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Behavior of Capstone and Honeywell Microturbine Generators During Load Changes Table 11. Start-up Sequence for Honeywell MTG MTG State Time of Transition to Next State Events 0 1 2 3 4 5 Full Power 14:21:15 14:22:33 14:22:44 14:22:54 14:24:04 14:27:36 MTG off Self test, purge, and charge DC link Spin turbine to about 35,000 RPM Turn on fuel, ignite combustor, and spin turbine to 50,000 RPM Warm up MTG Put MTG on line and ramp up to 75 kW MTG reaches full power 3.5 Observations/Conclusions Both microturbines were able to operate in grid-connect mode and follow the load changes input on the front panels as long as load settings were maintained within the specifications for the MTG. These microturbines, while operating in grid-connect mode, are not able to track fast load changes that would be required for micro grid operations. Some modification of the controls as well as energy storage would be necessary to allow quick power changes. In addition, the mode of operation for the inverter does not allow regulation of voltage or frequency a function that is important in a microgrid. 3.5.1 Capstone Based on the tests conducted for the Capstone MTG, we highlight the following observations and conclusions: • The transition times during power increase and decrease were similar but much faster when the MTG power output was above 10 kW. • At higher load settings, step changes were accomplished at a rate of 1.2 to 3.6 seconds per kW. At the lower load settings, the step changes moved at 4.4 to 7.6 seconds per kW during the second set of tests of this microturbine. This slower response at low loads is a result of unstable operation of the MTG at power levels below 10 kW. This behavior was not observed in the original turbine tested in 1999. • Most of the transition times measured in the October 2000 tests are somewhat slower than those measured for the unit tested in 1999. 3.5.2 Honeywell Based on the tests conducted on the Honeywell MTG , we highlight the following observations and conclusions: • The transition times during power decrease were about 0.9 to 1 second per kW with the transition times during power increase being slightly slower (about 1.1 to 1.2 seconds per kW). 15PDF Image | Behavior of Capstone and Honeywell Microturbine Generators During Load Changes Consultant Report
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