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

Answer :-

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

Answer :-

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