PSOC TWO MARK UNIVERSITY QUESTIONS

Unit 2:

1. Components of speed governor system (2 times)2. Function of Speed changer in LFC3. Function of governing mechanism in a generating plant4. Define LFC5. Write the steps of experimental determination of area frequency response of a two

area PS in connection with LFC

Unit3:

1. Define long term hydrothermal scheduling problem2. State load management problem using pumped hydro plant

Unit 4:

1. State UC Problem2. Need of UC problem3. List the constraints of UC Problem4. Coordination equation of N thermal units5. Use of participation factor6. Advantages of Forward DP method7. Significance of equality & Inequality constraints in the formulation of optimum

dispatch problem

Unit 5:

1. Draw the state transition diagram (4 times)2. Define ECC3. Function of ECC4. What is data acquisition of SCADA5. Main function of SCADA6. Important role of data acquisition in Control centre7. What is meant by polling with reference to SCADA?8. What is EMS? Write its major function (2 times)9. Aim of State estimation10. Name the various state estimation algorithm11. Difference between static and dynamic State estimation (2 times)12. What is tracking state estimation?13. Explain why online load flow cannot replace state estimation in PS14. Use of pseudo measurement in State estimation15. Function performed by data logger16. How will you suppress bad data?17. Different control action necessary to enhance the security level of the system

APSA TWO MARK UNIVERSITY QUESTIONS

Unit: 1

1. Why the Y-bus of a large network is sparse?2. What is the necessity of preserving sparsity of Y-bus of a large PS?3. Advantages of sparse matrix techniques for large PS (2 times)4. Name the different types of storage schemes for sparse symmetric matrix5. What is the percentage of sparsity for a matrix of 36 elements with 20 zero

elements?6. Determine the no of fill-ins for the given network

7. Advantages of optimal ordered triangular factorization.8. Solve using GE Method

2x+y=3; 7x-3y=49. Advantages of Bi factorization method over GE method.

Unit 2:

1. Write the polar form of Power flow equation2. Write the real variable form of power flow equation3. What are the types of buses in the power network?4. What is slack bus & how it is selected? (2 times)5. What is the need of Slack bus in PS?6. Why one bus in a PS is designated as slack bus for LF study?7. Distinguish between swing bus & generator bus (2 times)8. For a PS with 30 buses, 45 lines & 12 generator buses, what is the dimension of

jacobian matrix and no of non zero element in the bus admittance matrix?9. What are the jacobian elements eliminated in FDLF method? Why?10. On what assumption the elements J2, J3 of the Jacobian matrix are set to zero in

FDLF method11. How the bus loads & generator outputs are represented in power flow problems? Are

these representations are valid for stability analysis?

Unit3:

1. What is meant by OPF?2. What is the purpose of OPF program?3. Application of OPF4. What is a security constrained OPF?5. What is meant by bus incremental cost? (2 times)6. Disadvantages of Gradient & Newton’s Method of OPF 7. Write the advantages of interior point algorithm

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Unit 4:

1. Mention the objectives of SC analysis2. List the various types of faults on transmission lines3. Differentiate symmetrical & unsymmetrical faults4. What are the causes of unsymmetrical fault in a PS?5. What is the most severe fault in the power system? Why?6. List out the approximations normally used in modelling for SC analysis7. Why sequence networks are used in unsymmetrical fault calculations?8. Draw the sequence network for a L-G Fault9. The 3 ɸ fault level of 220kV bus is 40 pu on 100MVA base. What is the positive

sequence thevenin impedance looking into the bus in Ohms?10. The Z-bus method in very suitable for fault studies on large system. Why?

Unit 5:

1. Mention the methods to improve transient stability limit