Power Flow Analysis

Knowledge in Operation and Control of Modern Power Systems.

Given a single line diagram of a 14 BUS system and the power flow data given answer 5 questions.

1)Obtain the base-case power flow solution using Newton-Raphson (NR) method and

show the voltage profile of the system.

2)Using the power flow results (voltage magnitudes and angles) and line data,

calculate the complex power flow at both ends of the tap changing transformer

connected between buses 4 and 7. Compare the calculated results with the

corresponding simulation results obtained in part 1 and find the errors in


3)The reactive power of a voltage-controlled bus (or a P-V bus) depends on the

specified voltage magnitude of the bus. Vary the voltage magnitude of P-V bus 3

from 0.90 pu to 1.10 pu (with a suitable increment) and run the power flow program

and record the corresponding reactive power of the generation. You may relax the

reactive power limits of the bus (say, from -500 to +500 MVAr), if necessary. Plot the

variation of reactive power against terminal voltage of the generator. At the end of

this part, reset the reactive power limits of the bus to the original values.

4)The voltage magnitude of a load bus (or a P-Q bus) depends on load of the bus.

Select a particular load bus and increase the load of the bus at a constant power

factor (0.85 lagging) in step (start at 10 MVA) and obtain the corresponding voltage

from power flow solutions. Continue to increase the load until the voltage of the bus

decreases to 0.8 pu. Plot the load voltage against load MVA of the bus. Suppose a

100 MVAr shunt capacitor bank is connected to the load bus when its voltage is

decreased to 0.8 pu, determine the improvement of voltage of bus using suitable

simulations. At the end of this part, reset the data to the original values.

5)Consider the system load is decreased to 60% during off-peak period and increased

to 140% during peak period. Compare the voltage profile of the system during peak

and off-peak periods.

Kemahiran: Kejuruteraan, Matlab and Mathematica

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( 4 ulasan ) singapore, Singapore

ID Projek: #10108775

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