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Behavior of Capstone and Honeywell Microturbine Generators During Load Changes older unit. This is most noticeable when the MTG is operating at low power output. See the comparisons in Table 6 below. Table 6. Differences Between the 1999 and 2000 Tests 5 10 12 22 10 10 15 15 26 11 20 Full 11 12 1 Full 20 13 16 3 20 15 12 12 0 15 10 16 22 6 10 5 12 28 16 Full 0 30 50 20 During a step down in the MTG power output, several characteristics were seen. First, when the power reduction command was entered, there was a small rise in the MTG output power (1 to 2 kW) as turbine speed smoothly decreased. As the MTG reached the new power level, turbine speed stabilized at a lower level. There was also a very small momentary rise (1 to 2 volts) in the DC Bus voltage, after which the voltage returned to 760 volts DC. The turbine exit temperature decreased slightly when the MTG output was at higher levels (15 kW to full power), probably because of an increase in turbine air flow. By contrast, the turbine exit temperature began a steady rise following the step-down in power at lower levels (<10 kW). This rise was on the order of 50 degrees C. During a step up in the MTG power output, the turbine shaft speed increased quickly and peaked when power reached the new setting. As turbine speed increased, DC link voltages increased from 1 to 3 VDC; these values then settled back to 760 volts. Turbine exit temperature dropped when the step change was entered and then settled at a lower temperature than before the step. When the new operating level was established, the turbine stabilized at a higher speed, and turbine exhaust temperature settled at about 600 degrees C. The only exception to this pattern was when the turbine was operating at power levels lower than 10 kW; under these conditions, the turbine exit temperature climbed to as high as 700 degrees C. During all of the ramping tests, line voltages, current injected into each phase, and per-phase power were recorded. In all cases the currents and powers were well balanced. Phase voltages were also well balanced, typically differing by less than 2 volts. This behavior is as expected because the inverter operates as a current source while the MTG is in grid-connect mode. Several MTG shutdown sequences were captured because of the tripping of the MTG at low power level. The complete shutdown sequence from the time the turbine was tripped to turbine stop was 10 minutes and 37 seconds. The majority of this time was spent in the cool-down state. during which the turbine was driven at 45,000 RPM for almost 10 minutes. The timing and sequence of the shutdown are shown in Table 7 below. Start Load (kW) End Load (kW) Time to Change Load (sec) – Old Unit Time to Change Load (sec) – New Unit Difference (New - Old) 11PDF Image | Behavior of Capstone and Honeywell Microturbine Generators During Load Changes Consultant Report
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