Comparative Evaluation between Direct Connected and VSC-HVDC Grid Connected Wind Farm

Abstract

Nowadays, the penetration level of wind power generation plants has reached a high level. The double Fed Induction Generator (DFIG) based wind turbines are the most preferred type, due to their advantages. Following the impact of wind power plant onto power system, they are now requested by the utilities through grid codes to participate to the grid support and stabilization. For the safety of network operations, an evaluation of DFIG grid connection methods is needed to provide a performance platform in grid connection interface choice and grid codes requirement.This paper presents a comparative study of dynamic behavior of two methods of DFIG wind turbine connection to the grid: direct method and the connection through high voltage direct current transmission system (VSC-HVDC), during the fault.

Keywords: Mathematical model of DFIG, fault ride-through (FRT)/ low voltage ride-through (LVRT) requirement, impact of FRT/LVRT on wind farm, VSC-HVDC, MATLAB/Simulations