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Wednesday, 12 March 2014
16:30 - 18:00 Storage & grid integration
Hardware Technology  

Room: Tramuntana
Session description

As wind energy becomes an increasingly important power supply technology in many countries, the wind energy sector has to keep on working in collaboration with system operators and develop the technological solutions that are required. This session will present new developments that will consolidate wind energy as a major element of electricity systems: wind turbine group (WTG) hardware and software, new control strategies from WTG to global power systems as well as storage solutions.

Learning objectives

  • Identify new WTG capabilities for grid operation support
  • Analyse new control strategies at both WTG and wind farm level
  • Understand how wind energy will/can be managed in future scenarios and at high penetrations
  • Examine what is at stake to consolidate wind energy as the future leading energy source
  • Identify and analyse electricity storage business models
Lead Session Chair:
Luis Polo, AEE, Spain

Santiago Arnaltes, University Carlos III of Madrid - UC3M, Spain
Rajni Burra GE Power & Water, United States
Rajni Burra (1) F P
(1) GE Power & Water, Schenectady, United States

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Presenter's biography

Biographies are supplied directly by presenters at EWEA 2014 and are published here unedited

Rajni K. Burra (M’10) received the B.Tech. degree
in electronics and communication engineering from
the Indian Institute of Technology, Kharagpur, India,
in 2000 and the M.S. and Ph.D. degrees in electrical
engineering from the University of Illinois at
Chicago, Chicago, in 2003 and 2006, respectively.
He is currently the Product Manager of Grid Integration at GE Power and Water. Hehas published over 13 refereed international journals and conference papers. His research interests include nonconventional and renewable energy systems, active power filtering, and power semiconductor devices.


Grid performance - GE brilliant turbines


Wind power forecasting and dispatch over sub-hour intervals is a new norm on various ISOs. In order to ensure system stability, curtailments and regulation charges are enforced, when the wind power falls out of the tolerance bands. With NERC planning to propose smaller dead band for governor/frequency-droop response (example +/-36 mHz in ERCOT), more frequent short term curtailment would result in revenue loss and more fatigue accumulation on the pitch system. Similarly, there have been significant changes in how wind plants get dispatched in Europe and rest of the world and have curtailment/revenue loss implications.


GE Brilliant turbine, with cost-effective integrated storage was introduced to the wind industry in early in 2013. Turbine integrated storage and plant controls enabled three initial applications:
• Predictable Power: Firm plant output enabled by advanced plant level forecasting and storage dispatch
• Frequency Regulation: Ancillary service participation and additional revenue making opportunity
• Ramp control: Capturing curtailed energy during fast ramps
Each of these applications was selected to address problems associated with evolving market rules and enable superior grid performance.

Main body of abstract

• Predictable Power: Hybrid wind turbines are equipped with a finite amount of storage, integrated plant control architecture and advanced forecasting algorithms, which provide substantial improvements in plant power predictions up to 1 hr. GE conducted experiments for a 15 min time window showed > 75% reduction in plant level variability. This would significantly reduce the need for grid reserves especially in balancing areas and utilities with high penetration and inflexible generation.
• Frequency Response and Active Power Controls: The hybrid wind plant has the ability to provide superior inertial, primary and secondary frequency response behavior when compared to any existing generator. The wind plant can respond to both under frequency and over frequency without the need to spill any energy. In addition, it can participate in ancillary service markets like the frequency regulation market and get paid additionally. The new FERC 755 order which incentivizes payment for performance could make this lucrative.
• Improved grid disturbance rejection behavior: A wind farm experiences a variety of grid disturbances primarily due to changing grid impedance or the short circuit ratio over time. As a result the wind turbine electrical controls have significantly low bandwidths to reject the grid disturbance and resonant modes and have to be tuned over time to prevent trips and increased downtime. This technology enhances the bandwidth of electrical controls and improves the active damping capability for multiple grid and turbine resonant modes.


GE will demonstrate operation of 3 storage integrated turbines at Texas by the end of this year. The final paper will present field results of the Texas turbines and quantify the performance benefits. Additional simulation results showing improved grid performance and loads reduction benefits will be presented and impact on wind plant operation costs will be shared. The presented results will be compared with the current technology and will show the hybrid turbine technology relevance to the US and global wind markets.

Learning objectives
Learning Objectives:
• The audience will get an understanding of the key ideas, benefits, and limitations of the different applications of hybrid wind plant technology.
• The audience will learn how the design parameters and trade off of the various energy storage systems influence the performance of the hybrid turbine technology.
• Researchers in academia will get an industrial perspective on the introductory research topic of hybrid wind turbine and controls.