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Behavior of Capstone and Honeywell Microturbine Generators During Load Changes 3. Grid-Connect Testing 3.1 Test Setup For this set of tests, each microturbine was connected to the utility grid and operated in grid- connect mode. In this mode, a power set point is entered in the front panel of the MTG and the turbine generates only the selected amount of power regardless of the load on the system. A laptop computer, running the required software, was connected to the MTG, and data were recorded during the tests. The test setup is shown in Figure 1. Utility Grid Figure 1. Grid-Connect Test Setup 3.2 Data Collection 3.2.1 Capstone For initial testing of the Capstone turbine in June 1999, a BMI 7100 took one-second snapshots of the MTG performance. Each snapshot was made up of 128 samples over one cycle. These snapshots were reduced through calculations to RMS values of voltage, current, and kVA. The results were plotted and analyzed for transition times. Also, at the beginning and end of each test, readings of turbine RPM, inverter current, inverter voltage, fuel-valve position, turbine exhaust temperature, inlet air temperature, and DC link voltage were manually recorded. Data were recorded by the BMI 7100 and streamed to a laptop during the test. This data transfer caused problems during the tests; data were lost for tests 2, 3, 4, 7, 10, 15, and 16. After testing was completed, the raw data files were processed to retrieve the RMS voltages and currents for the graphs. Because the MTG was set to run at unity power factor, kVA and power 7 MTG Under Test (Data from internal data logging) RS-232 Cable LaptopPDF Image | Behavior of Capstone and Honeywell Microturbine Generators During Load Changes Consultant Report
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