power electronics in wind energy system

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In this presentation the different generators used in wind energy system is analysed and suitable converts for the generators are proposed and explained.

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POWER ELECTRONICS IN WIND ENERGY SYSTEM a paper presentation on power electronic converters in wind energy systems :

POWER ELECTRONICS IN WIND ENERGY SYSTEM a paper presentation on power electronic converters in wind energy systems By Althaf hussaisn Shaik(K L university) Nadendla. Srikanth(K L University) 1

Theme:

Theme To improve the utilization of wind energy effectively by using power electronic converters . 2

contents:

contents Introduction Wind energy conversion system Types of wind energy systems DFIG P.E converter in WEC Comparison of WEC systems Boost converter and Inverter Importance of Z-Source Converter Switching sequence MATLAB simulation model C onclusion 3

Wind Energy Conversion System :

W ind E nergy C onversion S ystem F ig: Block diagram Fixed speed wind turbines Partially Variable speed wind turbines Fully Variable speed wind turbines Electrical G enerator Wind turbine Power electronic interface Gird 4

Variable speed wind energy conversion system:

V ariable speed wind energy conversion system DFIG Transformer Wind gear external box grid partial-rating power converter Fig: variable speed wind energy conversion system G DC AC AC 5

Fully variable wind energy conversion system:

Fully variable wind energy conversion system AC-DC converter DC-AC converter DC A C G rid Gear box Syn generator DC-Link Fig: Fully-variable system 6

Why DFIG ?:

Why DFIG ? DFIG provides more operating range compared to other It provides -40% to +30% speed range. The power flows in both rotor and stator 7

Why a P.E converter is needed in wind energy conversion ?:

Why a P.E converter is needed in wind energy conversion ? The wind flows may not be fully controlled and can cause variances in the frequency at which the power is generated . Power electronic devices are utilized in these systems to convert the generated ac voltages into HVDC. Through these devices, the power delivered by these systems is cleaner and has a higher P.F . 8

Comparison of wind energy conversion systems:

Comparison of wind energy conversion systems Sno: WEC Based on Generator Grid integration 1 Fixed speed System Induction generator Direct 2 Partially variable System DFIG VSC 3 Fully-variable system Induction or synchronous VSC or ZSC 9

Wind energy conversion system:

Wind energy conversion system Fig: fully variable system 10

Boost converter + Inverter:

Boost converter + Inverter Fig: WEC system with boost converter and inverter 11

Z-source inverter:

Z-source inverter Fig: WEC system with Z-source converter 12

Single phase ZSC:

Single phase ZSC v z s a s t z s a s Fig: single phase z-source converter 13

Active state:

Active state Fig: Active state 14

Shoot through state:

Shoot through state Fig: Shoot through state 15

Switching sequence:

Switching sequence S.no S1 S2 S3 S4 STATE 1 1 1 0 0 Zero 2 1 1 0 1 Shoot through 3 1 0 1 0 Active 4 1 1 1 0 Shoot through 5 0 0 1 1 Zero 6 0 1 1 1 Shoot through 7 0 1 1 0 Active 8 1 0 1 1 Shoot through 16

4:

4 Fig: MATLAB simulation 17

Results:

Results Fig: Active and shoot through states 18

ZSI shoot through stage:

ZSI shoot through stage Fig: shoot through state 19

Conclusion::

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, minimal count, increased efficiency and reduced cost. 20

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Any queries ??? 21

PowerPoint Presentation:

Thank You 22

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