Title :
Robust control of a VSC HVDC terminal attached to a weak AC system
Author :
Farag, Adel ; Durrant, Martyn ; Werner, Herbert ; Abbott, Keith
Author_Institution :
Control Eng. Inst., Tech. Univ. Hamburg-Harburg, Hamburg, Germany
Abstract :
In this paper a robust controller for a voltage source converter high voltage direct current (VSC HVDC) transmission system is designed. The dynamic behaviour of the power controlling terminal of VSC HVDC transmission varies with the impedance of the attached AC system and the power flow across the DC link. A single controller is sought to provide the performance across a range of operating conditions. First, a linear fractional transformation (LFT) uncertainty model is constructed from a set of linearised models using a technique based on the singular value decomposition. The controller is then designed using a new iterative algorithm which has low conservatism. The controller is obtained by solving a linear matrix inequality (LMI) problem for which efficient solvers are available. The method produces a successful design: numerical simulation confirms the achievement of realistic control objectives for the nominal model, and an acceptable robust performance for all operating conditions.
Keywords :
AC-DC power convertors; HVDC power transmission; iterative methods; linear matrix inequalities; power control; power transmission control; robust control; singular value decomposition; AC systems; DC link; HVDC; LMI; high voltage direct current transmission system; iterative algorithm; linear fractional transformation; linear matrix inequality; linearised model; low conservatism; power control terminal; realistic control objectives; robust control; singular value decomposition; uncertainty model; voltage source converter; Control systems; Converters; HVDC transmission; Impedance; Load flow; Power conversion; Power system modeling; Robust control; Uncertainty; Voltage control;
Conference_Titel :
Control Applications, 2003. CCA 2003. Proceedings of 2003 IEEE Conference on
Print_ISBN :
0-7803-7729-X
DOI :
10.1109/CCA.2003.1223287