Design of a New Nonlinear Fuzzy State Feedback Controller for HVDC Systems


Najafi, H. R. and Robinson, F., 2006. Design of a New Nonlinear Fuzzy State Feedback Controller for HVDC Systems. In: Industrial Electronics and Applications, 2006 1ST IEEE Conference on, 2006-01-01.

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This paper deals with design and stability of a newnonlinear fuzzy state feedback controller for HVDCsystems. A novel simplified nonlinear dynamic model isdeveloped for HVDC system that can be used to designthe controller. The proposed nonlinear dynamic modeldecomposes into several linear systems around its importantequilibrium points. These local linear modelsdescribe the plant dynamical behavior at its differentoperating points. The proposed controller is used in thecontrol loops of the HVDC system. The simulation iscarried out based on the Cigré benchmark model. Simulationresults show improvement of overall AC/DC/ACsystem performance when severe faults occur, comparedto the conventional controller. Also, the stable behaviorof a very weak AC/DC system (SCR<2) with proposedcontroller is very significant when a sudden change incurrent order and/or a switched reduction in ESCR isapplied. The same situation with conventional controlbrings the system into unstable region.


Item Type Conference or Workshop Items (Paper)
CreatorsNajafi, H. R.and Robinson, F.
DepartmentsFaculty of Engineering & Design > Electronic & Electrical Engineering
ID Code5791


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