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Behavior of Capstone and Honeywell Microturbine Generators During Load Changes 5. Parallel Testing 5.1 Test Setup The third set of tests of the two microturbines was designed to record the behavior of two MTGs operating in parallel connected to load banks. For these tests, there were four Avtron load banks, two with a capacity of 55.5 kW and the other two with a capacity of 40.5-kVAR reactive load. There were approximately 60 feet of cable between each turbine and the load banks (30 feet of #6 and 30 feet of 2/0). In these tests, one MTG was operated in stand-alone mode and the second MTG was operated in grid-connect mode. This arrangement was necessary because safety protocols do not allow connection of the second MTG in stand-alone mode to the “grid” established by the first MTG. Data were collected from the internal MTG monitoring (for the stand-alone MTG) by a laptop computer running the required software. In addition, electrical data were collected at the load banks with the Amprobe data logger. The test setup is shown in Figure 3 below. 2 x 55 kW Resistive Load Banks MTG Under Test (Grid Connect Mode) MTG Under Test (Stand-alone Mode) 2 x 40 kVAR Inductive Load Banks Amprobe DM II Data logger Laptop Figure 3. Parallel Test Setup 5.2 Data Collection As in the earlier grid-connect tests, data were collected directly from the stand-alone MTG (at one-second intervals for the Honeywell and two-second data intervals for the Capstone MTG). As in previous tests, the MTG software occasionally produced two data records with the same time stamp. In addition, a second set of measurements (at one-second intervals) was taken at the load banks with the Amprobe DM-II data logger and recorder (using clamp-on current transformers and direct input of the 480-volt signal). The second MTG that was operating in grid-connect mode was not monitored by laptop, but its power output values were known because they were input from the MTG front panel. 25PDF Image | Behavior of Capstone and Honeywell Microturbine Generators During Load Changes Consultant Report
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