Wspólnotowy Serwis Informacyjny Badan i Rozwoju - CORDIS


In many parts of the world and certainly in Europe large areas exist where the wind resources are good or very good and the grid is relatively weak due to a small population. In these areas the capacity of the grid can very often be a limiting factor for the exploitation of the wind resource.

There are two main problems concerned with wind power and weak grids. The first is the steady state voltage level. When the power consumption is low e.g. during the night the voltage of the grid can increase to levels above the limits if the wind power input is high. The other main problem is voltage fluctuations. Because the wind is fluctuating the output from the wind turbines is also fluctuating. This together with wind turbine cut-ins can result in voltage fluctuations that are above the flicker limit. Some or all the these problems can be avoided if a so-called power control concept is applied together with the wind farm.

The idea behind the power control concept is eliminate the violations of the steady state voltage level by buffering the power from the wind turbines in periods where the voltage limits might be violated and then release it when the voltage level is lower and combine this ability with smoothing of the power output in order to remove power fluctuations that otherwise would create voltage fluctuations above the flicker limit.

The project consists of three parts: investigation of the general applicability of the power control concept, design, implementation and testing of a battery based prototype and two case studies.

In order to assess the general applicability of the concept a framework has been formulated in which the different options (power control concepts, grid reinforcement and dumping of surplus wind energy) can be compared. As part of this, models have been developed, that can assess the voltage fluctuations and the steady state voltage behaviour for the different options. The investigations have shown that the power control conce

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