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Behavior of Capstone and Honeywell Microturbine Generators During Load Changes 5.3 Test Procedure The stand-alone MTG being tested was first started and kilowatt load was applied by the load bank. Once this MTG was stabilized, the second MTG was started in grid-connect mode. Starting power was drawn from the stand-alone MTG. Tests were conducted with various combinations of load bank settings and grid-connect MTG power settings for both increases in load and decreases in load. The step size of the load changes was varied to determine the effect on both turbines of increasing or decreasing load. All available parameters were recorded from the stand-alone MTG. All electrical parameters (both single-phase and three-phase) were recorded at the load banks with the Amprobe logger. The shutdown process involved first reducing the power of the grid-connect MTG to zero, followed by the cool-down sequence. Once this MTG was off, the stand-alone MTG was shut down. 5.4 Analysis The first step in the analysis was to match the data set taken by the Amprobe data logger with the data set collected directly from the stand-alone MTG. For the Capstone MTG, each data point in the two-second interval data file was doubled, creating a data set that could be combined with the Amprobe one-second-interval data. The Honeywell data set had been collected at one-second intervals, so it could be combined directly with the Amprobe data. Duplicate data records were removed from the Honeywell and Capstone files. Because the MTG and Amprobe clocks were not synchronized, the two data sets needed to be lined up by time. Once the stand-alone MTG and Amprobe data were combined in one spreadsheet, the data for the grid-connect MTG were calculated from the difference between the load bank readings and stand-alone MTG output. Once this cleaned-up data set was obtained, graphs of the results could be prepared. During both sets of tests (Capstone – Capstone, Honeywell – Capstone) the MTGs showed the same slow dynamic characteristics as they exhibited during the grid-connect and stand-alone testing done earlier. The focus of these tests was to see whether there were any measurable interactions between the MTGs. The primary indicators observed were the power output and the voltage stability. Any other unusual behavior was noted. 5.4.1 Capstone – Capstone Parallel Tests Analysis of the graphs of the Capstone – Capstone parallel tests (Appendix G) showed no unusual behavior. The initial start up and taking of load for the stand-alone Capstone (LP) MTG were identical to what was described for the stand-alone testing discussed earlier. The load banks were set to 24 kW; the stand-alone unit picked up the load, and turbine speed stabilized as in previous stand-alone tests. Once the first MTG was on line, the second Capstone turbine (HP) was started in grid-connect mode. Power to start the grid-connect MTG was drawn from the stand-alone turbine, and an increase in the power of the stand-alone MTG was observed. There was no noticeable voltage variation during this process. Once the grid-connect turbine was warmed up, it ramped to the10-kW set point. This ramping rate was the same as was observed for the turbine when it was tested in grid-connect mode. At the same time, the stand-alone turbine power ramped down to 14 kW from the initial 24 kW. There was an initial voltage drop of almost seven volts (277 to 270 VAC), but the voltage recovered to the previous level in 20 26PDF Image | Behavior of Capstone and Honeywell Microturbine Generators During Load Changes Consultant Report
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