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operation of the powerplant into the evening. Figure 7.7 and Figure 7.8 show the basic structure of both control strategies. They are both dispatched based on the input from the solar field. If there is positive heat transfer fluid flow from the solar field and it meets some defined temperature specification for storing thermal energy (e.g. T=400oC) the system enters “charge mode.” If this temperature requirement is not met, the system is controlled to enter “discharge mode.” Discharge mode is the same for both control strategies, wherein the tank is discharged at some specified rate (by supplying thermal energy to the powerplant) until its charge has been exhausted. It is during “charge mode” that system operation is different for the two control strategies. In variable-price mode there is a defined “peak” window of time where the price for electricity is high. This strategy is built around focusing plant output during the peak period. During peak periods all resources (solar field flow and storage) are simultaneously focused on power generation by maximizing the fluid delivery rate to the power cycle. During off-peak periods the plant shuts down and all available solar field flow is used to charge storage in anticipation of the peak period. Referring to Figure 7.6, this strategy generally requires storage of thermal energy during the morning hours and then operating the power cycle at peak capacity during the afternoon using a combination of storage discharge and fluid delivered by the solar field. In fixed-rate mode, storage discharge control is designed to maintain power cycle operation at its maximum efficiency point (constant output). Constant output is achieved by delivering a fixed rate of heat transfer fluid to the power cycle by selectively charging and discharging storage depending on the rate at which heat transfer fluid is provided from the solar field. Heat transfer fluid delivered from the solar field in excess of the requirement of the power cycle is stored. Storage is discharged when heat transfer fluid delivered from the solar field is insufficient to meet the power cycle’s demands. Further details of control strategy implementation are presented in Appendices B and C. 145PDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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