Frequency Control of Power System with Wind Farms by Using Output Frequency Band Control of HVDC Interconnection Line

In recent years, environmental problems are becoming serious and renewable energy has attracted attention as their solutions. However, the electricity generation using the renewable energy has a demerit that the output becomes unstable because of intermittent characteristics such as variations of wind speed. Frequency fluctuations due to the installation of large-scale wind farm (WF) into the power system is a major concern. In order to solve the problem, this paper proposes a new coordinated control method using High Voltage Direct Current (HVDC) interconnection line to suppress the frequency fluctuations due to large scale WF. The frequency control method using notch-band pass filter and the HVDC power control using dead band is proposed in this paper. Validity of the proposed method is verified through simulation analyses which is performed on a multi-machine power system model.