Performance Evaluation of a PMSG Performance Evaluation of a - - PowerPoint PPT Presentation

• Performance Evaluation of a PMSG

Performance Evaluation of a PMSG-Based Variable Speed Based Variable Speed Wind Generation System Using Maximum Power Point Wind Generation System Using Maximum Power Point Tracking Tracking

• GENERAL TOPICS

GENERAL TOPICS

Introduction Introduction Modeling four legs Power Inverter Modeling four legs Power Inverter Modeling of PMSG (Permanent Magnet Synchronous Generator) Modeling of PMSG (Permanent Magnet Synchronous Generator) Modeling Boost Converter Modeling Boost Converter Modeling of Bidirectional Converter Modeling of Bidirectional Converter MPPT (Maximum Power Point Tracking) Algorithm MPPT (Maximum Power Point Tracking) Algorithm Simulation Results Simulation Results Conclusion Conclusion

• The modeling technique is proposed and uses sinusoidal positive sequence
• f the load current to avoid high pass filter used to extract the current

harmonics ;

• The PMSG is used to generate power to be send to the battery or to the grid.
• The MPPT is proposed which uses a wind turbine model to extract the

maximum power from the wind turbine;

• The Bidirectional converter is added to the system to charge the electrical

vehicle battery or to send the power to the load in case of very low wind speed or to send the power to the grid in case to reduce the peak consummation of the network;

• The THD of the grid current for different operations is less than 5%, also,

the inverter compensates

• mpensates efficacy

efficacy the the reactive reactive and and the the unbalance unbalance load load.

INTRODUCTION

• System configuration

Ω

S

B

L

2

L

2

C

S

L

I

• CONVERTS

MECHANICAL POWER TO THE ELECTRICAL POWER

• INVERTER MODELING

The control laws are

= − + − + = + − − + = + − − + + = + + −

s d L d c c c L q c s q d d c d s q L q c c c L d c s d q d c q s n L n c c c n d c n c d c d c d c d c d q c q n d c

d i d i L L L i L i d v v d t d t d i d i L L L i L i d v v d t d t d i d i L L L v ( d 3 d ) v d t d t 3 L L d v v 3 3 1 C d i d i ( d 3 d ) i d t R 2 2 3 ω ω ω ω

− + − + + = − + + − + =   − − +     = +

Ld d c c Lq c sq d d dc Lq q c c Ld c sd q q dc Ln n c n c n dc c

di u L L i L i v dt d v di u L L i L i v dt d v di u v L (3L L ) d dt d 3v L 3 ω ω ω ω

• sin θ

2 sin( ) 3 π θ −

4 s in ( ) 3 π θ −

• !

Load currents

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• &

' ()

• *
• +

• PMSG MODELING

q d d d r q d d d q q d r m q r d q q q q r m e r

L di v R i i dt L L L di v L R i i dt L L L L d J T T B dt = − + − = − − + − = − − ω ω φ ω ω ω

( )

3 2 3

1 3 2 2 2 = − − = − −

r m e r p r m q r

d r P J T T B sC i B dt ω ω ρ ω φ ω λ

The dynamic equation of the PMSG is given by:

( )

3 2 * 3

4 1 3 2   = −    

q p r s m

r i s C u P ρ ω φ λ The reference current on the q-axis is given by: The PMSG modeling in dq frame is given by:

i

v

=

I i

d

i

u

1

LB

i

dc

v

* r

ω

r

ω

s

u

,

1 − = +

i i dc

u v d v

• * )*"

# . // //

• )$)'%
• *

* =

V R λ ω

The parameters Cpmax and λ* are determined using the model of the wind turbine given in the figure below.

1 0.035 0.08 1 1 2 3 4 6 3

1 0.035 ( , ) 0.08 1

  −   + +  

= − −           − + + +  

p

C c c c c e c

λ β β

λ β β λ β β λ

* m

T

max p

C

β v

3 * _ max max *

1 . . 2   =    

mec P

R P C S ω ρ λ

_ max * *

=

mec

mec

P T ω

* * = V

R λ ω

*

λ

)

• #
• λ0

, 1 ) ( . ) ( 2 , λ0 β3&

• Modeling and Control of Battery Charger

dc

v

bat

v

L 2

I

2+,2+,

• ,-2+,2+,
• 4

!/ 4

• SIMULATION RESULTS

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* &$)&&! ' ++))"' ++,

• POWER FLOW OF THE SYSTEM

CHARACTERISTICS OF THE BATTERY

• +5)*"

$%

• CONCLUSION
• The PMSG has been found capable to work under varying wind

conditions and the MPPT tracks the maximum power point;

• The proposed control for the grid-side inverter show the capacity to

compensate harmonics, reactive power and unbalance as well as to inject generated power into the grid and/or the battery;

• The bidirectional DC-DC chopper is able to charge a battery for

electrical vehicle or to send an energy from the battery to the grid in case of emergency or to supply others loads;

• The MPPT technique used track the maximum power generated by

the wind turbine.

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