Verification of wind parks and their integration into small-interconnected power system

Continuously increasing percentage of wind power that is integrated into power system is causing additional challenges to system operators, especially in the case of small-interconnected power system. Estonian power system is an excellent example of that situation due to its configuration and load characteristics. Therefore, adequate requirement for connection of wind parks are needed. In this paper, the present situation of wind power development in Estonia and probable future scenarios and their influence to power system operation and development are discussed and analyzed. Moreover, comprehensive clarification of requirements (e.g. P, Q and V regulation, fault-ride-through and power quality criterions etc.) and legislation for connection of wind parks, considering system security and operational aspects, are discussed and compared with different requirements specified by other system operators. An example of integration of wind park into Estonian power system is presented. Adequate requirements will assure permissible operation of the Estonian power system in steady-state and in different contingencies.