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Following tasks the students are required to be performed by the students:

1. Identify bus type of each of the buses from the data provide in Table 1.
2. Covert bus power data in SI units using system base.
3. Convert transmission line impedance data in SI units.
4. Calculate resistance and inductance of each of the transmission line in SI unit and tabulate them.
5. Construct a SimPowerSystem model of the system under consideration.
7. Generate a load flow report of the system.
8. Analyse the load flow result of the system which should include (i) discussion on the power balance of the system, (ii) discussion on the power flow throughout  the network, and (iii) voltage magnitude and angle at the buses. Students are required to submit a report on this laboratory work. On campus students  required to individually show their developed SimPowerSystem model during the laboratory works. Cloud students are required to send their model via email to the  lecturer and discuss their results during the Blackboard session.

## Building the SimPower Systems Model

Power flow study plays a significant role in planning and design of power systems for future development in addition to determining the best operation of existing systems. Degree and phase angle of voltages at the buses, real and reactive power flowing in a transmission line are the principle facts achieved from a power flow study. SimPower Systems lets you to construct and simulate electrical circuits comprising of linear and nonlinear elements (Karris & Karris 2009). SimPower Systems is skill of the Physical Modeling surroundings. According to LI (2010), Lines that link normal Simulink ports > are referred to as signal lines while those that link terminal ports are known as electrical connection lines. Connection lines are non-directional and can be diverged. But you cannot link them to standard Simulink indication lines.

The key purpose of this laboratory work #1 is to build a model of simple power system by SimPower Systems and execute load flow studies of the system.

In this lab assignment, we are to simulate a 4 bus power system as shown in below.

• To identify bus type of each of the buses from the data provide in Table 1.
1. To covert bus power data in SI units using system base.
2. To convert transmission line impedance data in SI units.
3. To calculate resistance and inductance of each of the transmission line in SI unit and tabulate them.
4. We constructed a SimPowerSystem model of the system under consideration.
5. Load flow analysis was then performed.
6. A load flow report of the system was then generated.

Types of buses.

The types of bus represented by each bus are as follows:

Bus 1-Swing

Bus 2-Generator

Bus 3-Generator

Bus 4-Generator

Bus power in SI units.

Pbase=Qbase=Sbase=100 MVA

Pact= Sbase* Ppu    Qact= Sbase* Qpu

 Bus # Real Power Demand in MW Reactive Power Demand  in MVAR Real Power Generation MW Reactive Power Generation MVAR 1 100 50 ? ? 2 0 40 400 ? 3 200 100 0 ? 4 200 1 00 0 ?

Table 1: The actual power values in SI units:

Transmission line impedance in SI units.

Sbase=100MVA

Vbase=15kV

Zact=Zbase*Zpu

The actual impedance of the transmission lines will be given by:

 Transmission Line Reactance (ohms) Line 12 0.3375 Line 13 0.45 Line 14 0.225 Line 23 0.1225 Line 34 0.3375

Table 2: Transmission Network Data in ohms

Inductance of the transmission line in SI unit.

Since the lines are lossless therefore the resistances of lines is zero.

X=2*∏*f

Therefore:

Therefore the inductance will be:

 Transmission Line Inductances (mH) Line 12 1.0743 Line 13 1.4324 Line 14 0.7162 Line 23 0.7162 Line 34 1.0743

Table 3: Inductance

The simpower system model of the system has been attached to this report. The model is

an.m file. From the load flow analysis we obtained the following results:

The Load Flow converged in 2 iterations!

Sub network No 1 Summary

Total generation:    P= 500.00 MW       Q= 412.78 Mvar

Total PQ load:        P= 0.00 MW           Q= 0.00 Mvar

Total Zshunt load:  P= 500.00 MW       Q= 290.00 Mvar

Total ASM load:   P= 0.00 MW           Q= 0.00 Mvar

Total losses:          P= -0.00 MW          Q= 122.78 Mvar

1: BUS_1

V= 1.000 pu/15kV 0.000; Swing bus

Generation:    P= 100.00 MW       Q= 75.66 Mvar

PQ_load:        P= 0.00 MW           Q= 0.00 Mvar

Z_shunt:         P= 100.00 MW        Q= 50.00 Mvar

--> BUS_2:         P= -147.91 MW        Q= 16.62 Mvar

--> BUS_3:         P=15.55 MW            Q= 0.24 Mvar

--> BUS_4:         P= 132.36 MW          Q=    8.80 Mvar

2: BUS_2

V= 1.000 pu/15kV 12.820

Generation:      P= 400.00 MW        Q= 88.91 Mvar

PQ_load:          P= 0.00 MW             Q= 0.00 Mvar

Z_shunt:           P= 0.00 MW             Q= 40.00 Mvar

--> BUS_1:            P= 147.91 MW         Q= 16.62 Mvar

--> BUS_3:            P= 252.09 MW         Q= 32.30 Mvar

3: BUS_3

V= 1.000 pu /15kV -1.780

Generation:        P= 0.00 MW            Q= 135.98 Mvar

PQ_load:            P= 0.00 MW             Q= 0.00 Mvar

Z_shunt:             P= 200.00 MW          Q= 100.00 Mvar

--> BUS_1:              P= -15.55 MW           Q= 0.24 Mvar

--> BUS_2:              P= -252.09 MW         Q= 32.30 Mvar

--> BUS_4:              P= 67.64 MW             Q= 3.44 Mvar

4: BUS_4

V= 1.000 pu/15kV -7.610

Generation:          P= 0.00 MW          Q= 112.24 Mvar

PQ_load:              P= 0.00 MW          Q= 0.00 Mvar

Shunt:                   P= 200.00 MW      Q= 100.00 Mvar

--> BUS_1:                P= -132.36 MW      Q= 8.80 Mvar

--> BUS_3:                P= -67.64 MW         Q= 3.44 Mvar

From the load flow analysis both reactive and active was well balanced through the circuit. At bus 1 generator 1 was supplying both active and reactive power. In addition, the bus was supplying power to all the other buses except that it received real power from bus 2. At bus 2, generator 2 was supplying power to the system. Both real and reactive power was flowing to bus 1 and bus 3 from bus 1. Bus 3, received real power from bus 1 and 2 while it supplied real power to bus 4. However bus 3 supplied reactive power to all the buses. Generator 3, supplied reactive power to the system. Finally at bus 4, generator 4 supplied only reactive power while supplying zero real power to the system. The bus received real power from bus 1 and 3 while supplying reactive power to these buses.

Conclusion

The magnitude of the voltages in all the buses remained constant at 1 pu therefore operated at a flat voltage profile. However, the phase angle voltages varied from one bus to another. The phase angle voltages at the 3rd and 4th bus were lagging while at the 2nd bus voltage phase angle was leading. The phase angle of the voltage at bus 1 was zero since it was the reference bus.

Reference

KARRIS, S. T., & KARRIS, S. T. (2009). Circuit analysis I: with MATLAB computing and Simulink/SimPowerSystems modeling. Fremont, Calif, Orchard Publications. https://www.books24x7.com/marc.asp?bookid=30671.

LI, S. (2010). Power flow in railway electrification power system.

Cite This Work

My Assignment Help. (2020). Power Flow Study And SimPower Systems: A Lab Assignment. Retrieved from https://myassignmenthelp.com/free-samples/see-717-smart-grid-systems.

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[Accessed 17 July 2024].

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My Assignment Help. Power Flow Study And SimPower Systems: A Lab Assignment [Internet]. My Assignment Help. 2020 [cited 17 July 2024]. Available from: https://myassignmenthelp.com/free-samples/see-717-smart-grid-systems.

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