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Behavior of Capstone and Honeywell Microturbine Generators During Load Changes observed to be about 10 seconds for 0 to 24 kW (as compared to 50 seconds when the unit was in grid-parallel mode). The ramp down rate was about 26 seconds for 24 to 0 kW (as compared to 50 seconds when the unit was in grid-parallel mode). • Neutral current as measured by the Amprobe indicated a slow oscillation (10- to 13- second periods) with an average value of two to 2.5 amps. The magnitude of the oscillation depended on load and ranged from zero to three amps peak to peak. • The DC bus voltage generally varied from 745 to 785 volts during the load change tests. The DC bus voltage remained essentially constant (at 760 VDC) when the turbine was in grid- parallel mode. • Power output of the microturbine drifted up as the VAR load increased. • Even with an eight percent load imbalance in one of the phases, there was little change in the balance of the three-phase voltages. 4.5.2 Honeywell The following conclusions and observations are based on the tests conducted: • The microturbine output responded immediately to changes in the load bank settings (faster than the one-second time resolution of the Amprobe measuring equipment). • The turbine does not seem to use its battery to track load changes. When the unit is in stand- alone mode, the turbine shaft speed is always 65,000 RPM. When the load changes, fuel flow is quickly changed. This mode of operation makes the MTG very sensitive to load changes especially when it is operating at higher power levels. • Neutral current as measured by the Amprobe data indicated a slow oscillation (with a period of about 25 seconds) with an average value of two amps. The magnitude of the oscillation depended on load and ranged from zero to 0.5 amps peak to peak. • The DC bus voltage generally varied from 528 to 630 volts during the load change tests. The DC bus voltage also varied while the unit was operating in grid-parallel mode but by a smaller amount. • There was at least a five-volt imbalance in the three-phase voltages at the load banks. Phase C voltage was always higher than the other two. Load imbalance caused by the load banks does not seem to affect the output voltage levels. • Measurements at the output terminals of the MTG (275 VAC delta line-to-line) showed balanced line-to-line voltages at all load values. Line currents were unbalanced at most loads with the greatest imbalance at the highest load. At 70 kW and 40 kVAR, the line currents were 144 amps (phase A) and 166 amps (phase C). 23PDF Image | Behavior of Capstone and Honeywell Microturbine Generators During Load Changes Consultant Report
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