PREPARED BY…

UPADHYAY RAKSHITA R.

ROLL NO : 18

CONTENTS… Introduction

Wind energy conversion system

Types of wind energy systems

Paper 1

Paper 2

References

Conclusion

INTRODUCTION To improve the utilization of wind energy effectively by using

power electronic converters.

Keypoints for wind energy systems are

1. Available wind energy

2. Type of wind turbine employed

3. Type of electric generator and power

4. Electronic circuitry employed

5. Interfacing with the grid

WIND ENERGY CONVERSION SYSTEM

ElectricalGenerator

Wind turbine

Power electronic interface

Gird

variable speed voltage , frequency,

operation for optimal active and reactive power

power excitation control

TYPES OF WIND ENERGY SYSTEM

WEC BASED ON GENERATOR

GRID INTEGRATION KEY POINTS

Fixed speed system

Induction generator

Direct Constant speed,Low control

ability

Partially variablespeed system

DFIG AC-DC –AC voltage sourceconverter

Highly controllable,Vector control of Active & reactive power

Fully variable System

Inductiongenerator

or sychroniousgenerator

AC-DC –AC voltage sourceconverter

or Z source

converter

Highly controllable, wide range of speed,For Z sourceShort circuit protection improved

Z - source inverter

PAPER 1 : F. Blaabjerg, Z. Chen, R. Teodorescu, F. Iov ” Powerelectronics in wind turbine system”, IPEMC 2006

Fig : control of wind turbine with DFIG system

Fig : Basic control of active & reactive power in wind turbine for DFIG system

PAPER 2 : yogesh n. murthy, “a review on power electronics applications on wind turbines”, IJRET , vol 2 , nov 2013

Maximum power point tracking algorithm

Maximum wind power control

• Generated power (P) = ½*ρ*π*(R^2)*(V^3)*Cp*λ

Methods :

• TCR control

• PSF control

Fig : Output power of a wind turbine as a function of the wind speed

Fig : TCR control Fig : PSF control

CONCLUSION.. By using both DFIG and ZSI in wind energy systems we

can get more efficiency and control over the active and reactive powers. The proposed system has high performance, increased efficiency and reduced cost.

REFERENCES

F. Blaabjerg, Z. Chen, R. Teodorescu, F. Iov ” Powerelectronics in wind turbine system”, IPEMC 2006

yogesh n. murthy, “a review on power electronics applications on wind turbines”, IJRET , vol 2 , nov 2013

Veda Prakash Galigekere and Marian K. Kazimierczuk “role of power electronics for renewable energy system”, Wright State University

Frede Blaabjerg, Florin lov, Remus Teodorescu, Zhe Chen “Power Electronics in Renewable Energy Systems”, EPE-PEMC 2006