1. Greater Des Moines Energy Center Combined Cycle Plant Diagram of a Combined Cycle Generator Abstract Combined-cycle generating units are being incorporated into the current power systems in order to meet peak loading contingencies as efficiently as possible. Combined-cycle generating units consist of two simple-cycle combustion turbines and one heat-recovery steam generator. Combined-cycle generating units exhibit non-monotonically increasing cost curves which cannot be solved by classical economic dispatch optimization methods. The project team is modifying and redesigning a pre-existing algorithm to calculate optimal economic dispatch, including both monotonically and non- monotonically increasing generators, with a shorter solution time. Major milestones include comprehension of the pre-existing optimization algorithms, implementation of the algorithms in Microsoft Excel using Visual Basic macro programming, redesign of the optimization algorithm for faster solution speed, and delivery of the software and documentation to the client. Optimal results will allow for power to be produced at the lowest possible cost to the client while prolonging the life of each generating unit. Matthew Ellis EE mjellis@iastate.edu Noraima Fernandez EE fernandl@iastate.edu Jeremy Hamilton EE jerbud@iastate.edu Robert Walter EE rmwalter@iastate.edu Alan Oneal aroneal@midamerican.com Project Schedule Gantt Chart Financial Requirements/Personnel Effort http://seniord.ee.iastate.edu/may0607/ Introduction Resources and Schedule Resources and Schedule The project will build upon a software application that will seek to produce the most economical power generation, with as quick of solution times as possible, between monotonically and non- monotonically increasing generators. The algorithm will be able to handle more generator combinations and will be combined with a more aesthetically pleasing user interface to produce a more usable application. This program will be written in Microsoft Excel using Visual Basic macros and will meet the many outlined requirements. MidAmerican Energy can expect to benefit from this project through a reduction in fuel costs due to improved generator operation. Closing Summary Team Members Client Dr. John Lamont jwlamont@iastate.edu Faculty Advisor Webpage Project Requirements Project Requirements May 06-07 Problem Statement General Problem Statement Conventional monotonically increasing algorithms will not dispatch non-monotonically increasing units without altering the data, thus currently an optimal solution can not be found. General Problem Solution Modification of a pre-existing algorithm incorporated into Microsoft Excel macros in order to give MidAmerican Energy the lowest cost solution to meet their power demand with the shortest solution time possible. The project team will focus their concentration on improving the structure of the unit commitment page, reorganizing the way output is displayed, implementing a main menu, and finally restructuring the code to allow the user to dispatch only a range of hours. Operating Environment Use Visual Basic macro programming embedded in the form of a Microsoft Excel workbook The software will run on a windows-based system with adequate processing capabilitiesUser MidAmerican generation dispatchers MidAmerican short-term energy tradersUses Optimize the economic dispatch of monotonically increasing and non-monotonically increasing generators Benchmark cost curves for future algorithm designsAssumptions Enumeration / iteration will be used as the optimization method for the algorithm 12 monotonically increasing units and 2 sets of non-monotonically increasing units are being modeledLimitations Software shall use Microsoft Excel as the interface Input data for generating units shall use piece-wise linear incremental cost curves Results must be written into a single Excel workbook Expected End-Product Excel workbook file with Visual Basic macros User instructions documentation Easy to use interface ItemW/O LaborWith Labor Bound project plan (2) $8.88 Bound design report (2) $8.88 Bound final report (2) $8.88 Poster $20.00 $140.00 Subtotal$46.64 $166.64 Labor at $10 per hour:Total hour: Ellis, Matthew204$2,040.00 Fernandez, Noraima201$2,010.00 Hamilton, Jeremy202$2,020.00 Walter, Robert203$2,030.00 Total810$8,266.64 Proposed Approach Proposed Approach Proposed Approach Technologies Considered: Visual Basic (required by client) Microsoft Excel (required by client) Testing Considerations: Test the algorithm using Matlab Linear Programming Client testing in client’s environment Economic Dispatch of Non-Monotonically Increasing Generators Block diagram of proposed program References: Pictures from midamericanenergy.com and energyquest.ca.gov Other Resources None required Design Objectives Flexible program design Well-commented program code Comprehensive iteration scheme Functional Requirements Provide best generator dispatch Output iteration calculations Design Constraints Five-minute limit on iteration run time Expandable for future additional generating units Clear box design enabling modifications of program The software shall utilize Microsoft Excel as the interface Measurable Milestones End-product Design Dec. 08, 2005 Product prototype Jan. 23, 2006 Product testing Mar. 23, 2006 Product documentation Apr. 10, 2006 Product demonstration Apr. 26, 2006 Combine Solution Sets Output Optimal Dispatch Load User Defined Inputs Solve for Non- Monotonically Increasing Units Solve for Monotonically Increasing Units