Control by variable rotor speed of a fixed-pitch wind turbine operating in a wide speed range

Artikel i vetenskaplig tidskrift, 1993

Variable rotor speed control of a fixed-pitch wind turbine is investigated on a system consisting of a wind turbine which can operate in a wide speed range, from 0 to 38 Rpm, and produce any desired output from the rated (20 kW) to no-load, providing there is wind enough. A special technique is used to determine the operating point from the measured rotor speed and power. This is important for the control of the system. The main problem with this type of wind turbine control is to determine the upper speed limit.