Prescribing the electric power at wind power systems, based on variable weather conditions

Abstract

The present paper determines the electric power for a wind power system, according to the time varying wind speed, v. The wind power system (WPS) consists of a wind turbine, WT and a synchronous generator with permanent magnets, SGPM. The electrical power becomes a prescribed value, P*, of the control system, ensuring stable operation and maximum captured wind power. Operation at the maximum power point (MPP) at the optimal mechanical angular speed (MAS), ω OPTIM , in the conditions in those the wind speed decreases over time causes transition to an unstable area, MAS decreasing over time. For this reason, in present, at stable operation of the wind power system, the MAS values are higher than ω OPTIM . The prescribed power values, P*, are calculated in such a way that the WPS should operate stable and the captured wind power is as high as possible. To determine the prescribed power value, an algorithm is proposed that considers rapid wind speed variations. Measuring the basic functional sizes, MAS and the electric debt energy by the SGPM, we determine the dependence of optimal MAS to the wind speed and bring the WPS in the optimal operation area by modifying the generators load.