Integrating Wind Energy Capabilities of Wind Power Plants Mark Ahlstrom Wind Energy: A Good Citizen of the Electric Grid Four Corners Wind Resource Center.

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Presentation transcript:

Integrating Wind Energy Capabilities of Wind Power Plants Mark Ahlstrom Wind Energy: A Good Citizen of the Electric Grid Four Corners Wind Resource Center Webinar December 14, 2015

2 Background WindLogics –Computing, meteorology and applied math folks –Forecasting & optimization solutions that enable low cost, reliable & sustainable power systems –Subsidiary of NextEra Energy Resources since 2006 NextEra Energy (NYSE: NEE) –NextEra Energy Resources Largest generator of wind and solar energy in North America –Florida Power & Light (FPL) Large rate-regulated electric utility (4.7 million accounts)

3 All Generators Have Personalities Reflect characteristics of fuel and technology Conventional thermal generators –Start-up times & costs –Minimum run times –Operating ranges –Ramp rate limitations Wind generators –Variability –Forecasting / scheduling The challenge with wind energy is a bit different, but not totally unique

4 Coordinating: Every Day, Every Five Minutes Unit commitment coordinates the coming hours and day Dispatch coordinates in real time (often every five minutes) Dispatch is not arbitrarily telling a generator what to produce… It is knowing what is available for the dispatch period and optimizing the system as a whole

5 Most Wind in North America is Dispatched Today Most ISO/RTO systems (market regions) now include wind in unit commitment and dispatch Wind dispatch with a 10-minute-ahead forecast or faster –Using the current telemetered value (“persistence” forecast) –Using a rolling five-minute forecast (“persistence + model” forecast) Doesn’t need an ISO - this works anywhere –Forecast wind into the day-ahead plan –Dispatch the entire system (including wind) every few minutes using a very short term wind forecast or the current output value

Best Operating Practices for Integrating Variable Generation Recommendations of numerous studies 1 1.Shorter scheduling intervals 2.Larger balancing areas 3.Better use of flexibility from the entire power system 2 4.Integrate wind and solar forecasts into tools and markets 5.Review causes and incentives that lead to system inflexibility… many are not physical in nature 1.See 2.Integration studies have not shown that storage is needed to integrate wind, nor have the benefits of storage been sufficient to justify building new storage... at least not yet! 6

7 More than Energy - Reliability Services In addition to operating under normal circumstances, system operators must deal with disturbances Frequency support –Deviations can result in damage to equipment or loss of load –Must restore frequency after a disturbance Voltage control –Local voltage control - normal operations and disturbances –Reactive power is needed to keep electricity flowing and maintain normal voltage levels Ride through frequency and voltage events –Remain online and available to help the system

8 Example: Frequency Response to an “Event” Initial disturbance (e.g., the loss large generating unit) Instantaneous (“inertial”) response from some resources and very fast response from other resources to slow the rate of fall Additional power to compensate for lost resources and bring system frequency back to normal Fast increase in power output to stabilize the frequency

9 Capabilities of Wind Plants Dynamic reactive power has been available for years –Standard feature of most wind turbines for over 8 years –Already provided by almost all utility-scale wind plants Frequency response is an available option –ERCOT (Texas) requires frequency response from wind “Synthetic inertia” is an available option –Hydro Quebec requires inertial response from wind –Uses wind turbine’s kinetic energy for very rapid power injection These options do have additional costs –Rules should reflect the economics and characteristics of fuel types and technologies

10 Wind Plants are Power Plants Dispatchable –Easy if done right, high errors if “fuel characteristics” are ignored Ride through disturbances –Wind ride-through requirements exceed conventional generators Provide frequency response and voltage control –Implemented for wind in Texas and other regions Impressive ramping and active power control –Very fast and accurate response over entire capability range

Global expertise for wind and solar operations and integration The leading experts collaborating on today’s critical issues Utilities, RTOs, OEMs, operators, planners, project developers, researchers, forecasting experts, market designers and more Technically-grounded information and education without lobbying, selling or advocating Spring Annual Meeting - April in Sacramento, CA O&M User Group Meeting - April 6-8 in Des Moines, IA UVIG

Discussion Mark Ahlstrom