Typical step response of a micro-turbine

Transient changes in load power demand may result from faults in transmission line or load switching. For instance, a 75-kW Honeywell micro-turbine took about 35 s to respond for a 50%change in power demand under the grid-connected mode of operation.On the other hand, some fuel cells require about 10 s for a 15% change in power output.Furthermore, a fuel cell also has a recovery period of a few minutes to establish equilibrium before it can meet another step change in power output. The typical response that can be expected of a micro-turbine for a step change in load demand is illustrated in Figure. In the figure, PL denotes the load power demand, PS is the response of the micro-turbine, and (PL-PS) is the short age in power that needs to be supplied through some means. Inthe grid-connected mode of operation, the grid supplies the shortage in power until the micro-source responds to a step changein power demand. However, in the island mode of operation, this sudden demand can be met only if
additional storage is included in the MSDG system.

Source:
G. Venkataramanan, M.S. Illindala, C. Houle, and R.H. Lasseter. “Hardware Development of a  Laboratory-Scale Microgrid Phase 1—Single Inverter in Island Mode Operation”. NREL. November 2002 • NREL/SR-560-32527




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