MaxHydro version 1.0
MAXHYDRO is a true Optimization program because it provides an optimal solution to problems depending on the selected objective function and imposed constraints. Three objective functions and a variety of system constraints can be selected. Available functions are energy maximization, benefit maximization and minimization of the squared differences from a predetermined power profile. Together with the ability to quickly alter the system constraints and input parameters, the program is a powerful decision support tool. These features contribute to make the program uniquely suited to accommodate a wide range of conditions and offers unprecedented flexibility in the problem formulation and solving.
MAXHYDRO uses a fully integrated Windows graphical user interface and is designed to maximize user productivity while minimizing the complexity of model construction. Its user friendly menus provide an intuitive method to input data and set constraints. A range of scenarios can be assessed in a matter of minutes and the most promising subjected to more rigorous assessment to identify the optimal solution. Input parameters are readily changed or modified. Graphical pre-processor and post processing functions with on-line help menus simplify problem formulation and assessment. Boundary conditions can be reviewed to ensure reservoir constraints are feasible and provide a quick method to assess validity.
MAXHYDRO owes its power to the latest advanced programming techniques and unique mathematical model formulation. The model utilizes robust dynamic programming algorithms and techniques. It is a 32-bit program and has been specifically designed for efficient application on personal computers using the Windows environment.
MAXHYDRO is accurate, fast, reliable and easy to use. Optimization problems with up to three cascading reservoirs can be solved which makes it ideal for real-time hydropower system operation.
MAXHYDRO is a Windows compatible computer program for optimizing energy generation for a hydroelectric power scheme. An optimal generating schedule can be developed for the following 4 Optimization criteria:
· Maximization of energy production: calculates an optimal operation of the scheme over the forecast period given the, inflow forecast, available storage and desired final state of the system (final storage). This mode allows maximization of energy production using the best efficiency and unit allocation and provides an accurate resource planning.
· Maximization of benefits: calculates an optimal operation of the scheme over the forecast period given the tariff structure, inflow forecast, available storage and desired final state of the system (final storage). This mode allows maximization of benefits given the tariff structure and provides an accurate resource planning.
· Minimize differences from desired power profile given the inflow forecast, systems constraints by selecting the optimal final state.
The program can accommodate up to three reservoir and power stations operating in series or parallel connection and can be used as a tool for planning and real-time Optimization of hydropower stations or in mixed hydro/thermal systems.
MAXHYDRO can operate in long-term (annual or seasonal planning and analysis) and in short-term (daily) mode. In long-term mode the end user can select the time steps in days, weeks or months. Up to 600 time steps are supported. The short term scheduling covers a period of 24, 36, 48 and 72 time steps of say 30 minutes, one hour or two hours.
Allocation of hydropower resources depends on a number of variables and constraints, which interact in an infinite number of combinations. It is therefore, not possible to derive in advance a universal operating rule, which would allow an optimal operation in all situations.
Real-time Optimization overcomes the problem by analyzing each combination of variables as it happens (in real-time) and provides an optimum operating rule for each particular situation. The derived operating rule can be applied immediately.
MAXHYDRO goes beyond the real-time optimal unit allocation and takes account of future inflows, load and/or energy tariffs and allows optimal short term resource scheduling, maximizing revenues in the spot market environment.
MAXHYDRO uses the Dynamic Programming (DP) approach. Dynamic Programming is a particular mathematical technique used to solve Optimization problems defined by sequential decision processes, making it particularly suitable for water resource problems. DP is not restricted by any requirement of linearity, convexity or even continuity, making it especially suitable hydropower Optimization. The model allows accurate Optimization of non-linear hydropower relationships and provides significant advantages when compared to other Optimization techniques such as linear or integer programming.
MAXHYDRO solves the Optimization function for up to 3 storage reservoirs in series or parallel connection. It has no limitation with respect to number and type of power generating units. Characteristics of thermal units can be specified separately or grouped according to generation cost.
Results of the Optimization run are displayed in a form of projected scheme parameters over the forecast period (reservoir levels, inflows, power output, unit allocation, predicted versus maximum efficiency, energy value etc.). The results of the Optimization run should represent a global optimum of the system operation given the set of the imposed constraints. This means that the operational mode is the most effective for the forecast period and the set of constraints.
Operators have the option to graphically review the Optimization results, compare calculated benefits to alternative operating modes and to re-optimize the system operation for a different set of constraints before dispatching the units.
FLEXIBILITY
MAXHYDRO is powerful hydropower system Optimization tool that can be adjusted to suit any particular system configuration. Additional features, which might be required by end-users, can be incorporated into the model.
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