College of Engineering

Department of Electrical Engineering

Power System Analysis

(ELEC321)

Lab 03: Building 5 Bus System in Powerworld Simulator

Submitted to:

Sijoy Raphael

Submitted by:

Noor Alam Chowdhury

200915342

March 18, 2013

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1. Objective

The objectives of this experiment are:

1. To build a 5 bus system involving transformers.

2. To include a PV bus in a power system

3. To learn how to install a capacitor for voltage correction.

2. Background Information

PowerWorld Simulator is an interactive power system simulation package designed to simulate

high voltage power system operation on a time frame ranging from several minutes to several days.

The professional version contains a highly effective power flow analysis package capable of

efficiently solving systems of up to 100,000 buses, but the free student version is with limited

capabilities.

The main feature of the software is its intuitive user friendly GUI. Apart from the standard features,

the software have the ability for upgrading with several add-ons which is utility based.

3. Equipment Required

Power World Student Version 17.

Computer with Windows 7

4. Schematic Diagram

Figure 1.

Table 1: Bus input data

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Table 2: Line input data

Table 3: Transformer input data:

5. Procedure:

At first by using the parameters given in Table 1, 2 and 3 the model shown in figure 01 is

created.

After that using the power world simulator the model has been simulated and observation

of the voltage values in each bus were taken. The simulation figure is shown in figure 02.

Next the per unit voltage value was increased by using a capacitor at 2nd bus. The model is

shown in figure 03.

With the capacitor in circuit, trip the line from bus 5 to bus 2, which is shown in figure 04.

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6. Snapshots:

Figure 02: Five bus system power network simulation

Figure 03: Five bus system power network simulation with capacitor

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Figure 04: Five bus system power network simulation without connecting from bus 5 to 2

7. Discussion

a. From the figure 2 we can see that the per unit voltages at bus 1,5,3 and 4 are acceptable.

But at bus 2 per unit voltage is .83, which is too low. In this case load at bus 2 will not

get desire voltage.

b. To improve the voltage at bus 2 we connect a 200 Mvar capacitor in the 2nd bus. And

observe that per unit voltage increased from .83 to .96, which is acceptable for our load.

We can increased the voltage up to 1 p.u by increasing the capacitor, but in this case the

cost will be higher.

c. As we can see from figure 04 that the system is crashed when we trip the line from bus 5

to 2. This happens because of the generated voltage is less than the desired voltage.

d. Uses of capacitor in a power network:

Capacitor mainly used in a power network to improve the power factor. There are many

ways to improve the power factor, but the capacitor method is cheaper and easy to build.

Synchronous capacitor:

Synchronous capacitor are mainly called synchronous condenser. Its characteristics

matches the characteristics of synchronous motor. But the main purpose of this element is

to adjust the condition on the electric power transmission grid. By adjusting the

transmission grid it improves the power factor on the bus.

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8. Rubric for the report

Attribute and

Weight

Poor (1) Fair (2) Good (3) Excellent (4) Weighted

Score

pdf Copy

(10%)

No pdf copy

provided

pdf copy

provided

Cover Page

(10%)

No cover page Cover page with

University name,

Program name,

experiment # and

experiment name

Cover page with

University name,

Program name,

experiment #,

experiment

name and

student details

Cover page with

University

name, Program

name,

experiment #,

experiment

name, student

details and

instructor details

Snapshot of

the

simulation

run

(50%)

No snapshot

provided

1 relevant

snapshot

provided

2 relevant

snapshot

provided

3 relevant

snapshot

provided

Discussion

(30%)

No/1 part of the

discussion as

mentioned in the

procedure

Only 2 parts of

the discussion as

mentioned in the

procedure

3 parts of the

discussion as

mentioned in the

procedure

Complete

discussion as

mentioned in the

procedure

Total Points

(100%)