How Do You Calculate Line Flows from Load Flow Analysis?

[maverick280857]

Hi everyone

Suppose I have an n bus system with some initial conditions and a load flow analysis is carried out, which furnishes complex voltages and powers. Now, I need to find the line flows, i.e. the power flowing over every transmission line.

If I consider a transmission line from bus i to bus j and call F(i, j) the flow from bus i to bus j and F(j, i) as the flow from bus j to bus i, then

F(i, j) + F(j, i) = Loss(i, j) = power dissipated in the line

The question is: how does one figure out F(i, j) for all valid (i, j) pairs, i.e. the line flows for all transmission lines, from a load flow analysis?

Thanks in advance.
Vivek

 

[anorlunda]

The question is: how does one figure out F(i, j) for all valid (i, j) pairs, i.e. the line flows for all transmission lines, from a load flow analysis?

I don't know why you're asking this, the load flow program itself can provide you with all those calculations.

But simply consider each branch from I to J. You have the complex voltages V(I) and V(J). You have the R, L, B/2 parameters of the equivalent circuit. Just use OHM's law.