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

Abstract

Two different nonlinear control methodologies based robust Sliding Mode Control (SMC) for HVDC Light TM 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 © .

Optimal gain scheduling of VSC‐HVDC system sliding mode control via artificial bee colony and mine blast algorithms

“…Therefore, the novelty of this paper is mainly to employ two other different optimisation algorithms (ABC and MBA) to find the optimal gains that provide the dynamic behaviour with minimum steady-state error and less overshoot. Many authors have comprehensively illustrated the robust sliding mode controller for improving the dynamic behaviour of HVDC transmission scheme; the SMC given in [25][26][27][28][29][30][31] is illustrated and the proposed meta-heuristic approaches determine the optimal values of K 1 , K 2 , K 3 , and K 4 that are fed to the SMC. The structure of controller used with the inserted gains to be determined is shown in Fig.…”