Synthesis of sliding and integral sliding mode controllers for the VSC-HVDC transmission link

This paper introduces a mathematical model for VSC-HVDC transmission link with two non-linear control strategies, namely Sliding Mode Control (SMC) and Integral Sliding Mode Control (ISMC). Sliding mode control is invariably used to address control problems in non-linear systems. The main drawback of sliding mode based approach is chattering. To reduce chattering and to minimize the steady state error an Integral Sliding Mode Controller is proposed. The proposed controller shows better performance when subjected to different operating conditions, such as robustness and insensitivity to parameter variations, power reversal, fault condition, chattering detection etc. All the above simulations are carried out under MATLAB/SIMULINK.