A Review on LVRT and HVRT requirements and enhancement methods for DFIG wind turbines in INDIA

As increased penetration level from renewable energy sources in to electric grid, it's become a challenging task for grid engineers to maintain stability and reliability in the network during the abnormal conditions. This situation has resulted the developing of the new grid codes for the LVRT and HVRT capability to maintain the stability in the grid during severe disturbances. This paper provides LVRT and HVRT requirements for DFIG wind generation plants as per new grid codes in India and a comprehensive review on various methods available to intensify FRT proficiency of wind turbines. The available methods to improve LVRT capability are categorized into three types based on purpose of their installation; 1) To restraint the fault current 2) To support the DFIG to administer reactive power to grid 3) Both to administer reactive power from wind generator to grid and to restraint fault current. All available HVRT enhancement methods also clearly discussed in this paper. The different methods under each category are explained in the aspects of efficiency, drawbacks and extra cost to be incurred, thereby providing complete knowledge about a particular method.