Test: Load-Flow Study of Power Systems - Electrical Engineering (EE) MCQ

Assumption of decoupling is valid in load flow study only if resistance of the line is negligible in comparison to the reactance of the line.

Since active power flows from leading bus to lagging bus therefore, P will flow from i to k.
Since, reactive power flows from high potential bus to low potential bus therefore, Q will flow from i to k.

Out of the 15% of Generator buses in a power system, one bus is taken as a slack bus which take care of losses occuring in the system. At a generator bus P and V are known. Hence, a slack bus can be a PV bus.

A synchronous condeser regulates Q and thus controls power factor of the system.

Given, S = ( P - j Q )... for given network
Since P is positive, therefore the given network absorbs P.
Since Q is negative, therefore the given network absorbs -Q or delviers +Q.

Hence, number of variables to be solved by NR method in polar coordinates = 183.