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Frequently interrupted by dense clouds during the operational period, the thermal performance of parabolic trough solar collectors will experience considerable variations. Therefore, both theoretical and experiment studies were developed to analyze the dynamic thermal performance under the condition of dramatically varying direct normal solar irradiance ( DNI ) based on energy balance equations and a thermodynamics analysis. Particularly for a closed system, this unfavorable weather condition leads to the variation in the outlet temperature of parabolic trough solar collectors. Consequently, both of main factors which impact on the running status of the whole system are coupled to make heat transfer processes complex. In order to eliminate important errors due to fluctuations of the outlet temperature and DNI, the differential control volume methodology was used to model the solar irradiance in each volume based on the time intervals of the data acquisition system.

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Hot dry rock (HDR) power stations have the potential to serve as an energy storage system for large-scale photovoltaic (PV) plants. For flexible operation, thermal storage (TS) power stations are required to coordinate with HDR power stations. In this study, a hybrid power system is constructed by combining the HDR, TS, and PV plants. Game theory is then introduced into the optimal dispatch of the hybrid power system. Considering HDR, TS, and PV as players, non-cooperative and cooperative game dispatching models are established and verified by a case in the Gonghe basin of Qinghai. Finally, the stability of the coalitions and the rationality of allocation of the hybrid power system is verified, and the sensitivity of critical parameters is analyzed. The results demonstrate that the overall payoff of the hybrid power system is increased by 10.15%. The payoff of the HDR power station is increased by 16.5%. The TS power station has obtained 50% of the total extra profits. The PV plant reduces the impact on the grid to obtain the priority of grid connection. Based on these results, a theoretical basis can be provided for developing generation systems based on the HDR resources in the Gonghe Basin.