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DEE-23216 Introduction to Smart Grids and Renewable Energy — P. Järventausta & S. Valkealahti
Exam 19.10.2018

 

You can answer in English or in Finnish

1. Are the following statements true?
You have three options to be selected: Y = yes, N = no and DK = don't know. Right answer
means one point and wrong answer one minus point. If you choose the option DK (don't know),
you will get zero point. Maximum is 6 point and minimum O point in all.

a)
b)

c)

d)

The CO? content in the atmosphere is practically the same in all countries all over the world.
The resources of coal will last the longest time, if the consumption of all known energy
resources continues to be at the same level as today.

New annual discoveries of natural gas have been smaller than the annual gas consumption
during the last 30 years

Distributed generation along the medium voltage feeder may raise the voltage level of the
feeder.

Relay protection practices are simpler and power losses are higher in meshed (i.e. ring)
configuration of power grid than in radial configuration.

A micro grid can be determined as a segment of Smart Grid with intended island operation
capability.

2. a) What are the main differences and advantages of electrical energy with respect to non-

renewable sources of energy? (3p)

b) What are the available resources of energy related to water? (3p)

3. Explain briefly

a) The effect of atmosphere on the intensity of incoming solar radiation to the surface of the

earth. (3p)

b) The dependence of the power available for the turbine of a windmill and the speed of the

wind. (3p)

4. a) List the main benefits which can be achieved by *Demand Response” (3p)
b) Explain briefly the different roles that Electric Vehicles (cover full EVs and PHEVs) may

have in Smart Grids (3p)

5. Compare briefly

a) Traditional distribution grid and Smart Grid (you can use also a figure) (3p)

b) The roles of electricity retailer and Distribution System Operator (DSO) (3p)