An Integrated Control System for Frequency and Voltage Support via Type-3 Wind Turbines equipped with Energy Storage System

Generation from Wind Turbines has a minimal impact on the environment compared to traditional energy sources. Renewables can effectively tackle the problems which arise with fossil fuel usage. The most considerable disadvantage of the Renewable Energy Sources (RES), and also Wind Turbines, is that, since they are inverter-based they cannot inherently support system's frequency. Thus, when their penetration is increased, the systems stability and reliability are endangered. Moreover, nowadays RES are mostly rewarded only for providing Active Power to the grid; thus, they did not participate in voltage regulation. This situation can risk the voltage stability of the system with high renewable penetration. The contribution of this paper, is an integrated control system which is capable of providing frequency and voltage support to the grid, while operating the Wind Turbine at its optimal point, by utilizing an Energy Storage System. The design and the simulation of this system was performed in real-time with RTDS.