The droop speed is the drop in speed with load and is a characteristic of the governor or speed regulator for the prime mover. When used as a standalone generator this will determine the drop in frequency. It is typically 2-4% at full load. When used in conjunction with other generators (in parallel) then the generators sets will share the total load based on the droop characteristic. If they are identical then they will share equally. Two generators using droop control to provide max power at 60Hz. One has a 63.4 Hz reference and the other 61.8Hz reference for both to deliver full power at 60 Hz. Thus the aim of droop control is to adjust the governor speed references to firstly achieve the correct system frequency and secondly share load in accordance with the respective generators contribution in terms of its generating capacity. This allows generators of different sizes to share the total load unlike isochronous operation which does not. Voltage droop control...
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