Oscillation Stability of Grid-Connected Concentrated Solar Power Plant

Concentrated solar power (CSP) has experienced rapid development in recent years due to its inertia and energy storage characteristics. Compared to traditional thermal power units, CSP systems typically have a smaller unit capacity and lower inertia. Furthermore, CSP plants are generally located in remote desert areas, far from load centers. When active power is transmitted over long-distance lines, oscillations may be triggered due to mismatches in the unit parameters, excitation parameters, and line parameters. Therefore, this paper investigates the oscillation stability of the grid-connected CSP plant. To this end, a comprehensive system model is first established, which includes the dynamic models of the solar concentrator heating system, the thermal energy storage system, and the power generation system. Based on the small-signal model, the oscillation modes of the system are obtained through modal analysis. The oscillation modes related to the excitation system shift to the right as the excitation system parameters increase, indicating that excessively large excitation parameters could pose a risk of oscillation in the system. The results of time-domain simulation analysis also confirm this conclusion.