Power System‑II (EX-601) - Important Questions

Explain the restructuring process and describe the various entities involved in it.

Explain to calculate available transfer capacities using AC power flow analysis.

Why the interconnected power system is necessary? Explain the problems associated with them.

What is deregulation in the power system, its effects, and how can they be overcome?

Explain deregulation, restructuring and distributed generation in the modern power system.

Explain the Gauss-Seidel method for power flow / load flow analysis, including algorithm/flow chart for PQ buses and modification for PV buses.

Compare various load flow / power flow solution methods used in power system analysis.

Write a short note on economic dispatch.

Determine the $Y_{bus}$ for the 4-bus system from given line series impedances neglecting shunt capacitance.

Write a short notes on (any two)

Compare the performance of Gauss-Seidel and Newton-Raphson methods for load flow solution and explain the method of formation of $Y_{bus}$.

Define economic operation of a power system.

Explain the significance of load flow analysis and classify the types of buses for load flow studies with justification.

Explain the Newton-Raphson method with flow chart for load flow solution.

Write short notes on classification of buses, penalty factor and loss coefficients, and admittance matrix.

Calculate the frequency drop/change due to sudden load addition or rejection before governor action, given MVA rating, inertia constant H, power imbalance and governor time lag.

Explain why it is necessary to keep strict limits on power system frequency variations.

Two interconnected power plants with given capacities and speed regulations supply given bus loads; determine generation at each plant and power transfer through the tie line.

Explain how real and reactive power are controlled in an interconnected power system.

Define modeling of turbine speed governing system.

Explain the effect of load change on frequency of generating voltage. Describe the primary and secondary control of load and frequency.

Explain generation/production and absorption of reactive power in power system components and methods used for it.

Discuss the various voltage control methods used in power systems.

Explain the working of an automatic voltage regulator for generators with the help of a block diagram.

What are the types of excitation systems? Draw their functional block diagrams and describe the elements.

Explain the DC excitation system with amplidyne voltage regulator.

Using phasor diagram and equations, prove that voltage drop in a transmission line is mainly due to reactive power.

Explain with block diagram the brushless excitation system of synchronous generators.

What is the need for an excitation system? Explain the AC static excitation system.

Explain the various limiting features in the excitation system of a synchronous generator.

Derive the relationship between reactive power flow and voltage drop/regulation of a transmission line and explain how shunt capacitor, series capacitor and shunt reactor improve voltage regulation.

Determine the critical clearing angle by equal-area criterion given the pre-fault power delivered and the pre-fault, during-fault and post-fault maximum power transfer capabilities.

Derive the swing equation and explain its significance / application in rotor angle stability studies.

Explain / differentiate steady-state vs transient stability of a generator / power system connected to infinite bus and discuss factors affecting steady-state and transient stability.

Determine the inertia constant of the single equivalent machine for two interconnected alternators on a common MVA base.

Discuss the various methods of improving steady-state stability in a power system.

Find the energy stored in the rotor at synchronous speed and the rotor acceleration for a given mechanical input and electrical load.

Find the kinetic energy stored in the rotor at synchronous speed from the inertia constant.

Derive the linearized swing equation for small incremental changes, determine the steady-state stability limit, and state causes of instability.

Derive the swing equation and discuss the equal area criterion for power system stability.