Coordinated Control of TCSC and SVC for System Damping Enhancement

  • So Ping Lam (Centre for Advanced Power Electronics, School of Electrical and Electronic Engineering, Nanyang Technological University) ;
  • Chu Yun Chung (Centre for Advanced Power Electronics, School of Electrical and Electronic Engineering, Nanyang Technological University) ;
  • Yu Tao (Centre for Advanced Power Electronics, School of Electrical and Electronic Engineering, Nanyang Technological University)
  • Published : 2005.06.01

Abstract

This paper proposes a combination of the Thyristor Controlled Series Capacitor (TCSC) and Static Var Compensator (SVC) installation for enhancing the damping performance of a power system. The developed scheme employs a damping controller which coordinates measurement signals with control signals to control the TCSC and SVC. The coordinated control method is based on the application of projective controls. Controller performance over a range of operating conditions is investigated through simulation studies on a single-machine infinite-bus power system. The linear analysis and nonlinear simulation results show that the proposed controller can significantly improve the damping performance of the power system and hence, increase its power transfer capabilities. In this paper, a current injection model of TCSC is developed and incorporated in the transmission system model. By using equivalent injected currents at terminal buses to simulate a TCSC no modification of the bus admittance matrix is required at each iteration.

Keywords

References

  1. J. J. Sanchez-Gasca, 'Coordinated control of two FACTS devices for damping interarea oscillations,' IEEE Trans. on Power Systems, vol 13, no. 2, pp. 428-434, May 1998
  2. S. K. Tso, J. Liang, Q. Y. Zeng, K. L. Lo, and X. X. Zhou, 'Coordination of TCSC and SVC for stability improvement of power systems,' Proc. of the IEE International Conference on Advances in Power System Control, Operation and Management, Hong Kong, pp. 371-376, November 1997
  3. J. H. Chow, Cherry Tree Scientific Software: Power System Toolbox, ver. 2.0, 1997
  4. J. P. Paserba, N. W. Miller, E. V. Larsen, and R. J Piwko, 'A thyristor controlled series compensation model for power system stability analysis,' IEEE Trans. on Power Delivery, vol. 10, no. 3, pp.1471-1478, July 1995
  5. E. V. Larsen and J. H. Chow, 'SVC control concepts for system dynamic performance,' Applications of Static Var Systems for System Dynamic Performance, IEEE Publication 87THOI87-5-PWR, 1987
  6. W. E. Hopkins, J. Medanic, and W. R. Perkins, 'Output feedback pole placement in the design of suboptimal linear quadratic regulators,' International Journal of Control, vol. 34, pp. 593-612, 1981
  7. J. Medanic and Z. Uskokovic, 'Design of optimal output regulators for linear multi variable systems with constant disturbances,' International Journal of Control, vol. 37, pp. 809-830,1983
  8. J. Medanic and Z. Uskokovic, 'Design of decentralized static and low-order dynamic regulators for large scale systems,' Conference on Decision and Control, San Antonio, U.S.A., December 1983
  9. D. Amautovic and J. Medanic, 'Design of decentralized multi variable excitation controller in multimachine power systems by projective controls,' IEEE Trans. on Energy Conversion, vol. EC-2, no. 4, pp. 598-604, 1987