission systems may overcome some unexpected stochastic time variant (STV) parameters uncertainties such as frequency disadjustments and cable parameters uncertainties inherent with AC grids. This paper first presents a mathematical modeling of VSC-HVDC transmission systems. These systems exhibit a nonlinear character, and therefore, two different methodologies for robust nonlinear controllers design based on Asymptotic Output Tracking (AOT) and the Sliding Mode Control (SMC) techniques are investigated to control theVSC-HVDC transmission systems submitted to network nonlinearities introduced by requirements to power flow and line voltage. Robust stabilizing feedback control laws are formulated to govern the DC link voltage and to control the active and reactive powers under STV parameters uncertainties. Both kinds of robust nonlinear controllers are demonstrated and compared through simulation studies on the VSC-HVDC transmission systems using MATLAB©-Simulink software. Dealing with systems of high power ratings up to 300 MW, based on this comparison, the simulation results significantly clarify the controllers robustness and the control flexibility towards improving the system's dynamic behaviour and enhancing the system's stability under STV parameters uncertainties. Regarding the economical feasibility and the relative structural simplicity, the superiority of the controller based AOT over that of the SMC controller is pointed out.

[1]  Luonan Chen,et al.  Stability analysis for digital controls of power systems , 2000 .

[2]  Gregory F. Reed,et al.  Advantages of voltage sourced converter (VSC) based design concepts for FACTS and HVDC-link applications , 2003, 2003 IEEE Power Engineering Society General Meeting (IEEE Cat. No.03CH37491).

[3]  Rong-Jong Wai,et al.  A comparative study of sliding mode and model reference adaptive speed observers for induction motor drive , 1998 .

[4]  V. G. D. C. Samarasinghe.  Stabilization of a multi-machine power system using nonlinear robust variable structure control , 1997 .

[5]  Newton G. Bretas,et al.  Linear matrix inequality based controller design with feedback linearisation: application to power systems , 2003 .

[6]  Ying Jiang-Hafner,et al.  Improvement of subsynchronous torsional damping using VSC HVDC , 2002, Proceedings. International Conference on Power System Technology.

[7]  Lennart Söder,et al.  Active and reactive power control of a VSC-HVdc , 2008 .

[8]  John Y. Hung,et al.  Variable structure control: a survey , 1993, IEEE Trans. Ind. Electron..

[9]  S. M. Badran,et al.  Design of modulation controllers for AC/DC power systems , 1993 .

[10]  Jos Arrillaga,et al.  High voltage direct current transmission , 1998 .

[11]  A. K. David,et al.  Multivariable adaptive control of AC-DC systems , 1994 .

[12]  Chen Chen,et al.  Feedback stabilization for AC/DC power system with nonlinear loads , 2005 .

[13]  Y.-Y. Hsu,et al.  Damping of a parallel AC-DC power system using PID power system stabilizers and rectifier current regulators , 1988 .

[14]  Adel A. Ghandakly,et al.  A parametrically optimized self-tuning regulator for power system stabilizers , 1992 .

[15]  Zheng Xu,et al.  A control strategy for three-level VSC-HVDC system , 2002, IEEE Power Engineering Society Summer Meeting,.

[16]  Abdelkrim Benchaib,et al.  Analysis of a robust DC-bus voltage control system for a VSC transmission scheme , 2001 .

[17]  A. Sannino,et al.  Analysis of the control algorithms of voltage-source converter HVDC , 2005, 2005 IEEE Russia Power Tech.

[18]  L. Weimers.  New markets need new technology , 2000, PowerCon 2000. 2000 International Conference on Power System Technology. Proceedings (Cat. No.00EX409).

[19]  M. Petit,et al.  Robust nonlinear control strategy for HVDC light transmission systems technology , 2008, 2008 34th Annual Conference of IEEE Industrial Electronics.

[20]  Lars Stendius,et al.  HVDC Light An excellent tool for City Center Infeed , 1999 .

[21]  Sven Sahle,et al.  Towards a second cybernetics model for cognitive systems , 2002 .

[22]  D. Hill,et al.  Nonlinear output stabilization control for multimachine power systems , 2000 .

[23]  Ming-Jyi Jang,et al.  Sliding mode control of hyperchaos in Rössler systems , 2002 .

[24]  D. Grant Fisher,et al.  Continuous sliding mode control , 1992 .

[25]  M. Petit,et al.  On the robustness of VSC-HVDC systems controllers under parameters uncertainties , 2008, 2008 40th North American Power Symposium.

[26]  Dragan Jovcic,et al.  Novel current controller design for elimination of dominant oscillatory mode on an HVDC line , 1999 .