Title: Dynamic stability improvement for VSC-HVDC-based inter connected power system using modified sliding mode controller

Authors: Niranjan Nayak; Tanmoy Parida; Pravat Kumar Rout; Irani Majumder; Sangram K. Routray

Addresses: Electrical and Electronics Department, Siksha 'O'Anusandhan University, Bhubaneswar, Odisha, India ' Department of Electrical Engineering, Siksha 'O'Anusandhan University, Bhubaneswar, Odisha, India ' Department of Electrical and Electronics Engineering, Siksha 'O'Anusandhan University, Bhubaneswar, Odisha, India ' Department of Electrical Engineering, Siksha 'O'Anusandhan University, Bhubaneswar, Odisha, India ' Department of Electrical and Electronics Engineering, Siksha 'O'Anusandhan University, Bhubaneswar, Odisha, India

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.

Keywords: VSC-HVDC; voltage source converters; VSC; high voltage direct current; HVDC; IMC-based PI control; internal model control; dynamic stability; interconnected power systems; modified SMC; sliding mode control; nonlinear control; controller design; simulation.

DOI: 10.1504/IJAAC.2017.083303

International Journal of Automation and Control, 2017 Vol.11 No.2, pp.188 - 206

Received: 26 Jan 2016
Accepted: 07 May 2016
Published online: 23 Mar 2017 *

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