Energy storage design and optimization for power system with wind feeding

The electrical energy production from renewable sources has gained considerably in importance in the last years. A meaningful possibility of energy generation from renewable sources is the use of wind energy. The wind energy generation is weather dependent and load independent. Therefore, it can have a certain unreliability, which can cause the power fluctuations into the system. A possible solution for this problem can be the storage of wind energy. The use of sodium-sulphur (NaS) batteries is a meaningful backup method for large wind farms because of their excellent technical characteristics such as high energy density, high power density, high efficiency and long life times. For this paper a model, which calculates the optimal battery size for compensation of short-term forecast errors, are developed and the application of the battery systems is optimized.