Abstract: A computer-implemented method for modeling and/or improving operational performance of an energy system includes providing a graphical user interface configured to allow a user to manipulate equipment icons into an energy system model representation, using modular, piece-wise linear equipment models to simulate non-linear behavior of equipment represented by the manipulated equipment icons to solve an energy system model represented by the manipulation, and displaying a solution of the energy system model.

Abstract: Methods and systems for operating combined cycle electrical generating plants is provided. The method includes simulating the electrical power plant performance, simulating the steam utilizing process plant performance, parameterizing plant equipment and plant performance using the power plant and process plant simulation results, and solving parameterized simultaneous equations and constraints with an objective function to determine parameter settings that facilitate enhancing an efficiency of the combined cycle electrical generating/steam-utilizing process plant.