Investigations on energy yield and power fluctuation from different control methods for wind energy converters at various wind conditions

The amount of electricity generated by wind power converters is world wide steadily growing. In many countries it has become a political and public interest to support this development. From the wind park owner side of view it is of essential interest to generate and sell as much electricity as possible. With increasing shares of wind energy in the electrical power supply, their influence on the mains stability and their reliable energy contribution will become more relevant. Especially at points of common coupling of weak grid branches fluctuating power output of wind energy converters can be harmful for the grid stability. The system management of wind energy converters has great influence on the power yield and the damping/amplification of wind caused power fluctuations. This paper compares a new control approach, the stochastic dynamic optimization, with common control methods, regarding their power yield and electrical power output fluctuation for different wind conditions. The results show that the stochastic dynamic optimization control approach has superior performance regarding the power yield and low power output fluctuation.