Authors: P.K. Dash, A.K. Moharana
Addresses: Postgraduate Studies and Research, Silicon Institute of Technology, Bhubaneswar-751024, India. ' Department of Electrical and Computer Engineering, University of Western Ontario, London-N6G 5E5, Canada
Abstract: In this paper, a state-space model for a voltage source converter based high voltage direct current (VSC HVDC) transmission link in parallel with an AC transmission line is developed using dq-coordinate system. A robust H∞ control design for the converter and inverter of the VSC HVDC system is proposed to maintain the DC voltage and control the active and reactive power at the converter stations. The H∞ control for the converter control systems is realised using output feedback control obtained by measuring the converter side DC voltage and reactive power, and the inverter side active and reactive power and satisfying the H∞ norm of the closed loop transfer function matrix. Simulation results with a large number of disturbances like torque changes and three-phase short circuits at the converter and inverter buses demonstrate the effectiveness of the designed controller and robustness with respect to the variations of the system operating conditions.
Keywords: voltage source converters; high voltage direct current; VSC HVDC; parallel AC lines; H-infinity control; robust control; feedback control; state-space modelling; AC transmission lines; converter control; simulation.
International Journal of Power and Energy Conversion, 2009 Vol.1 No.2/3, pp.215 - 242
Published online: 20 Aug 2009 *Full-text access for editors Access for subscribers Purchase this article Comment on this article