Download PTU M.Tech. EE 1st Semester 38806 POWER SYSTEM OPERATION and CONTROL Question Paper

Roll No.

Total No. of Questions : 08

Total No. of Pages : 02

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M.Tech.(Pow system.) (Sem.-1)

POWER SYSTEM OPERATION & CONTROL

Subject Code : PEE-501
M.Code: 38806

Max. Marks : 100

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INSTRUCTIONS TO CANDIDATES :

1. Attempt any FIVE questions out of EIGHT questions.
2. Each question carries TWENTY marks.

1. a) Draw and explain characteristics of hydro units. (10)
   

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   b) What is penalty factor in economic scheduling and B matrix loss formula? (10)
2. a) Develop an algorithm for solving the optimum dispatch equation of an 'n' bus power system taking into account the effects of system losses. (15)
   b) What are the constraints of optimal power flow? (5)
3. a) Explain with a block diagram the model of LFC for an isolated power system. Derive overall transfer function with frequency deviation as output and change in load as input. (12)
   b) The following data is available for an isolated area: capacity 5000 MW, frequency 50 Hz, operating load 2500 MW, speed regulation constant 2 Hz/p.u. MW, inertia Constant H=5 seconds, 2% change in load for 1% change in frequency. Determine
   1. i) largest change in step load if steady state frequency is not to change by more than 0.2Hz. (4)

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   2. ii) Change in frequency as a function of time after a step change in load. (4)
4. a) What are the constraints in hydro units in unit commitment problem? Compare Economic dispatch and unit commitment. (8)
   b) In a power system consisting of two generating plants connected through a transmission line. The plants are required to operate at economical load sharing to supply 600 MW. If the fuel cost characteristics of the plants are : (12)
   
   

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   C1 = 0.056PG1² + 30 PG1 + 40; C2 = 0.05PG2² + 25 PG2 + 50; Determine the generation supplied by each plant, if the transmission line loss is expressed through
   
   PL = 0.015PG1² + 0.305PG2² + 0.2 PG1 PG2 p.u. Determine the optimal power generation if X =40Rs/Mwh.
   
   Use participation factor method to calculate the dispatch for a load of 900 MW.

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5. How do you model tie-line power flow in two area system using analytical technique? Distinguish between load frequency control and economic load dispatch control with neat block diagram. (20)
6. A two plant system having a steam plant near the load centre and hydro plant at a remote location. The load is 4000MW for 16hrs a day. The characteristics of the units are
   
   C1 = 0.075 PT² + 40? + 100
   
   

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   W2 = 0.0025 PH² + 0.5PH,
   B22 = 0.001MW^-1
   
   Find the generation schedule, daily water used by the hydro plant and daily operating cost of thermal plant for yj = 82.5 Rs/m³ –hr. (20)
7. Explain short term Hydro-Thermal energy scheduling considering losses with lambda- gamma method. (20)

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8. a) Types of interchange between interconnected utilities. (10)
   b) Explain technical and structural issues of transmission. (10)

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