Abstract
This paper presents a comparative study of robust nonlinear controller based on sliding mode control theory and internal model controller-based PI for VSC-HVDC transmission system. A modified sliding mode controller or 'SAT' is used to handle the uncertainties and enhance the system performance, under various disturbance conditions. The new sliding mode control compensates the influence of dynamics and chattering phenomena on the system response. It also improves the robustness of the reaching phase of the modified sliding mode control. The effectiveness of the proposed controllers is demonstrated through digital simulation studies using MATLAB/SIMULINK software package. The simulation results demonstrate that the proposed controller contribute appreciably towards improving the damping behaviour of the VSC-HVDC system under various disturbances compare to conventional PI and IMC-based PI controller.
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