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I am looking for equation to stability limit curve alongside inverted v curves of a synchronous generator.

Here is an example of this curve from page 483 of the book: "Electric Machines" by D.P. Kothari and I.J. Nagrath, Fourth Edition, McGraw Hill Education (India) Private Limited.

Inverted v curves and stability limit

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  • \$\begingroup\$ If you had data to show phase of current rather than pF it would be close to |90 deg| with the excitation current of If depending on the leakage inductance. \$\endgroup\$ Commented Feb 8 at 18:33
  • \$\begingroup\$ No in fact i am looking for ploting same graph in picture above. \$\endgroup\$ Commented Feb 9 at 15:02
  • \$\begingroup\$ Try again. You cannot plot pf unless you have the current phase to compute pf=reactive/real power ratio and close to 90 deg phase current will be the boundary curve with motor losses at 0 Pu load. What is beyond Pu load of 0 and 1 ?? \$\endgroup\$ Commented Feb 9 at 19:08
  • \$\begingroup\$ Well when i plot the stability curve according to my equations i get a curve that starts from 0 and goes increasing. But the curve in the book is in fact decreasing and not starting from zero. \$\endgroup\$ Commented Feb 9 at 20:18
  • \$\begingroup\$ Can you imagine which parameter allows you to be stable with slightly more than zero field current? at no load. That may expose an error. \$\endgroup\$ Commented Feb 9 at 20:32

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