دانلود رایگان مقاله انگلیسی مدل سازی و شبیه سازی دینامیکی سیستم تولید بخار برای نیروگاه خورشیدی - الزویر 2019

Abstract

In a parabolic trough solar power plant, the steam generation system is the junction of the heat transfer fluid circuit and the water/steam circuit. Due to the discontinuous nature of solar radiation, the dynamic characteristics of working fluid physical parameters, such as mass flow rate, temperature, and pressure, are more evident in the steam generation system in this kind of plant, increasing the complexity of system operation. In this paper, a zero-dimension dynamic model of an oil/water steam generation system was developed based on the lumped parameter method. Based on the developed model, four typical single-parameter disturbance processes were simulated, and then the control strategy was obtained. System-level simulations on different days (clear and cloudy) and in different seasons (spring, summer, autumn, and winter) were also conducted on a STAR-90 simulation platform using real meteorological data. The simulation results show that PI control can be used to adjust the water level, that system operation on cloudy days should be avoided, and that the system can continue to generate steam after the sun sets. The simulation results can provide a useful reference for plant operators.

Conclusions and future work

In this paper, the oil/water steam generation system of the Yanqing 1-MWe parabolic trough solar power pilot plant was modeled and the modeling method was presented in detail. In the steady-state validation, the simulation values show good agreement with the design values, and the maximum error is not above 1%. Based on the developed model, four typical single-parameter disturbance and system-level dynamic simulations were carried out. The simulation results provide insights that can be used as guidance for system operation. These insights are summarized as follows. i. The steam mass flow rate disturbance and the thermal oil inlet temperature step disturbance have more obvious impact on the system parameters. Therefore, the steam mass flow rate and thermal oil inlet temperature should remain unchanged to ensure that the system operates as steadily as possible. ii. PI control by regulating the feed water mass flow rate can be used to adjust the water level.