Chetty, Leon.Ijumba, Nelson Mutatina.2013-07-082013-07-0820132013Chetty, L., Ijumba, N.M. 2013. Quantitative Feedback Theory design of line current commutated HVDC control systems. South African Institute of Electrical Engineers 104 (1) pp. 2-10.1991-1696http://hdl.handle.net/10413/9267Line Current Commutated (LCC) HVDC systems consists of uncertain plants. These uncertainties are result of changes/disturbances in the ac networks or in the LCC HVDC system itself. Further uncertainties can be introduced due to simplified system modelling techniques. Quantitative Feedback Theory is a frequency-domain technique that utilises the Nichols chart to achieve a robust design over a specified region of uncertainty. The Quantitative Feedback Theory design philosophy was applied to design the LCC HVDC control system parameters. The stable start-up and step responses of the LCC HVDC system, for varying ac system conditions, conclusively validate the Quantitative Feedback Theory design method of the LCC HVDC control system parameters.en-ZAQuantitative feedback theory.Electric power systems.Electric power systems--Control.Robust control.HVDC control systems.Peer reviewed journal article