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Behavior of Capstone and Honeywell Microturbine Generators During Load Changes were calculated as the product of currents and voltages. Each raw data file contained a series of high-speed samples of voltage and current taken every second during each test. These high- speed samples were reduced to an RMS number through use of Excel spreadsheets. The resulting RMS numbers were graphed for each test for which there were good data. This method of data collection proved to be both difficult and unreliable. The second set of tests, conducted in October 2000, used Capstone software to connect directly to the MTG and collect all available internal data. This approach greatly simplified the data reduction phase of the testing. Data were communicated directly to the laptop and recorded in comma-delimited files. The fastest data-collection rate for this software package is two-second intervals. The only problem encountered was the software’s tendency to occasionally record two entries with the same time stamp or to pause for a three-second interval rather than the two second interval that was intended. These problems are most likely caused by a slight difference in the microturbine and laptop clocks. 3.2.2 Honeywell Data from the December 2000 tests of the Honeywell MTG were collected directly from the microturbine using Honeywell’s ITGCMD software and an RS-232 connection. The fastest data sample rate that could be recorded with this software was one-second intervals. This rate was used in all the grid-connect tests. During the test setup, the option to record all internal data points was selected. The resulting file had too many columns to import properly into Excel, so each file had to be split into two parts and then imported. After columns were deleted that contained unused fields or data irrelevant to these tests, the two data sets were recombined in a single Excel spreadsheet, which was used for the final analyses. During later tests, care was taken to not include too many columns of data. Like the Capstone software, the Honeywell software occasionally recorded two entries with the same time stamp. 3.3 Test Procedure Tests were conducted with several different steps up and down in MTG output. The step change in MTG output was initiated by selecting the proper power level from the control panel on the front of the MTG. After each step change was entered on the front panel of the MTG, time was allowed for the power levels and temperatures to stabilize before the next step change was initialized. For the Capstone MTG, step tests were done for 18 percent, 36 percent, 54 percent, and 100 percent steps. For the Honeywell MTG, step tests were done for 20 percent 47-53 percent, and 100 percent steps. See the Analysis section below for more details. In addition to the step tests, a complete start-up and shutdown sequence was recorded for each MTG. 3.4 Analysis 3.4.1 Capstone Two sets of tests were done for the Capstone MTG. The first set of tests was conducted on a high-pressure gas unit that could only operate in grid-connect mode. The second set of tests was 8PDF Image | Behavior of Capstone and Honeywell Microturbine Generators During Load Changes Consultant Report
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