Posted On : 23.04.2017 03:06 pm

## Chapter: __Power System Analysis : Introduction__

**Modeling of Components For Load Flow Analysis**

The thevenins equivalent circuit of the generator i.e. The voltage source in series with the thevenins equivalent impedance. Z = R + jX

**MODELING OF COMPONENTS FOR LOAD FLOW ANALYSIS**

**Generator models Generators:**

The thevenins equivalent circuit of the generator i.e. The voltage source in series with the thevenins equivalent impedance. Z = R + jX

The Norton form equivalent circuit of the generator i.e. The current source in parallel with the admittance

**Transformer model**

**Transmission system model**

**Transmission Line**

Transmission line are modelled as

(i). Short line model

(ii). Medium line model

(iii). **Long line model**

** **

(i). Short line model : Resistance & inductance are assumed to be lumped

**Medium line model (lines between 80 to 250km)**

Resistance &inductance are assumed to be lumped &the total shunt admittance is divided in to two equal parts & placed at the receiving and sending ends.

X = Lω

Y/2 = Cω/2

A = 1+ZY/2

B=Z

C=Y(1+ZY/4)

D=1+ZY/4

**Long line model (lines above 250)**

Z’=Z sinhγL / γ L

Y’/2 = 1/Zc tan h (γL/2)

**Shunt Elements:**

The shunt capacitor is connected to bus i. If S is MVAR rating of shunt capacitor. So is base MVA admittance P.u. Y P.u. = 0+jS/S0

Shunt reactors is connected io bus i. If S is MVAR rating of shunt capacitor. So is base MVA admittance P.u. Y P.u. = 0-jS/S0

**Load representation**

**Load:**

Load is represented by a constant power representation. Both MW (P) & MVAR (Q) – constant

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Power System Analysis : Introduction : Modeling of Components For Load Flow Analysis |