GTU B.Tech 2020 Winter Question Papers || Gujarat Technological University
Subject Code:180906 Date:28/01/2021
Subject Name:Advanced Power System -II
Time:02:00 PM TO 04:00 PM Total Marks: 56
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BE- SEMESTER-VIII (OLD) EXAMINATION — WINTER 2020Subject Code:180906 Date:28/01/2021
Subject Name:Advanced Power System -II
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
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- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 (a) | Explain bad data detection using ?² for state estimation. | 07 |
| (b) | In state estimation using weighed least square method, what will be difference in implementation of WLSE for DC network and AC network? Explain with example. | 07 |
| Q.2 (a) | Give classification of voltage stability. Explain each in detail. Out of all which phenomenon exist the most? Why? | 07 |
| (b) | Estimate two values random variables x by weighted least square estimate method for a given measurement vector ‘Z’, weighted matrix ‘W’, and coefficient matrix ‘H’ | 07 |
| Z = [0.75, 0.25, 0.45], W= [1 0 0, 0 1 0, 0 0 1] H = [1 0, 0 1, 1 1] | ||
| Q.3 (a) | What is power system security? Explain major three function of a power system security and system state classification. | 07 |
| (b) | For a transmission line connected between two buses, derive the expression of voltage regulation and also establish from the phasor diagram and the equations that the Q and V have a strong coupling. | 07 |
| Q.4 (a) | Explain emergency control in power network with an example. | 07 |
| (b) | Discuss relation of voltage stability and rotor angle stability. | 07 |
| Q.5 (a) | Explain the characteristics of (i) the receiving end voltage of a basic power transmission system for varying system reactance and, (ii) the characteristic of voltage V/s system short circuit capacity for any fixed value of real power flow considering leading, u.p.f. and lagging power factors load. | 07 |
| (b) | A lossless three phase 50Hz transmission line has inductive reactance of 0.50 O/km while capacitive admittance of 60 uS/km. If the system voltage at the sending end is 220KV(L-L) and the line length is 150 km., find
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| Q.6 (a) | Using Econometric models explain Long Term Load Predictions. | 07 |
| (b) | What are the reasons for voltage collapse ? and explain in detail that how they lead to voltage collapse. | 07 |
| Q.7 (a) | Explain in detail, importance of load forecasting. Discuss regression analysis for short term load forecasting with example. | 07 |
| (b) | Explain the operation of synchronous condenser in steady state using V-I characteristics. Provide its application. | 07 |
| Q.8 (a) | What do you mean by deregulated power system? How it is useful? What are the entities in deregulated power system ? List disadvantages of deregulated power system. | 07 |
| (b) | Write in detail about black out in power system. | 07 |
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