🔍 Key Concepts

• Speed droop as the slope of the frequency vs. kW line in figure C • Relationship between steeper vs. flatter droop lines and how much kW a generator takes when paralleled at the same system frequency • How load sharing is determined when multiple generators are operating on a common bus with the same rated frequency

💭 Think About

• In figure C, compare the slopes of the lines for Machine A and Machine B. Which one has the steeper slope (larger drop in frequency for the same increase in kW)? • At the common operating frequency f₂, look at the horizontal distances ΔPₐ and ΔPᵦ. Which machine is taking more kW at that same frequency, and what does that say about its droop value? • Think about an isochronous (zero-droop) characteristic: would that machine tend to take more or less of any added load? Now extend that idea to a machine with less droop vs. one with more droop.

✅ Before You Answer

• Identify clearly which generator in figure C has the steeper frequency-power line (greater droop) and which has the flatter line (lower droop). • At the operating frequency f₂, verify which generator’s vertical line to the power axis corresponds to the larger kW output. • Be sure your choice matches the rule: lower droop → stiffer characteristic → takes the larger share of load; higher droop → softer characteristic → takes the smaller share of load.