Forced Oscillation in Power System with Renewable Generations

Forced disturbance (FD) with various bands of frequency may ignite forced oscillation (FO) in power systems. The FO is significantly intensified when the frequencies of FDs are nearly equal to inter-area modes in the range of 0.2 to 0.8 Hz. In modern power systems, penetration of renewable generations (REGs), e.g. wind and solar generators, may provoke the FO due to stochastic outputs. The stochastic outputs can be regarded as FD injection since variations of the outputs from these generators can probably be in the range of inter-area oscillation frequency. Therefore, the penetration of REGs in modern power systems can contribute to the FO. This paper analyzes the impacts of FO on power systems affected by the REGs. System configurations of the REGs owning to the FO is thoroughly investigated. Simulation result is validated in the modified 14-Machine Southeast Australian (SE-A) power system under various operating conditions.