Oscillation Stability Analysis and Damping control of Grid-Connected Concentrated Solar Power-Photovoltaic Coupling System

The grid-connected concentrated solar power-photovoltaic coupling system (CSPPVCS) efficiently utilizes local solar resources but can encounter stability challenges due to its intricate control mechanisms. To address this, our study introduces an oscillation stability analysis method and a damping control strategy for CSPPVCS. By constructing a small-signal dynamic model for the entire system, we utilize eigenvalue analysis to explore potential oscillation scenarios. This approach elucidates the correlation between system variables and oscillation modes. Our findings reveal the presence of low-frequency oscillations within CSPPVCS. Through time-domain simulations, we validate the accuracy of our proposed oscillation stability analysis method. Subsequently, we devise a damping control strategy based on the analysis outcomes to mitigate low-frequency oscillations. The efficacy of this strategy is confirmed through additional time-domain simulations.