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- Sending end power = 3.75MW

- RL=5.18 ohms

- XL=130 ohms

- VS (Generator bus)=161kV

- VR (Infinite bus)=161kV

- Sending end voltage angle (delta) = 0.01877 (Angle which allows 3.75MW to be transferred)

Using these I want to calculate the amount of reactive power sent by the sending end as well.

I calculated it first without factoring in the line resistance (RL=0) Then got the result for Q as : **35.24kVAR**

Next I calculated it with the line resistance factored in Then got the result for Q as: **-114.77kVAR**

When the line resistance is factored in, the answers for reactive power vary immensely. And when the resistance is factored in, the sign of Q is negative indicating the generator bus is absorbing VARS which doesn't seem to make sense.

Why are they so different? What am I doing wrong?

The equations I used are here

I derived these equations using Matlab to do the algebra, so it hopefully should be correct :)