Method for operation of a system for airborne wind energy production and respective system

A method for operation of a system for airborne wind energy production that includes a ground station, an airborne glider with an airfoil, and a tether connecting said glider with said ground station, wherein said ground station includes a rotatable reel for storing excess length of said tether and an electrical rotary machine in effective connection to said reel, the method comprising:

• operating said system in a regular operation mode with repeated operation cycles, wherein each of said repeated operation cycles includes:
• (a) a production phase with increasing free length of the tether including flying said glider away from said ground station and producing energy by driving said electrical rotary machine via the tether using lift generated by said airfoil of said glider exposed to wind, and
• (b) a reel-in phase with decreasing free length of the tether including flying said glider towards said ground station,
• monitoring wind conditions;
• and
• changing operation of said system to a low wind operation mode when the monitored wind conditions drop below a predetermined lower wind condition threshold or changing operation of said system to a high wind operation mode when the monitored wind conditions raise above a predetermined upper wind condition threshold.