Engineering BE Electrical Engineering Sem 7 May 2023 2023 ELEC BE7Electrical Power System III Question Paper - Mumbai University | munotes
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Questions asked in this paper
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Q1 Attempt any four of the following 20 marks
- a) Explain why frequency control loop and voltage control loop are not 05
- b) For following fill in the blanks, all = 0 05 Define power system stability and classify it on the basis of nature of 05
- d) State assumptions made in transient stability studies 05
- e) In turbine speed governor system APc is unit step ,Af =0, R=2.5, 05 Ksg=1,Tsg=0.4, Determine AYE at
- a) A simple two-bus power system is shown in fig 10 0.5+ 0.25 j (Load) V2 | =1.0 p.u (Bus 2 is PV bus). Obtain 52 and at the end of first iteration
- b) For the network shown in figure obtain the complex bus bar voltage at at the end of the first iteration. Use the Gauss seidal method. Line impedances are given in pu Given Bus | is slack bus with V; =1<0 1.46 Assume =1.02<0
- a) Determine the economic operation point for three thermal units delivering a 10 total load of 600 MW with considering generator limit
- b) Derive formula for Bmn coefficients in transmission loss formula 10
- a) Find the steady state power limit of a system consisting of a generator 10 equivalent reactance 0.5 p.u connected to an infinite bus through a series reactance of 1.0 p.u. The terminal voltage of the generator is held at 1.2 p.u and the voltage of the infinite bus is 1 p.u direct axis transient reactance xd’ = 0.3 p.u is connected to an infinite bus through a purely reactive circuit as shown in the figure below. Reactances are marked on the diagram on a common system base. The generator is delivering real power Pe=0.8 pu and Q=0.074 pu to the infinite bus at voltage v=1 pu. A temporary three phase fault occurs at the sending end of the line at point F When the fault is cleared, both the lines are intact. Determine the critical clearing angle and the critical clearing time
- a) Draw turbine speed governor system and explain briefly 4 major parts in it 10
- b) Explain dynamic response of change in frequency for step change in load of — 10 an isolated power system. How dynamic response changes with integral
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Q6 Write short notes on 20 marks
- a) power pool and its advantages and disadvantages 10
- b) System state classification of power system security 10
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