The Impact of the "Wind Farm - Battery" Unit on the Power System Stability and Control

The largest disadvantage of wind power is its weather dependence, i.e. volatility. With the fast increase of the installed wind power, especially offshore, their impact on the power system operation will increase too. In order to remedy the impact of these drawbacks of the wind power, the use of batteries as power buffer has been investigated. Smoothening of the power fluctuations from large wind farms and use of batteries as primary and secondary control of the wind farm has been analysed. The connection of one "wind farm - battery" unit on a test power system has been modelled. The system with and without the use of battery has been tested. Thereat the power system stability parameters have been observed (rotor angle, voltage and frequency). Obtained results show large improvement in power system stability when using battery as a power backup of large wind farms.