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144 7.2 Storage System Control and Operating Strategies The presence of a thermal storage system in a solar powerplant requires operating and control strategies to dictate when and how the storage is used. Two storage system control and dispatch strategies are presented in this section. These strategies are derived with a specific focus on two utility pricing schemes. The pricing schemes are: variable and fixed-rate pricing. Note that these strategies are configured for daily charge- discharge cycles, no accommodation is made for potentially longer storage terms. In the case of variable pricing the price the utility is willing to pay for electricity delivered to the grid varies through the day. In this case, it is desirable to maximize plant output during the period when electricity has the most value. Storage can be a strategic asset in this situation as the plant’s production peak is often separated by several hours from the price peak. Figure 7.6 shows sample average real-time pricing data for a summer day in California [Reindl, 2006] compared to average summer insolation from Dagget California [Patnode, 2006]. Figure 7.6: Typical time-shift between utility peak rate periods and peak solar insolation in California. The operating strategy derived based on a fixed-price paid for electricity is different than the variable price case. In the fixed-price case it is desirable to maximize the total electricity output of the system. This can be accomplished by using storage to maintain powerplant operation at its maximum efficiency point. Storage would be used to both maintain the design input to the powerplant during low-insolation periods, and extend thePDF Image | Organic Rankine Cycle Solar-Thermal Powerplants
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