NPTEL Smart Grid Basics to Advanced Technologies Week 10 Assignment Answers 2024
1. ______________ transformation converts abc to dq0 reference frame.
- Park
- Clarke
- Inverse Park
- Inverse Clarke
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2. Identify the correct statements
- An under-excited synchronous generator injects reactive power into the system.
- An overexcited synchronous generator injects reactive power into the system.
- Normally excited synchronous generator operates at a leading power factor
- All are correct
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3. Identify the correct statements
- The battery and supercapacitor are connected to an Isolated DC microgrid through a unidirectional buck-boost converter.
- The battery is connected to an Isolated DC microgrid through a bidirectional buck-boost converter, not a supercapacitor.
- The battery and supercapacitor are connected to an Isolated DC microgrid through a bidirectional buck-boost converter.
- Neither a battery nor a supercapacitor can be connected to an isolated DC microgrid.
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4. What is not true in the case of the Isolated mode of operation in the AC microgrid?
- Grid is not available.
- The PV will always operate in MPPT condition.
- Battery either charge/discharge based on the reference command.
- None of the above
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5. An OLTC is connected between nodes 1 and 2, regulating the voltage at node 2 w.r.t. node 1. The voltage at node 1 is 1 p.u., and the tap position of OLTC is -10. Compute the voltage at node 2.
- 1.0625
- 0.9375
- -10
- 10
Answer :-
6. In the steady-state operation of the transmission grid, the voltage magnitudes are regulated in the range of __ p.u.
- [0.9, 1.05]
- [0.95, 1.05]
- [0.95, 1.1]
- [0.9, 1.1]
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7. What is not true in the context of parallel inverter operations?
- In renewable energy applications, inverters are connected in parallel mainly to increase the generation capacity.
- Most of the PV and wind plants consist of parallel-operated identical inverters Power sources.
- In grid-connected mode, all the inverters act as parallel connected current sources.
- None of the above
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8. Select the correct statement in the context of multi-parallel inverters
- Common and interactive currents will be unstable if the poles of their characteristic equations lie in the right half of the s-plane.
- The interactive currents are the ones that flow into the grid.
- The problem of interactive and common resonance occurs in L-filtered inverters due to their first-order nature.
- All are incorrect
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9. Select the correct statement
- Nonlinear loads induce harmonics in the system
- Harmonics can cause interference with telecommunication lines
- DVR is a power quality mitigation technique
- All are correct
Answer :-
10. For an inverter with an LCL filter to be stable, it is required to ensure the stability of ______________
- Interactive and common currents
- Interactive currents
- Common currents
- Inverter with an LCL filter is always stable
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