Integration of the German Offshore Wind Power Potential into the Electricity Supply System

B. Lange, Ü. Cali, R. Jursa, F. Schlögl, M. Wolff, K. Rohrig

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Introduction

Online Monitoring and Wind Power Forecasting

Future challenges

Wind Farm Cluster Control

Conclusion

Overview

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Wind Energy in Germany (12/05)

Onshore:18300 MW17400 WEA

Offshore:0

50 % of installed capacity in Europe and 30 % world wide

Introduction

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load w/o wind

Typical load profile in Germany 1.-7. May

yesterday: conventional generation = load

Introduction

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load incl. wind

Load profile & wind generation today

today: conventional generation = load – wind generation

Introduction

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Online Monitoring and Wind Power Forecasting

Representative wind farms

(sub-stations)

E.ON: 59 sites 1912 MW

VE-T: 17 sites 499 MW

RWE: 16 sites 446 MW

Online calculation of wind generation

Numerical weather prediction (DWD)

Short- and medium-term forecast with help of artificial neural networks

Wind Power Management System

WPMS

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Wind Power Management System (WPMS) In operation at: E.ON Netz, Vattenfall Europe Transmission, RWE Transportnetz Strom, Currently implemented at: EnBW TransportnetzeBasis for horizontal exchange of wind power (EEG §14)

Online monitoring and Wind Power Forecasting

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I/Ro 1/2002

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Online Monitoring and Wind Power Forecasting

Development of forecasting error of the WPMS for one TSO

Introduction of operational forecasting decreased the need for balancing power

Improvement in forecasting similar to capacity increase

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Further growth & planned / approved offshore projects

Future Challenges

Planned offshore wind farms (2020):

North Sea (AWZ) 18.600 MWBaltic Sea (AWZ) 1.700 MW

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load incl. wind

Load profile & wind generation 2015

tomorrow: konv. generation = load – wind generation = 0 !!

Future Challenges

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Future Challenges

Requires innovative management strategies for wind turbines, wind

farms and wind farm clusters

Key issues for future grid integration in Germany

balancing

transport and congestion management

grid management

grid security

frequency control

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Wind Farm Cluster Control

Wind Farm Cluster Control

Aggregation of on- and offshore wind farms

• allows innovative control strategies

• Enables TSOs to control a large number of turbines

• Allows control of wind farms with different capabilities

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Wind Farm Cluster Control

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Wind Farm Cluster Control

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Wind Farm Cluster Control

Innovative grid management strategies

• limitation of power output

• reactive power supply and voltage control

• provision of balancing power

• generation according to schedule

• limitation of power output gradients

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Index

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23:15 01:15 03:15 05:15 07:15 09:15 11:15 13:15 15:15

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cluster

cluster new

wind farm

wind farm control

Wind Farm Cluster Control

Limitation of power output gradients

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Reserve power supply (500 MW)

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06.10.2003 07.10.2003 08.10.2003 09.10.2003 10.10.2003

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Reserve PowerReduced Power

Wind Farm Cluster Control

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Guaranteed power supply

Wind Farm Cluster Control

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09.10.2003 10.10.2003 11.10.2003 12.10.2003

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Online

Forecast

guaranteed power supply

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Conclusion

Today the main task for wind power integration is power balancing

Solution: Online monitoring and exchange Wind power forecasting

Higher penetration leads to new challanges Transport Grid management and security

Wind power needs capabilities similar to conventional power plants

=> Wind Farm Cluster Control