Method of operating a wind park

A method of operating a wind park comprising a plurality of wind turbines, which method comprises:

• determining by an active power controller:
• a grid condition indicator indicative of a condition of a grid into which the wind park feeds;
• a first maximum power value of the wind park based on the grid condition indicator wherein the first maximum power value is the maximum active power that is allowed to be transferred to the grid;
• an operating margin based on the grid condition indicator and;
• a second maximum power value based on the operating margin wherein the second maximum power value is a power limit for a wind turbine of the plurality of wind turbines;
• and
• curtailing by the active power controller an active power output of the wind park to a lowest maximum power value between the first maximum power value and the second maximum power value that is associated with stable operation of the wind park when the grid condition indicator is indicative of a weak grid.