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<br />Guu332 <br /> <br />The Resident Power and Reservoir System Model (PRSYM) <br /> <br />Variable Spatial Resolution <br /> <br />PRSYM must include provisions for modeling a portion, or sub-system, of the entire <br />reservoir system. The user must be able to specify the sub-system, or groups of reservoirs, <br />of interest. It should be possible to analyze the specified sub-system independently of the <br />rest of the system or to examine the effects of changes in operating constraints and/or <br />hydrology in the sub-system while fixing the remainder of the system onto a pre-specified <br />schedule. <br /> <br />Acceptable Solution in Flexible Operating Zone <br /> <br />Once system constraints have been satisfied, there may still exist a range of feasible solutions <br />or alternative operating plans. The simulation module, therefore, must include a simplified <br />methodology for selecting an 'operationally acceptable' schedule within the available zone of <br />flexibility. For example, to simulate TV A reservoir operating strategy, the module could <br />attempt to minimize deviations from operating guides or other multipurpose targets while <br />maintaining balanced pool operations. Alternatively, to maximize the value of hydropower <br />generation within the context of multiobjective operating constraints, the model could attempt <br />to meet a series of economic hydrogeneration targets or weights which reflect forecasted <br />power system conditions. These methodologies may involve the use of linear programming, <br />but other solution approaches should be explored. The solution technique should reflect <br />proven (commerciallv available) optimization methodologies. Furthermore, an algorithm <br />snould be selecte<l which can later be extended to satisfy full-scale optimization functionality. <br /> <br />link to Power System Economics <br /> <br />The model must be able to create generation schedules which, subject to meeting higher <br />priority constraints, accommodate the tradeoff between current and future power supply <br />conditions in order to minimize long-range power costs. Variations in energy demand and <br />peak capacity over time must be accounted for in this process. This link between the <br />reservoir and power system could be achieved by supplying guidance to the model in the <br />form of hydrogeneration targets or expected future values of water-in-storage based on the <br />output of more complex power costing models, which have determined the maximum long- <br />range expected value of hydropower to the power system within hydrologic and power <br />system uncertainties. <br /> <br />Model Diagnostics and Traces <br /> <br />PRSYM should include pertinent model diagnostics to warn the user when the simulation <br />problem has been underdetermined or overspecified, when impossible situations have been <br />encountered, or when solution convergence has been unsuccessful. The model should <br />include a facility to alert the user if the simulation cannot continue without violation of <br />constraints. The system also should provide facilities to trace rule conflicts and identify <br />anomalies. <br /> <br />3-10 <br />