Lecture Series on Power System Generation, Transmission and Distribution by Prof.D.P.Kothari, Centre for Energy Studies, IIT Delhi For more details visit nptel.iitm.ac.in
Im so thank, for these usefull lessons Sir! Im loving with how amzing are the study of power system analysis. Sorry for the mistakes, im not a native speaker, portuguese is my official language.
thanks for all Sir,i have problem witn my network, my network got 148 bus but whem i tried and simulate it all network has changé the color ( it's became yellow) in fact ,i don't what's happen
The current phase angle (+/-) corresponds to opposite power angle (+/-) . Looking at an example of a voltage source with one ideal inductor (size does not matter) you will see the that the current angle becomes -90 degrees (current lags voltage) a lagging power angle corresponds to positive reactive power. The opposite is true for capacitors. So you can see the current angle is always exactly opposite the power angle (assuming voltage angle is 0). So to properly calculate complex power (S=VI*) you would need to use the conjugate of the current to calculate the complex power in the correct quadrant. Hope this helps.
Would you mind if I correct you by telling that what he actually wrote is "Y12=Y21=-y12" ? So clever at finding mistakes huhh ,well I guess you lost your concentration in that part ,better watch the lecture again (:
