Impact on rotor angle stability with high solar-PV generation in power networks

This paper investigates the impact on rotor angle stability (both small-disturbance and transient rotor angle stability) with high penetration of solar-PV generation in power networks. Although a number of studies have conducted on rotor angle stability with solar-photovoltaic (PV) generation, these studies have changed more than one system parameter in the analysis, hence it is difficult to make an accurate judgement on rotor angle stability impact with solar-PV generation. In this study, a systematic methodology is followed to investigate the rotor angle stability with high solar-PV generation, by maintaining steady-state system parameters constant with solar-PV integration; these parameters include active and reactive power, and maximum rotor angle difference. Study results show that by integration of solar-PV generation, small-signal stability has improved except in the remote fault scenarios where generators with power system stabiliser (PSS) are replaced with solar-PV generation. Transient stability has worsened due to increased solar-PV penetration when a fault occurs at critical points. However, transient stability has improved when a fault occurs at less critical points, and hence fault proximity to solar-PV generation is a critical determinant of transient stability.