52223-mt----power System Operation & Control

NR

Code No: 52223/MT

M.Tech. – II Semester Regular Examinations, September, 2008 POWER SYSTEM OPERATION & CONTROL (Common to Electrical Power Engineering/ Power Systems (High Voltage)) Time: 3hours

1.a) b) c) 2.a) b)

3.a) b) 4.a) b)

Max. Marks:60

Answer any FIVE questions All questions carry equal marks --Explain what is meant by spinning reserve. Explain about thermal constraints that are to be used in unit commitment problems. Discuss about priority list method in sloving the unit commitment problem. Explain with the help of flow chart the forword dynamic programming solution for solving unit commitment problem. Consider the data of a system having four generating units with the parameters listed in table. Find the most economical units to be committed for a load of 6 Mw with the load changes in steps of 1.5 Mw. Explain with the help of a schematic diagram of load frequency and excitation voltage regulators, the basic control strategies of a turbo generator. Discuss about the dynamic response of a single area system of an isolated area. Explain with the help of a block diagram, the economic dispatch control problem of a control area. Discuss with the help of block diagram, the proportional plus integral control of the load frequency problem and hence derive the expression of frequency deviation.

5.

Develop the block diagram representation of two area control system with integral control.

6.

Develop the state space model for optimal control of a two area system and hence derive the expression for performance index.

7.a)

Explain the gradient search method based an simple search with the help of a block diagram. Contd…2.

Code No: 52223/MT

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b)

Discuss about hard limits and stack variables that are to be necessarily used in composite generation cost function.

8.

Write (a) (b) (c)

short notes on: Interchange evaluation with unit commitment Advantages of DP methods over priority list scheme Hydro constraints.

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