VSC based HVDC Transmission System using Adaptive FPI Controller

High Voltage DC (HVDC) is an established technology in the power sector for the past few decades and also needs to be a vital tool in the design of future smart and microgrid scenarios. However, the control strategy of Voltage Source Converter (VSC) based HVDC needs to be established for its better operational performance. This paper presents a novel Adaptive Fractional Order PI (AFPI) based controller against the conventional PI controller to enhance the stability with better damping of oscillations. The parameters of the FPI have a critical influence on the performance of the controller and to set it optimally Teaching-Learning based Optimizer (TLBO) is suggested. Detailed modeling and design of LCL filters are presented with frequency domain analysis. Comparative results for the proposed approach are illustrated under different conditions to justify its improved performance and robustness with better stability.