Important RGPV Question
EX-601 Power System-II
VI Sem, EX
UNIT 1- General-Problems Associated With Modern Interconnected Power Systems
Q.1) Two power plants A and B are interconnected by a short line. Capacity of A is 200 MW and that of B is 100 MW. Their speed regulations (from no load to full load) are 1.5% and 3% respectively. The load on bus of each station is 100 MW. Find the generation at each plant and transfer of power through line.
(RGPV May 2024)
Q.2) In interconnected system how the real and reactive power is controlled explain.
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Q.3) Explain the followings related to modern power system
i) Deregulation
ii) Restructuring
iii) Distributed generation
(RGPV May 2022)
Q.4) What do you understand by restructuring process? Describe various entities involved in restructuring process.
(RGPV Dec 2020)
UNIT 2- D.C. Machine-II
Q.1) Compare the performance of Gauss-Seidel and Newton-Raphson methods for load flow solution. Explain the method of formation of YBus.
(RGPV May 2024)
Q.2) What is the significance of load flow analysis in a power system? Give the classification of various types of buses in a power system for load flow studies. Justify the classification.
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Q.3) Using Gauss-Seidel method give a flow chart for a load flow study on a power system having only P-Q buses. What modification is made in the flow chart to account for PV buses? Discuss.
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Q.4) Explain the Newton-Raphson method with flow chart for load flow solution.
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Q.5) Explain to calculate available transfer capacities using ac power flow analysis.
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Q.6) Compare various load flow solution methods.
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Q.7) Explain Gauss-Seidel method of power flow analysis.
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Q.8) Determine YBus for the 4-bus system if the line series impedances are as follows: Neglect shunt capacitance of the line. (RGPV Dec 2020)
Q.9) What do you understand by economic dispatch? Discuss the main objectives of economic dispatch and load dispatch centers.
(RGPV Dec 2020)
UNIT 3- MW Frequency Control-
Q.1) Define Economic operation of power system.
(RGPV May 2024)
Q.2) Explain the effect of load change on frequency of generating voltage. Describe the primary and secondary control of load and frequency.
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Q.3) Explain why it is necessary for keeping strict limits on the system frequency variations.
(RGPV Dec 2020)
UNIT 4- Friction
Q.1) What are the types of excitation systems? Draw the functional block diagrams of them and briefly describe the various elements of the block diagrams.
(RGPV May 2024)
Q.2) Explain the DC excitation system with amplidyne voltage regulator.
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Q.3) By the phasor diagram and equation, show that the voltage drops is almost due to the reactive power.
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Q.4) Explain with block diagram the brush less excitation system of synchronous generators.
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Q.5) 50 Hz 4 pole turbo generator rated at 20 MVA 13.2 kV has an inertia constant of H=9 KW-sec/KVA. Find the kinetic energy stored in the rotor at synchronous speed.
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Q.6) Explain the various limiting features in the excitation system of a synchronous generator.
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Q.7) Develop the correlation between reactive power and voltage regulation of a transmission line. How shunt capacitor, series capacitor and shunt reactor helps in voltage regulation.
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Q.8) Discuss in detail about generation and absorption of reactive power in Power System Components.
(RGPV Dec 2020)
Q.9) Explain the working of automatic voltage regulators.
(RGPV Dec 2020)
UNIT 5-Reactive Power & Voltage Control
Q.1) Derive the relation for linearized swing equation for small incremental changes and find out the steady state stability limits. What are the causes of instability.
(RGPV May 2024)
Q.2) Derive Swing equation and discuss the equal area criteria for power system stability.
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Q.3) Explain steady state and transient stability of a generator connected to infinite bus. Also describe the influence of the different factors on the transient stability.
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Q.4) Derive the swing equation and discuss its application in the study of power system stability.
(RGPV Dec 2020)
Q.5) Differentiate between steady state and transient stability of a
power system. Discuss the factors that affect
i) steady state stability
ii) transient state stability of the system.
(RGPV Dec 2020)
Extra Questions-
Q.1) A 100 MVA synchronous generator operates on full load at a frequency of 50 Hz. The load is suddenly reduced to 50 MW Due to time lag in governor system, the steam valve begins to close after 0.4s. Determine the change in frequency that occurs in this time.
(RGPV May 2024)
Q.2) Define modeling of turbine speed governing system.
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Q.3) Write a short notes on (any two)
i) Economic dispatch using lagrangian multiplier method.
ii) Modeling of tie line.
iii) Protection and absorption of Reactive power method of voltage control.
iv) Pricing of energy and transmission service.
(RGPV May 2024)
Q.4) Write short notes on followings:
i) Classification of buses
ii) Penalty factor and Loss coefficients
iii) Admittance matrix
(RGPV May 2022)
Q.5) A 100 MVA 50 Hz turbo alternator operates at no load at 3000 rpm. A load of 25MW is suddenly applied to the machine and the steam valves to the turbine commence to open after 0.6 secs due to the time lag in the governor system. Assuming inertia constant H of 4.5 kw-sec per KVA of generator capacity, calculate the frequency to which the generated voltage drops before the steam flow commences to increase to meet the new load.
(RGPV Dec 2020)
Q.6) A turbo alternator with 4-pole, 50Hz, 80 MW, 0.8 lag and moment of inertia 40,000 kgm2 is interconnected via a short transmission line to another alternator with 2-pole, 50Hz, 100MW, p.f. 0.8 lag and moment of inertia 10,000 kgm2. Determine the inertia constant of the single equivalent machine on a base of 100MVA.
(RGPV Dec 2020)
Q.7) A 50 Hz generator is delivering 50% of the power that is capable of delivering through a transmission line to a infinite bus. A fault occurs that in creases the reactance between the generator and the infinite bus to 500% of the value before the fault. When the fault is isolated, the maximum power that can be delivered is 75% of the original maximum value. The determine the critical clearing angle for the condition described.
(RGPV Dec 2020)
— Best of Luck for Exam —
