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Behavior of Capstone and Honeywell Microturbine Generators During Load Changes conducted on a low-pressure gas unit that could operate in either grid-connect or stand-alone mode. First Tests (June 22, 1999) The results of measurements from the graphs for each test (Appendix A) are listed below. Because of normal variations in the output of the MTG and the way the power approached the final set point, it is difficult to get a completely accurate timing for each change. In Test # 1, a loud pop was heard from the MTG, which appears to cause the data to values vary with changing ambient air conditions. be erroneous. Full power The following table includes data for tests with increasing load: Table 3. Ramp-Up Tests 5 5 to 10 kW 6 10 to 15 kW 8 20 kW to Full power This table includes data from tests with decreasing load: Test # Test Description Time for Change (sec) Load Change (kW) Transition Time (sec/kW) Comments 12 +5 15 +5 2.4 3.0 2.9 9.3 2.7 1.4 1.2 2.4 3.2 2.4 11 +3.8 Full power = 23.8 kW Pop heard during this test Full power = 22.8 kW Full power = 24.8 kW Full power = 23.8 kW Full power = 24.9 kW Table 4. Ramp-Up Tests 1 Full power to 20 kW 11 Full power to 20 kW 9 Full power to 10 kW 17 Full power to 0 kW 12 20 to 15 kW 13 15 to 10 kW 14 10 to 5 kW 26 -2.8 13 -4.8 19 -13.8 30 -24.9 12 -5 16 -5 12 -5 Test # Test Description Time for Change (sec) Load Change (kW) Transition Time (sec/kW) Comments The conclusion that can be drawn from the preceding data is down, can be accomplished at a rate of 1.2 to 3.2 seconds/kW. These numbers are most consistent when the change in load is +/- 5 kW (2.4 to 3.2 seconds/kW). During changes that involve a large reduction in the power set point, there seems to be a quick reduction to near the set point followed by a slow reduction to the final value. These large changes show the fastest change rates (1.2 to 1.4 seconds/kW). Part of this pattern can be accounted for by the control on the turbine exhaust temperature. During test 17, the turbine exhaust temperature was observed to climb to 612 degrees C and then slowly fall to 580 degrees C at the end of the test. It is believed 9 that transitions in load, both up andPDF Image | Behavior of Capstone and Honeywell Microturbine Generators During Load Changes Consultant Report
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