This study presents wind turbine converter stability analysis of wind farms in frequency domain. The interaction
between the wind turbine control system and the wind farm structure in wind farms is deeply investigated. Two wind farms
(i.e. Horns Rev II and Karnice) are taken into consideration in this study. It is shown that wind farm components, such as
long high-voltage alternating current cables and park transformers, can introduce significant low-frequency series resonances
seen from the wind turbine terminals that can affect wind turbine control system operation and overall wind farm stability