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Behavior of Capstone and Honeywell Microturbine Generators During Load Changes Both MTGs can ramp voltage up to start a large load if necessary. The manufacturers recommend the use of soft-start devices for large motors to avoid large inrush currents during starting. 4.4.1 Capstone Analysis of the graphs of the Capstone Model 330 microturbine (Appendix D) shows that this device can respond to load changes as rapidly as the monitoring equipment could measure (one- second data sampling intervals). In the stand-alone mode, the turbine relies on its internal battery to handle quick increases or decreases in demand. The turbine then ramps to the new power level during the next few seconds. Tables 13 and 14 show the times required for the turbine to ramp to the new power output level during different step changes in load at the load banks. There were only minor changes in the turbine speed during reactive power load changes. Table 13. Capstone Ramp-Down Time Start Load (kW) End Load (kW) Time to Change Load Transition Time (sec) (sec/kW) 24 20 5 1.3 20 16 4 1.0 16 12 6 1.5 12 8 9 2.3 8 4 14 3.5 4 2 11 5.5 24 12 5 0.4 12 0 22 1.8 24 0 26 1.1 Table 14. Capstone Ramp-Up Time Start Load (kW) End Load (kW) Time to Change Load Transition Time (sec) (sec/kW) 2 8 11 1.8 8 16 4 0.5 16 24 4 0.5 0 24 10 0.4 0 24 13 0.5 During a step down in MTG real power output, several characteristics were noted. First, when the load bank power was reduced, turbine shaft speed dropped smoothly to its new operating point. The turbine exit temperature spiked for a few seconds, but it then returned to normal for the new operating point. The DC bus voltage rose to 785-800 VDC but then returned to the normal operating point of 745 VDC. The only exception to this pattern was when the turbine output power was very low or zero. In those cases, the DC voltage stayed near 785 VDC. 19PDF Image | Behavior of Capstone and Honeywell Microturbine Generators During Load Changes Consultant Report
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