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In respect of the power flow problem, the following four variables are associated with
each bus
Question 2
When line losses are neglected, simpler expressions for line parameters are
obtained. How are the expressions of the exact
Question 10
Th goal of the equal area criteria in transient stability is to determine whether a system
is stable or not without having to completely integrate the system response. The
system will be stable after the fault if:
(1) The acceleration area is greater than 1.0 per unit.
(2) The acceleration area is greater than the deceleration area.
(3) The deceleration area is smaller than the acceleration area.
(4) The deceleration area is greater than the acceleration area.
Question 1
Which of the following is an advantage of using bundled conductors in transmission
lines?
(1) They reduce radio interference and corona at the cost of increasing line series
reactance.
(2) They reduce line series reactance, radio interference and corona.
(3) They increase line charging reactance and series reactance.
(4) They have high tensile strength and increase the skin effect.
Find I1,I2,I3,I4 and I5 by applying KVL or KCL of given circuit
Question 5
Because of the nature of the power flow bus data, nodal equations do not directly fit
the linear-equation format, and power flow equations are actually nonlinear. However,
the Gauss-Siedel method can be used for the power flow solution.
(1) True.
(2) Only true for systems with less than 14 buses.
(3) False.
(4) Only true for systems with fully transposed transmission lines.
Multiple Choo questions
Question 10
Question 8
The economic dispatch problem describes:
(1) How the real power output of a controlled generating unit is selected to meet a
given load and to minimize the total operating cost
(2) How the reactive power output of a controlled generating unit is selected to meet
a given load and to minimize the total operating cost
(3) How the levels of power generation can be adjusted to maximise the total
operating cost.
(4) How power plants can be built economically. Question 7
The regulator:
(1) Supplies current to the rotor.
(2) Converts ac to dc from voltage transformer.
(3) Controls generator terminal voltages.
Multiple Choo questions
Question 10
Th goal of the equal area criteria in transient stability is to determine whether a system
is stable or not without having to completely integrate the system response. The
system will be stable after the fault if:
(1) The acceleration area is greater than 1.0 per unit.
(2) The acceleration area is greater than the deceleration area.
(3) The deceleration area is smaller than the acceleration area.
(4) The deceleration area is greater than the acceleration area.
Allow the user to input from the keyboard the desired percent overshoot
Design a PI controller and gain to yield zero steady-state error for a closed-loop step response as well as meet the percent overshoot specification
Display the compensated closed-loop step response
Test your program on and 25% overshoot
Power station A delivers 640 MVA to its consumers at a power factor of 0.766 lagging.
Power station B delivers 560 MVA to its consumers at a power factor of 0.7071 lagging.
Two three-phase generating power stations A and B work at (86.077+j18.296) kV and (131.277+j13.798) kV respectively.The two power stations are inter-connected via a transmission line with an impedance of (6.59+j16.672) Ω/phase. The phase-regulator at power station A is adjusted such as to reduce the loading at power station A by 82 MW.
Take machine A as leading machine.
Use standard formulae to the following calculations.
Determine the total active power delivered or received by Power station A (Pi) in MW
