Development of an innovative Wind Energy Cluster Concept

1

Frank Richert

Organisation

21.07.2014 2

Development of

wind power plants

Condition monitoring

wind power plants

Service on

wind power plants

Gesellschaft für Energie und Ökologie mbh

o Project development windenergy

national/international/On- and Offshore

o Technical operation

BZEE Academy GmbHTeaching of service technicians

National / International

2

Aim of the Company

21.07.2014 Confidential © SkyWind GmbH

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• Development of Renewable Power Plants (RPP)

consists out of several Wind Energy Converter

(WEC) from view of an operator

• Design, assembly and operation of WEC prototypes,

in house system understanding

• Assist serial production of WEC

• Licensing

RPP Development

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4

• 3.4 MW WEC also usable for difficult to access sides

• Universal platform for different drive train concepts

• Grouping of single WEC to power plants (RPP)

• Minimization of Cost of Energy

Target

• System simplification through WEC clustering

• Avoid external cranes for installation and maintenance

• Optimization of size and mass of components

• Simplification of service and maintenance

Strategy

Windpower State of the Art

5

Wind farm

bus bar

Converter 2

Converter 1

Trafo 2

Trafo 1 Switch1

Switch2

Trafo

Grid

Switch

WEC 2

WEC 1

New approach

6

WEA 2

WEA 1

Schalter 2

HS-Trafo

Netz

Schalter

Schalter 1

Frequenzumrichter

Cluster

Sammelscheine

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Cluster of WECs Cluster power unit

grid unit grid

RPP

Renewable

Power Plant

Wind Cluster DesignPros.:

• WT simplification, less parts (or

easy redundancy possible)

• Clear(er) interface between grid

and WT operators

• Less COE

Cons.:

• Potential power loss?

• Higher WT loads

Advanced control strategy for

load, power and frequenzy control

needed

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Reactive power generation (converter or/and capacitors)

Active and reactive power control

Dynamic behavior of the system especially during

synchronization of additional generators

Converter current limitation during synchronization of

additional generators

Best overall control strategy

(some) Issues to solve

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Cluster Control Strategy

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WEC 1

WEC 2

Pist

f soll

f ist

-

+

U,f

Power curve

Converter

Controler

Regulate on fixed power curve

Cluster Control Strategy

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WEC 1

WEC 2

Pist

f soll

f ist

-

+

U,f

Converter

ControlerMPPT

MPP Algorithmus

Find Maximum Power Point

Cluster Simulation Model

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Example: synchronization of WECs at different stages

Semi-scale Test Bench at University Kiel

Mechanical Part of WECs Electrical Part of WECs

iS, f

S

AsynchronmaschinePr fling Generator 1ü

w,ma

mw

3

~

3 ~

AsynchronmaschineLast

iS, f

S

AsynchronmaschinePr fling Generator 2ü

w,ma

mw

3~

3 ~

AsynchronmaschineLast

Frequenzumrichter

Frequenzumrichter

Frei programmierbarerFrequenzumrichter

Schalter

Netz

~

13

Converter

Converter

Converter

60 kW Asynchron

Motor

Asynchron

Motor

Grid

Asynchron

Generator 1

Asynchron

Generator 2

Free

programmable

110 kV converterSwitch

Test at University Kiel

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15

3.4 MW WEC

2-blade 107 m rotordiameter

138 m hub height (hybrid tower)

3 kV compact medium speed drivetrain

(Gearbox/Asynchronous G)

Modular concept for easy exchange of

components

Dual control and measuring system

Craneless (de-)installation

Full scale test “WETEC”WindEnergyTEchnologyCarrier

Split up in turbine and tower/crane

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17

Status: Successful test of

lifting systemdrivetrainblades

18

View from turbine

8.5 MV grid

connection unit

Start of operation

August 2014

Vorwerksallee / Vorwerk 5

24782 Büdelsdorf /Germany

GmbH

www.skywind.de mailto@skywind.de +49 4331 436 22 -0

Thank you for your attention