Question

Justify load flow equation can be termed as static load flow equation

Answer 1

Answer:

The complex power injected by the generating source into the ith bus of a power system is given as:

Si = Pi + j Qi = Vi Ii* i = 1, 2, …, n …(6.56)

where Vi is the voltage at the ith bus with respect to ground and Ii* is the complex conjugate of source current Ii injected into the bus.

It is convenient to handle load flow problem by using Ii rather than Ii*. So, taking the complex conjugate of Eq. (6.56), we have –

Si* = Pi – j Qi = Vi*Ii ; n = 1, 2, 3, …., n …(6.57a)

Equating real and imaginary parts, we have –

So real and reactive power can now be expressed as –