1Assistant Professor, Department of Electrical Engineering, ITER, SOA (deemed to be) University
2Associate Professor, Department of Electrical Engineering, ITER, SOA (deemed to be) University
*Corresponding Author: Tanmoy Parida Assistant Professor, Department of Electrical Engineering, ITER, SOA (deemed to be) University Email: tanmoyparida@soa.ac.in
Online published on 21 January, 2019.
High voltage DC (HVDC) transmission have controllable quality with potential for towards power system stability. This paper presents the methodology to analyze the stability and robustness characteristicsof VSC-HVDC controls in a multi machine power system over several operating conditions. The dynamics of VSC-HVDC is formulated using synchronous reference.i.e., d-q axis model. Fuzzy logic and sliding mode controller are used to cancel nonlinearity and offers invariant stability to model uncertainties pertaining due to various disturbances in the system such as fault at converter bus, change in the short circuit ratio and voltage reduction at DC bus. The efficiency of the proposed sliding mode controller is validated via simulation tool using MATLAB/SIMULINK. Further the efficiency of robust controller may be enhanced by selecting the optimized controller parameters. The simulation results revealed that the optimized sliding mode controller helped in a great deal in getting better stability of the VSC-HVDC system with respect to parameter variations and exterior load turbulence compared to conventional PI and fuzzy controller under various fault conditions.
VSC-HVDC, PI controller, fuzzy controller, sliding mode controller spider monkey optimization
