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Rate Mode 1 Variable Pricing 2 Fixed-Rate Pricing Figures C.3 and C.4 show flow diagrams corresponding to the strategies for each pricing structure. The variable price control strategy is designed to maximize output during the peak-rate period. The fixed-rate price control strategy is designed to maintain a constant output over a longer period, maximizing overall powerplant efficiency. Both control strategies are driven first by the input from the solar field. In the absence of positive flow from the solar field, Type 998 does nothing. If there is positive heat transfer fluid flow from the solar field, the outlet temperature of the solar field is then evaluated. If the temperature of the flow is greater than or equal to the temperature deemed sufficient for charging (T_min_charge) then the storage system enters “charge mode.” If not, it enters “discharge mode.” Discharge mode is the same for both control strategies, the storage system is discharged at a flow rate sufficient to achieve a user- specified delivery of heat transfer fluid to the power cycle ( m& discharge ) until the storage system has been exhausted (Storage_Code = 3). “Charge mode” operation is different for each control strategy. In variable-price mode (Rate_Mode =1) there is accommodation for a “peak” period where the value of output is at a maximum. This strategy is built around focusing plant output over a relatively short time-band where plant output is much more valuable. During peak periods all resources (solar field flow and storage) are simultaneously focused on power generation at a user-defined maximum solar field fluid flow rate ( m& peak ). During off-peak periods all available solar field flow is used to charge storage so that it is available during the peak period. In fixed-rate mode (Rate_Mode =2) there is accommodation for constant-output operation. Constant output is achieved by setting a design delivery rate of heat transfer fluid to the power cycle ( m& discharge ). All solar field flow in excess of m& discharge is diverted to storage. Likewise, if solar field flow is less than m& discharge then storage is used to boost solar field flow to the design level. 179PDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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