A Feedback Linearization Based Control Strategy for VSC-HVDC Transmission Converters
نویسندگان
چکیده
In this paper, a global stability and robust nonlinear controller for VSC-HVDC transmission Converters applying input-output linearization (IOL) techniques is proposed. The feedback linearization based nonlinear differential-geometric techniques is used to cancel nonlinearities and decouple the input control variables. Global tracking capability with zero steady-state error of the voltage loop has been achieved by zero-dynamic control. Also, there is no derivative calculation required and measurement of load current is not needed. The proposed controller is of many advantages compared with the traditional control strategies, such as global stability, fast dc-bus voltage response, robust against parameter uncertainties and decoupled dynamical d-q current loops. Comprehensive time-domain computer simulations within MATLAB/SIMULINK have been carried out to confirm the proposed control scheme. Key-Words: Voltage-Source Converters (VSC)-HVDC; Nonlinear Control; Feedback Linearization; Input-Output Linearization (IOL); Differential-Geometric
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