SS resonance analysis of complex power system incorporating wind power

This study aims to conduct the sub-synchronous (SS) resonance analysis of a multi-machine power system incorporating doubly fed induction generator (DFIG)- or permanent magnetic synchronous generator (PMSG)-based wind farm. The linearised equations involving the dynamics of steam turbine generator, wind farm, shunt capacitor, transmission line, and load are derived, and the detailed state matrix formation process pertinent to each component is presented. Taking the IEEE 16-machine-68-bus test system as example, the eigenvalue analysis along with participation factor is applied to investigate the impacts of the series compensation level of transmission line on the modal frequencies and damping ratios of two groups of oscillatory modes of interest: namely, the SS mode of the series-compensated transmission line and the shaft modes of the studied steam turbine generator before and after one of the un-studied steam turbine generators is replaced by the DFIG- or PMSG-based wind farm. Some useful conclusions and comments are drawn.