A wind farm with a simple electrical topology based on passive rectifiers and a single inverter (mutual topology) is compared to a more complex topology where each turbine has a separate inverter (separate topology). In both cases, the turbines are controlled electrically by varying the...

The power coefficient of a turbine increases according to the predictions from streamtube theory for sites with a confined fluid flow. Here, a vertical axis turbine (optimized for free flow) has been simulated by a two-dimensional vortex method, both in a channel and in free flow. The first part...

A control system for a vertical axis wind turbine is presented. The electric load is determined solely from the rotational velocity and the characteristics of the turbine, thus measurements of the incoming wind speed are not required. The control system is evaluated with an aerodynamic vortex...