Application Of Sliding Mode Predictive Control In Solar Thermal Power Generation Collector Subsystem

Abstract

Aiming at the randomness and strong disturbance of linear Fresnel solar thermal power generation system, a sliding mode predictive control strategy is proposed. First, the dynamic mathematical model of the collector circuit is established by considering solar radiation, molten salt inlet temperature, and ambient temperature. Second, a sliding mode predictive controller for the molten salt outlet temperature of the collector field is developed, the sliding mode prediction control (SMPC) is used because it has the advantages of strong robustness and insensitive disturbances, and solves the problem of the randomness and disturbance of the collector system. At last, we use the data that Dunhuang Dacheng linear Fresnel molten salt photothermal power station has been grid connected operation to simulation test. The results reveal that, when compared to MPC and SMC, SMPC has a faster tracking speed and response time, and lower tracking error for the collector system, as well as improved the collector system’s robustness and anti-interference. Due to the strong wind in Northwest China, it has a significant impact on the collector field. In the future, wind speed should be considered as a disturbance to control the outlet temperature of molten salt in the heat collection field more accurately.

Keywords

• collector system
• linear fresnel
• sliding mode predictive control
• solar thermal power generation