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# model wecs

publicité ```Subcode
Subject
Name
Sem
Degree
PX5071
WIND ENERGY CONVERSION SYSTEMS
III
M.E. POWER ELECTRONICS &amp; DRIVES,
M.E.POWER SYSTEMS
EEE
V.BALASUBRAMANIAN
Branch
Staff
Name
Date of
Updation
Part
Unit
Group
A
A
A
A
A
1
1
1
1
1
A
A
17:9:18
Question
1
1
1
1
1
Q.
No
1
2
3
4
5
1
1
2
2
1
2
List out advantages and limitations of WECS.
What are the importance of TSR while designing a wind
turbine?
A
A
1
1
2
2
3
4
What is Betz limit?
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.
Differentiate BETZ and SABININ’S theory.
What is nacelle?
What is the use of wind vane in the wind turbine?
What is swept area of wind turbine?
Compare HAWT and VAWT.
List out various wind energy conversion schemes.
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
A
2
2
1
1
1
2
…………..
Define thrust force, angle of attack.
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
A
2
2
5
Draw the different blade profile for the different TSR.
1
……….
Explain the step by step procedure for designing the blade of a
B
2
1
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
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
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
A
A
A
A
A
A
A
A
4
4
4
4
4
4
4
4
4
1
1
1
1
1
2
2
2
2
1
2
3
4
5
1
2
3
4
A
4
2
5
………..
What are the features of variable speed WECS?
Compare fixed speed WECS and variable speed WECS.
What is the need for variable speed WECS?
What are the pros and cons of variable speed WECS?
List out features of DFIG used for WECS.
List out the features of PMSG used for WECS.
Compare DFIG and PMSG.
Draw the wind power versus wind speed characteristics curve.
Draw the block diagram of variable speed constant frequency
WECS.
Write down the formula for capacity factor.
B
B
4
4
1
1
1
2
B
4
1
3
B
4
1
4
B
4
2
1
B
4
2
2
……….
Deduce the equivalent circuit of induction machine.
Derive the torque equation of induction machine.
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
Explain the equivalent circuit of PMSG with all of its
parameters.
Draw the block diagram of variable speed variable
frequency systems and explain the function of each block
in it.
Explain the mathematical modeling of DFIG with necessary
equations.
B
4
2
3
B
4
2
4
A
5
1
1
A
A
A
A
5
5
5
5
1
1
1
1
2
3
4
5
A
A
A
A
A
5
5
5
5
5
2
2
2
2
2
1
2
3
4
5
B
5
1
1
B
5
1
2
B
5
1
3
B
B
5
5
1
2
4
1
B
5
2
2
B
5
2
3
B
5
2
4
Explain the mathematical modeling of PMSG with necessary
equations.
Describe the features of variable speed WECS and explain
how it is advantageous than the fixed speed WECS.
………
What are the interconnection requirements for wind power
plants?
Name any two issues of grid connection.
What is LVRT?
How are wind power systems classified?
What are the major problems related to grid
interconnection?
What are the advantages of grid connected systems?
What is voltage dip and voltage swell?
Define voltage sag.
Define sub synchronous resonance SSR in power grid.
What is matrix converter?
………..
Explain LOW VOLTAGE RIDE THROUGH control strategy
of grid connected variable speed wind turbine generator
system.
Explain the choice of generators for fixed speed systems and
derive the model of synchronous generator for wind speed.
Derive the power wind speed characteristics of variable speed
systems.
Write the short notes on DFIG in variable speed systems.
Derive the modeling for variable speed generators. Also
explain variable speed and variable frequency schemes with
necessary diagrams.
What is meant by stand alone WECS system? Explain about
the issues of grid connection.
Explain in detail about (i) machine side controllers and (ii)
grid side controllers.
Explain wind energy storage systems and hybrid systems.
………..
C
C
3
3
1
2
C
3
3
Explain all methods of pitch control techniques of a wind mill.
Explain all types of towers used for wind mill with diagram.
List out pros and cons of each type.
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 &amp;
comprehensive type of questions, there will be no choice.
PRINCIPAL
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