model wecs

Subcode
PX5071
Subject
Name
WIND ENERGY CONVERSION SYSTEMS
Sem
III
Degree
M.E. POWER ELECTRONICS & DRIVES,
M.E.POWER SYSTEMS
Branch
EEE
Staff
Name
V.BALASUBRAMANIAN
Date of
Updation
17:9:18
Part
Unit
Group
Q.
No
Question
A
1
1
1
Differentiate BETZ and SABININ’S theory.
A
1
1
2
What is nacelle?
A
1
1
3
What is the use of wind vane in the wind turbine?
A
1
1
4
What is swept area of wind turbine?
A
1
1
5
Compare HAWT and VAWT.
A
1
2
1
List out advantages and limitations of WECS.
A
1
2
2
What are the importance of TSR while designing a wind
turbine?
A
1
2
3
What is Betz limit?
A
1
2
4
List out various wind energy conversion schemes.
A
1
2
5
Write the formula for power obtained from wind.
B
1
1
1
Explain in detail about sabinin’s theory of ideal wind turbine.
Derive the sabinin’s limit of power coefficient Cp.
B
1
1
2
Explain in detail about simple momentum theory?
B
1
1
3
Draw the block diagram shows the various component of wind
turbine and explain function of each part.
B
1
1
4
Derive the equation for power obtained from the wind from
the first principles.
B
1
2
1
What are the various attributes to be taken care in the
aerodynamically designed wind turbine? Explain in detail.
B
1
2
2
Derive the Betz limit of power coefficient Cp of an ideal wind
turbine.
B
1
2
3
What are the details of C-WET’s certification of wind
turbines?
B
1
2
4
What are the environmental impacts of wind power?
Explain each case in detail.

…………..
A
2
1
1
Define thrust force, angle of attack.
A
2
1
2
Define lift and drag force of an wind mill.
A
2
1
3
What is lift and drag coefficient?
A
2
1
4
List out the factors to be considered for rotor selection of
WPP.
A
2
1
5
Define stall control of wind turbine.
A
2
2
1
What is yaw control of wind turbine?
A
2
2
2
What is pitch control of wind turbine?
A
2
2
3
Define tip speed ratio, laminar flow, turbulent flow.
A
2
2
4
Compare the performance of 3 blade and 4 blade WPP.
A
2
2
5
Draw the different blade profile for the different TSR.
……….
B
2
1
1
Explain the step by step procedure for designing the blade of a
wind mill.
B
2
1
2
Explain the factors affecting the performance rotor of a wind
mill with necessary graphs and curves.
B
2
1
3
Derive the formula for thrust force and TSR.
B
2
1
4
Explain in detail about the lift force, drag force, different loads
acting on the rotor blades with necessary diagrams and
equations.
B
2
2
1
Explain in detail different pitching mechanisms of wind mill.
B
2
2
2
Explain in detail about active stall controlled WPP and passive
stall controlled WPP.
B
2
2
3
Explain the various features of pitch controlled WPP and stall
controlled WPP.
B
2
2
4
Explain the various requirements of Power Electronic
Converters for the WPP applications.
……….
A
3
1
1
What are the assumptions used in steady state stability
analysis of wind mill generator model?
A
3
1
2
What are the assumptions used in transient state stability
analysis of wind mill generator model?
A
3
1
3
Define short circuit ratio of generator.
A
3
1
4
What are the advantages and disadvantages of fixed speed

WECS?
A
3
1
5
Compare fixed speed WECS and variable speed WECS.
A
3
2
1
Define wind modeling.
A
3
2
2
Compare SCIG and DFIG.
A
3
2
3
Compare conventional synchronous machine and PMSG.
A
3
2
4
Define weibull and rayliegh distribution for wind speed
modeling.
A
3
2
5
Draw the speed torque characteristics of induction machine.
…………
B
3
1
1
Explain the different factors to be considered for choosing the
generator for wind mill applications.
B
3
1
2
Explain steady state stability analysis for generator model for
wind mill application.
B
3
1
3
Explain transient state stability analysis for generator model
for wind mill application.
B
3
1
4
Explain different methods used for modeling of wind with
necessary equations and tabulations of data.
B
3
2
1
Derive the torque equation of induction machine and deduce
step by step equivalent circuit of it.
B
3
2
2
Explain different types of drive train modeling of wind turbine
with neat diagram and relationships of various parameters.
B
3
2
3
Draw the block diagram for the implementation of constant
speed constant frequency based WECS and explain the
function of each block in it.
B
3
2
4
Explain different type of turbines used for constant speed
WECS.
………..
A
4
1
1
What are the features of variable speed WECS?
A
4
1
2
Compare fixed speed WECS and variable speed WECS.
A
4
1
3
What is the need for variable speed WECS?
A
4
1
4
What are the pros and cons of variable speed WECS?
A
4
1
5
List out features of DFIG used for WECS.
A
4
2
1
List out the features of PMSG used for WECS.
A
4
2
2
Compare DFIG and PMSG.
A
4
2
3
Draw the wind power versus wind speed characteristics curve.
A
4
2
4
Draw the block diagram of variable speed constant frequency
WECS.
A
4
2
5
Write down the formula for capacity factor.

……….
B
4
1
1
Deduce the equivalent circuit of induction machine.
B
4
1
2
Derive the torque equation of induction machine.
B
4
1
3
Derive the torque equation of induction machine and deduce
step by step equivalent circuit of it. Prove P2:Pm:Prot.cu.loss =
1:(1-s):s
B
4
1
4
Explain the equivalent circuit of PMSG with all of its
parameters.
B
4
2
1
Draw the block diagram of variable speed variable
frequency systems and explain the function of each block
in it.
B
4
2
2
Explain the mathematical modeling of DFIG with necessary
equations.
B
4
2
3
Explain the mathematical modeling of PMSG with necessary
equations.
B
4
2
4
Describe the features of variable speed WECS and explain
how it is advantageous than the fixed speed WECS.
………
A
5
1
1
What are the interconnection requirements for wind power
plants?
A
5
1
2
Name any two issues of grid connection.
A
5
1
3
What is LVRT?
A
5
1
4
How are wind power systems classified?
A
5
1
5
What are the major problems related to grid
interconnection?
A
5
2
1
What are the advantages of grid connected systems?
A
5
2
2
What is voltage dip and voltage swell?
A
5
2
3
Define voltage sag.
A
5
2
4
Define sub synchronous resonance SSR in power grid.
A
5
2
5
What is matrix converter?
………..
B
5
1
1
Explain LOW VOLTAGE RIDE THROUGH control strategy
of grid connected variable speed wind turbine generator
system.
B
5
1
2
Explain the choice of generators for fixed speed systems and
derive the model of synchronous generator for wind speed.
B
5
1
3
Derive the power wind speed characteristics of variable speed
systems.
B
5
1
4
Write the short notes on DFIG in variable speed systems.
B
5
2
1
Derive the modeling for variable speed generators. Also
explain variable speed and variable frequency schemes with
necessary diagrams.
B
5
2
2
What is meant by stand alone WECS system? Explain about
the issues of grid connection.
B
5
2
3
Explain in detail about (i) machine side controllers and (ii)
grid side controllers.
B
5
2
4
Explain wind energy storage systems and hybrid systems.
………..

C
3
1
Explain all methods of pitch control techniques of a wind mill.
C
3
2
Explain all types of towers used for wind mill with diagram.
List out pros and cons of each type.
C
3
3
Explain the complete operation of matrix converter used for
wind mill applications.
………..
Note :
 Name of the file should be same as subject code [for example BA5201.doc]
 Last date to submit the question bank at exam office for
 I Yr PG – 13.04.2018 (All Units)
 PART – C – Not Applicable for Mathematics Paper. For case study &
comprehensive type of questions, there will be no choice.
PRINCIPAL