Power System Analysis (EE-452)

EE - 072,097,100,104,303

Section: C Instructor: Ms. Samiya Zafar

1 NED University of Engineering & Technology Department of Electrical Engineering Batch: 2011-12

Post Lab # 01

Title: Introduction to MATLAB and to model an electrical power system on MATLAB Simulink.

Simulation Software :

Simulation software used in this lab is MATLAB Simulink. Simulink, developed by MathWorks, is

a data flow graphical programming language tool for modeling, simulating and analyzing multi-

domain dynamic systems. Its primary interface is a graphical block diagramming tool and a

customizable set of block libraries. It offers tight integration with the rest of the MATLAB

environment and can either drive MATLAB or be scripted from it. Simulink is widely used in control

theory and digital signal processing for multi-domain simulation and Model-Based Design.

Component Blocks:

Three Phase Source

Three Phase V-I Measurement

Three Phase Transformer (Two Winding)

Scopes

Active And Reactive Power

Pi Section Line

Three Phase Circuit Breaker

Three Phase Series RLC Load

Power GUI

Lab Procedure:

For modeling the power system following steps is to be done:

1. Open Simulink library through a command simulink on a MATLAB command window.

2. From Simulink library window start new model.

3. In Simulink block library; SimPowerSystems which includes component blocks and tools of

electrical power systems.

4. Connect a three phase source of 11kV following a bus bar(three phase VI measurement)

with three phase two windings step up transformer (11/66 kV).

5. Connect two scopes and active & reactive power block in between the scopes

6. Connect three single phase pi section line at the output of transformer.

7. Connect a step down three phase two windings transformer (66/11 kV).

8. At the output of step down transformer again connect a bus bar (three phase VI

measurement) with two scopes and active & reactive power block.

9. A three phase series RLC load is connected via three phase breaker,

10. After connecting all of these adjust the parameters specified by the requirement.

11. Use powergui for guiding a MATLAB simulator.

Power System Analysis (EE-452)

EE - 072,097,100,104,303

Section: C Instructor: Ms. Samiya Zafar

2 NED University of Engineering & Technology Department of Electrical Engineering Batch: 2011-12

12. For reducing the simulation time change the mode from ode45 to ode23tb (stiff/TR-BDF2) in

configuration parameters listed at Simulation tab at top of the model window.

13. Run simulation and check the output in all scopes.

Observation:

Familiarity with MATLAB Simulink environment is accomplished. SimPowerSystem Blocks are studied

and their implementation in Simulink is understood.

Findings and Conclusion:

It can be seen from the Simulink model that a transmission line, in order to have maximum efficiency

should have proper devices like a transformer and an efficient power generating source. Moreover,

safety of the transmission line should also be taken into account i.e. a circuit breaker of the desired

rating should also be installed in case of any malfunctioning or fault of the system.