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Behavior of Capstone and Honeywell Microturbine Generators During Load Changes During a step up in the MTG power output, a slightly different set of circumstances prevailed. When the output increase command was entered, the turbine shaft speed and DC link voltage both increased quickly and peaked when power reached the new setting. DC link voltages increased 30 to 50 VDC as turbine speed increased 3,000 to 13,000 RPM. When the new operating level was established, the turbine speed and DC link voltage levels decreased to steady-state levels for that power output. The only exception to this pattern was when the turbine speed reached its maximum point as discussed above. During all of the ramping tests, the current injected into each phase was recorded as equal in magnitude. This is as expected because the inverter operates in current source mode while the MTG is in grid-connect mode. The voltages in all three phases were also recorded as exactly equal. Those measurements are questionable. A note in the software documentation indicates that the current and voltage values are estimates, so there is insufficient information to verify these values. An MTG shutdown sequence was captured with data taken at one-second intervals. The complete shutdown sequence from the time the key was turned off to turbine stop was about eight minutes. The data recorded did not include the first few seconds of the shutdown sequence because the record function was not activated in time. The timing and sequence of the shutdown are shown in Table 10 below. Table 10. Shutdown Sequence for Honeywell MTG MTG State Time of Transition to Next State Events xxxxx 8 14:09:19 8 14:11:13 9 14:15:20 9 14:16:20 0 Shutdown initiated Power is ramped down from 75 kW to about 1 kW Turbine and recuperator are cooled while grid connected Fuel is shut off; cool down sequence; and turbine slows to a stop MTG controls shutdown MTG off An MTG start up was captured with data taken at one-second intervals. The complete start sequence from key turn to full power output was six minutes and 21 seconds. Because the MTG had only been shut down a short time (about five minutes), the warm-up period might have been shorter than it would have been if the unit had been completely cold at the start. The timing and sequence of the start are shown in Table 11 below. 14PDF Image | Behavior of Capstone and Honeywell Microturbine Generators During Load Changes Consultant Report
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