POWER SYSTEM SIMULATION LAB - I

FORMATION OF BUS ADMITTANCE AND IMPEDANCE MATRICES AND

SOLUTION OF NETWORKS

To understand the formation of network matrices, the bus admittance matrix Y and the bus impedance matrix Z of a power network, to effect certain required changes on these matrices and to obtain network solution using these matrices.

AIM

EXERCISES

• Using AU power software for formation of bus admittance matrix Y of a power network using the “Two – Rule Method”.

ANNEXURE 3.13-BUS, 3-LINES POWER SYSTEM

Transmission Line Data:

3-BUS, 3-LINES POWER SYSTEM Single-Line Diagram

Base MVA = 100

1 2

3

i. General Data

Number of buses, number of transmission lines, number of transformers, number of shunt elements (capacitor / reactor) and the base MVA of the network.

ii. Transmission Line Data

The following data to be read for all lines, (one line for each transmission line)

(a)Identification number (serial number) of line

(b) Identification number of sending end and receiving end buses of line

(c) Series impedance (R,X)of the line in per unit.

(d) Half-line-charging susceptance, Bc, in per unit.

(e) Maximum loadability limit (rating) of line in MVA

iii. Transformer DataThe following data to be read for all transformers (one line for each transformer):

a.Identification number (serial number) of transformer

b. Identification number of sending end (tap side) bus and receiving end bus of transformer.

c. Impedance (R,X) of transformer in per unit.

d. Off-nominal tap ratio

e. Maximum loadability limit (rating) of transformer in MVA

iv. Shunt element (capacitor / reactor) Data

• The following data to be read for all shunt elements (one line for each element):

a. Identification number (serial number) of the shunt element

b. Identification number of the bus

c. Rated capacity in MVA (positive for capacitor and negative for inductor).

Output Section:

(i) Student Information: • Title of the Experiment : • Case Title• Name of the Student : • Roll Number : • Semester : • Date of Experiment :

(ii)Input Data with proper headings :

(iii) Results with proper headings: Element value (in per unit) of Y printed row wise.•

STUDENT INFORMATION DATA

• TITLE OF EXPERIMENT:FORMATION OF NETWORKS MATRICES AND SOULTION OF NETWORKS L1 Y-Z SOL MODULE L2

• CASE TITLE:3-BUS 3-LINE SYSTEM L3

• NAME OF THE STUDENT/USER:S.MATHAN KUMAR L4

• ROLL NUMBER:TF / EEE / 02 L5

• SEMESTER:ASSO. PROF (EEE) L6

• DATE OF EXPERIMENT:22.03.2014 L7

SYSTEM DATA (L8)

NUMBER OF BUSES : 3 NUMBER OF TRANSMISSION LINES : 3NUMBER OF TRANSFORMERS : 0 NUMBER OF SHUNT ELEMENTS : 0SYSTEM BASE MVA : 100.00

*All dates are typed in ONE Single Row (Line Number or Row Number 8)

*Each data after press Tab button and then type next data

TRANSMISSION LINE DATA (Starting From L9 t0 L11)

• LINE NUMBER• SENDING BUS • RECEVING BUS • RESISTANCE (R) IN PU • REACTANCE (X) IN PU • HALF LINE CHARGING SUSCEPTANCE IN PU • RATING MVA(In Each Transmission Line having 7 Dates – This 7

dates are Typed in ONE Single Row)

6-BUS, 7-LINES / TRANSFORMER POWER SYSTEM Single-Line Diagram

i. General Data

• Buses : 6, numbered serially from 1 to 6

• Lines : 5, numbered serially from L1 to L5

• Transformers : 2, numbered serially as T1 and T2

• Shunt Load : 2, numbered serially as s1 and s2

• Base MVA : 100

Bus Data – P-V Buses:

Bus IDNo. Generation, MW Demand Gen. Limit

MVARScheduledVolt (p.u)

Schedule Max Min MW MVAR Max Min

1 ? 200 40 0.0 0.0 100.0 -50.0 1.02

2 50.0 100 20 0.0 0.0 50.0 -25.0 1.02

Bus Data – P-Q Buses

Bus ID NoDemand

Volt. Mag.Assumed (p.u)MW MVAR

3 55.0 13.0 1.0

4 0.0 0.0 1.0

5 30.0 18.0 1.0

6 50.0 5.0 1.0

Transmission Line Data

LineID. No

Send BusNo.

ReceiveBus No.

ResistP.U

ReactanceP.U.

Half LinechargingSuscept.

P.U

RatingMVA

1 1 6 0.123 0.518 0.0 55

2 1 4 0.080 0.370 0.0 65

3 4 6 0.087 0.407 0.0 30

4 5 2 0.282 0.640 0.0 55

5 2 3 0.723 1.050 0.0 40

Transformer Data

TransformerID.No

Send (*)Bus No.

ReceiveBus No.

Resist.P.U

ReactanceP.U.

Tap Ratio RatingMVA

1 6 (*) 5 0.0 0.300 1.000 30

2 4 (*) 3 0.0 0.133 1.000 55

(*) Note: The sending end bus of a transformer should be the tap side.

Shunt Element Data

Shunt ID No. Bus ID. No. Rated CapacityMVAR (*)

1 4 2.0

2 6 2.5

(*) Note: Sign for capacitor : +ve Sign for Inductor : -ve