Tóm tắt: Recently Wind Generator (WG) has been experiencing a rapid development in a global scale. The size of wind turbines and wind power plants are increasing quickly; a large amount of wind power is integrated into the power system. As the wind power penetration into the grid increases quickly, the influence of wind turbines on the dynamic stability is becoming more and more important. In this contribution, the dynamic operation of two pilot Vietnam wind power plants is analyzed. These wind power plants are located in Phuoc Ninh (Ninh Thuan) and Phuong Mai (Binh Dinh), Vietnam in 2015. Results are shown for the dynamic behaviour of the wind power plants operating in isolated mode and connected to the South - east region power system. The Electromagnetic Transient simulator PSCAD/EMTDC 4.0 has been used to carry-out the reported case studies.