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Two different nonlinear control methodologies based robust Sliding Mode Control (SMC) for HVDC Light transmission system’s possessing parameters uncertainties are proposed. Appropriate feedback signals are formulated to control the active and reactive powers towards their specified set point values and to govern the DC link voltage to its desired value. The first controller maintains the active and reactive powers to their anticipated rated values using their corresponding reference signals directly. The other uses an additional auxiliary controller based proportional-integral (PI) controller or the two degrees of freedom proportional-integral-derivative (2DOF-PID) controller to govern the DC voltage and to generate the necessary direct and quadrature currents reference signals that are inserted to the main controller based SMC in order to control the corresponding powers. The controllers’ gains are adjusted using Lyapunov method to guarantee zero tracking error in order to ensure the system’s stability. The feasibility and effectivity of both control techniques are evaluated in terms of performance enhancement and their robustness are compared under parameters uncertainties and verified for different DC link lengths using MATLAB.

Nonlinear Control based Sliding Modes for HVDC Light System Behavioral Enhancement under Parameters Uncertainties