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# Statement of Power Flow Problem

Quantities associated with each bus in a system, Work involved (or) to be performed by a load flow study

STATEMENT OF POWER FLOW PROBLEM

## Quantities associated with each bus in a system

Each bus in a power system is associated with four quantities and they are real power (P), reactive power (Q), magnitude of voltage (V), and phase angle of voltage (δ).

## Work involved (or) to be performed by a load flow study

(i). Representation of the system by a single line diagram

(ii). Determining the impedance diagram using the information in single line diagram (iii). Formulation of network equation

(iv). Solution of network equations

## Iterative methods to solve load flow problems

The load flow equations are non linear algebraic equations and so explicit solution as not possible. The solution of non linear equations can be obtained only by iterative numerical techniques.

## Mainly used for solution of load flow study

The Gauss seidal method, Newton Raphson method and Fast decouple methods.

## Flat voltage start

In iterative method of load flow solution, the initial voltages of all buses except slack bus assumed as 1+j0 p.u. This is referred to as flat voltage start

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Power System Analysis : Power Flow Analysis : Statement of Power Flow Problem |