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Exp. No: Date: Formation of Y-Bus Matrice by Direct Inspection Method Aim: To Determine The Admittance Matrices For The Given Power System Network

The document describes forming the Y-bus admittance matrix for a power system network using the direct inspection method in MATLAB. It provides the theory behind bus admittance matrices and Y-bus formation. The procedure involves entering MATLAB, creating an M-file, typing the program, executing it, and viewing the results. As an example, it gives the line data for a sample power network and shows manually calculating its Y-bus matrix.

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Snehil Chandra
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4K views5 pages

Exp. No: Date: Formation of Y-Bus Matrice by Direct Inspection Method Aim: To Determine The Admittance Matrices For The Given Power System Network

The document describes forming the Y-bus admittance matrix for a power system network using the direct inspection method in MATLAB. It provides the theory behind bus admittance matrices and Y-bus formation. The procedure involves entering MATLAB, creating an M-file, typing the program, executing it, and viewing the results. As an example, it gives the line data for a sample power network and shows manually calculating its Y-bus matrix.

Uploaded by

Snehil Chandra
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Exp.

No:
Date:
FORMATION OF Y-BUS MATRICE BY DIRECT INSPECTION METHOD
Aim: To determine the admittance matrices for the given power system network.

SOFTWARE REQUIRED: MATLAB

THEORY:
Bus admittance is often used in power system studies. In most of the power system studies
it is required to form Y- bus matrix of the system by considering certain power system
parameters depending upon the type of analysis.
Y-bus may be formed by inspection method, only if there is no mutual coupling between
the lines. Every transmission line should be represented by - equivalent. Shunt
impedances are added to diagonal element corresponding to the buses at which these are
connected. The off diagonal elements are unaffected. The equivalent circuit of Tap changing
transformers is included while forming Y-bus matrix.
FORMATION OF Y-BUS MATRIX

11 . 1
Generalised Y-bus = [ ]
1

where,
Yii = Self admittance
Yij = Transfer admittance

PROCEDURE:
1. Enter the command window of the MATLAB.
2. Create a new M file by selecting File - New M File
3. Type and save the program in the editor window.
4. Execute the program by either pressing Tools Run.
5. View the results.
I. EXERCISE:

(i) Determine the Y bus matrix using direct inspection method for the power system network
shown in fig. (ii) Check the results obtained in using MATLAB.

Input Data:

z = [0 1 0 1.0; 0 2 0 0.8; 1 2 0 0.4; 1 3 0 0.2; 2 3 0 0.2; 3 4 0 0.08];

MANUAL CALCULATIONS:
Flow chart:
Start

Read the line data from



bus, to bus, R, X,
2

Compute the line admittance

1
= =
+

Compute the no of bus n =


max(from bus, to bus)

I=1
2
Computation of diagonal element

= 1 + 2 + 3 + + +

J=1

If I j

Compute the off diagonal element =

J = j+1

Yes 1
J <=n
No
I = i +1
Print the Y-
Yes bus elements
2 I <=n

No

1
END
Result:

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