Methods To Assess The Rate Of Change Of Frequency Withstand Capability Of Large Power Plants

Methods to Assess the Rate of Change of Frequency Withstand Capability of Large Power Plants PDF
Author: Alf Assenkamp
Publisher: Cuvillier Verlag
ISBN: 3736960875
Size: 17.88 MB
Format: PDF
Category : Technology & Engineering
Languages : en
Pages : 172
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Schwere Fehler in elektrischen Netzen mit einem hohen Anteil an umrichtergestützter Einspeisung, z.B. aus Windparks und Photovoltaikanlagen, führen ohne zusätzliche Netzstützungsmaßnahmen zu erhöhten Frequenzänderungsraten (ROCOF). Folglich erhöhen Übertragungsnetzbetreiber ROCOF-Werte, denen die Generatoren standhalten müssen. Dies ist aus Sicht der Systemstabilität wichtig, stellt aber eine große Herausforderung für Synchronmaschinen dar. Bislang wurden hauptsächlich Fehler wie Fehlsynchronisierungen oder klemmennahe Kurzschlüsse bei konstanter Netzfrequenz für die Auslegung großer Synchronmaschinen betrachtet. Das Problem ist, dass es entsprechend noch keine Methoden zur zuverlässigen und reproduzierbaren Beurteilung der Widerstandsfähigkeit von Synchronmaschinen gegenüber hohen Frequenzänderungsraten gibt. Im Rahmen dieser Arbeit werden daher Methodiken entwickelt für den Aufbau der Netzmodelle für ROCOF-Studien, für die Untersuchung der Fähigkeit von Synchrongeneratoren, bei Ereignissen mit hohen ROCOF-Raten mit dem Netz synchronisiert zu bleiben, und für die Untersuchung der mechanischen ROCOF-Widerstandsfähigkeit von Synchronmaschinen. Die Methodiken werden anhand von Beispielstudien validiert und anschaulich dargestellt. Severe faults in electrical networks with a high proportion of inverter-supported feed-in, e.g. from wind farms and photovoltaic systems, lead to increased rates of change of frequency (ROCOF), if no additional frequency support measures are installed. As a result, transmission system operators increase ROCOF values that the generators must withstand. This is important from the point of view of system stability, but represents a major challenge for synchronous machines. So far, faults such as fault synchronisation or short circuits close to the terminals at a constant mains frequency have mainly been considered for the design of large synchronous machines. The problem is that, accordingly, there are still no methods for reliable and reproducible assessment of the resistance of synchronous machines to high ROCOF. In the context of this work, methodologies are therefore developed for setting up power system models for ROCOF studies, for the investigation of the ability of synchronous generators to remain synchronized with the network during events with high ROCOF rates, and for the investigation of the mechanical ROCOF withstand capability of synchronous machines. The methodologies are validated and illustrated by means of sample studies.

Backpacker

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Pages : 140
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Backpacker brings the outdoors straight to the reader's doorstep, inspiring and enabling them to go more places and enjoy nature more often. The authority on active adventure, Backpacker is the world's first GPS-enabled magazine, and the only magazine whose editors personally test the hiking trails, camping gear, and survival tips they publish. Backpacker's Editors' Choice Awards, an industry honor recognizing design, feature and product innovation, has become the gold standard against which all other outdoor-industry awards are measured.

Bulletin Of The Atomic Scientists

Bulletin of the Atomic Scientists PDF
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Pages : 56
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The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.

News Releases

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Category : Nuclear energy
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Popular Science

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Popular Science gives our readers the information and tools to improve their technology and their world. The core belief that Popular Science and our readers share: The future is going to be better, and science and technology are the driving forces that will help make it better.

Bulletin Of The Atomic Scientists

Bulletin of the Atomic Scientists PDF
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Pages : 56
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The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.

Final Environmental Statement

Final Environmental Statement PDF
Author: United States. Bureau of Land Management
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Bulletin Of The Atomic Scientists

Bulletin of the Atomic Scientists PDF
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Size: 30.65 MB
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Pages : 56
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The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.

Bulletin Of The Atomic Scientists

Bulletin of the Atomic Scientists PDF
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Size: 25.21 MB
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Pages : 48
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The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.

Bulletin Of The Atomic Scientists

Bulletin of the Atomic Scientists PDF
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Size: 25.25 MB
Format: PDF, ePub, Docs
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Languages : en
Pages : 48
View: 5635

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The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.