Efficient data-driven models for prediction and optimization of geothermal power plant operations

• Published in: Geothermics 2024-02, Vol.119
• Main Authors: Ling, Wei, Liu, Yingxiang, Young, Robert, Cladouhos, Trenton T., Jafarpour, Behnam
• Format: Article
• Language: English
• Subjects: GEOTHERMAL ENERGY; geothermal power plants; machine learning; neural networks; optimization; organic Rankine cycle
• ISSN: 0375-6505; 1879-3576

Increasing the capacity of geothermal energy as a renewable resource calls for development and deployment of efficient control and optimization technologies for geothermal power plants. A data-driven prediction and optimization model is presented as a cost-effective and efficient alternative to physics-based approach. The model predicts power output and operational cost by propagating the influence of control and disturbance variables within an artificial neural network (ANN). Numerical experiments with simulated and field data from a real geothermal power plant are first used to demonstrate the prediction performance of the ANN model. The model is then adopted to maximize the net predicted power production by automatically adjusting the working fluid circulation rate. The optimization performance of the model in evaluated using a thermodynamic flowsheet simulation model. The workflow is applied to model and control the effect of ambient temperature on an air-cooled binary cycle power plant, which is complex and costly to perform using a physics-based predictive model. As a result, the performance of the method is demonstrated by applying it to both simulated and field datasets from a binary cycle geothermal power plant.