Energy system modeling apparatus and methods

1. A computer-implemented method for modeling and/or improving operational performance of a power plant, said method comprising:

providing a graphical user interface configured to allow a user to manipulate equipment icons into an energy system model representation;

using modular, function-based equipment models to simulate behavior of a plurality of physical components represented by the manipulated equipment icons, wherein the equipment models are piece-wise linear functions that simulate non-linear behavior of the plurality of physical components;

generating at least one script that defines a mathematical relationship between the plurality of physical components as a function of at least one rule governing behavior of the plurality of physical components;

using the at least one script to generate an optimized solution to the energy system model using the equipment models, wherein said generating an optimized solution comprises performing a mixed integer linear programming optimization on the equipment models to determine a first set of said plurality of physical components to operate and a second set of said plurality of physical components to not operate, wherein the first and second sets represent an optimized mode of operation of the power plant; and

displaying the solution of the energy system model.

2. A method in accordance with claim 1 wherein the piece-wise linear equipment models each represent an item of energy system equipment, a section thereof, or a pipeline element, and wherein the graphical user interface further includes icons representing economic modules, and said simulation further includes using the economic modules to solve the energy system model.

3. A method in accordance with claim 2 wherein each piece-wise linear equipment model includes at least one member of the group consisting of equations and constraints.

4. A method in accordance with claim 1 wherein the power plant is a combined-cycle power plant, a cogeneration power plant or a district heating model power plant.

5. A method in accordance with claim 1 wherein the energy system model is a model of a gas pipeline or liquid pipeline system.

6. A method in accordance with claim 1 wherein the energy system model is a model of a chemical process plant.

7. A method in accordance with claim 1 wherein the energy system model is a model of a power plant or a process plant.

8. A method in accordance with claim 1 further comprising:

receiving a signal from at least one sensor coupled to at least one physical component for receiving data from the at least one physical component, wherein the signal contains information about at least one condition of the at least one physical component; and

using the information received from the at least one sensor to generate the solution to optimize the power plant.

9. A computer system having at least a display, a pointing device, one or more processors, and memory, said memory having stored therein a set of instructions configured to instruct the processor or processors to:

display a graphical user interface of icons;

accept input from a pointing device to manipulate equipment icons into an energy system model representation;

use modular, function-based equipment models to simulate behavior of a plurality of physical components represented by the manipulated equipment icons to solve the energy system model representation, wherein the equipment models are piece-wise linear functions that simulate non-linear behavior of the plurality of physical components;

generate at least one script that defines a mathematical relationship between the plurality of physical components as a function of at least one rule governing behavior of the plurality of physical components;

generate an optimized solution to the energy system model using the at least one script and the equipment models, wherein said generating an optimized solution comprises performing a mixed integer linear programming optimization on the equipment models to determine a first set of said plurality of physical components to operate and a second set of said plurality of physical components to not operate, wherein the first and second sets represent an optimized mode of operation of the power plant; and

display the solution of the energy system model.

10. A system in accordance with claim 9 wherein the piece-wise linear equipment models each represent an item of energy system equipment, a section thereof, or an element of a pipeline.

11. A system in accordance with claim 10 wherein each of the piece-wise linear equipment models include at least one member of the group consisting of equations and constraints.

12. A system in accordance with claim 9 wherein the graphical user interface further includes icons representing economic modules, the economic modules comprise at least one of a fuel purchase, a fuel sale, and an emission credit use, and said simulation includes using the economic modules to solve the energy system model.

13. A machine readable medium readable for use with a computer system having at least a display, a pointing device, one or more processors, and memory, said medium having recorded thereon a set of instructions configured to instruct the processor or processors to:

display a graphical user interface of icons;

accept input from the pointing device to manipulate equipment icons into an energy system model representation;

use modular, function-based equipment models to simulate behavior of a plurality of physical components represented by the manipulated equipment icons to solve the energy system model representation, wherein the equipment models are piece-wise linear functions that simulate non-linear behavior of the plurality of physical components;

generate at least one script that defines a mathematical relationship between the plurality of physical components as a function of at least one rule governing behavior of the plurality of physical components;

generate an optimized solution to the energy system model using the at least one script and the equipment models, wherein said generating an optimized solution comprises performing a mixed integer linear programming optimization on the equipment models to determine a first set of said plurality of physical components to operate and a second set of said plurality of physical components to not operate, wherein the first and second sets represent an optimized mode of operation of the power plant; and

display the results of the energy system model.

14. A medium in accordance with claim 13 wherein the piece-wise linear equipment models each represent an item of energy system equipment, a section thereof, or an element of a pipeline.

15. A medium in accordance with claim 14 wherein each piece-wise linear equipment model includes at least one member of the group consisting of equations and constraints, the graphical user interface further includes icons representing economic modules, said simulation further includes using the economic modules to solve the energy system model, and instructions are further configured to instruct said processor or processors to utilize non-linear formulations for a part of an energy system model and mixed linear/integer formulations for other parts.