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Seminar

The Role of Intrinsic Mechanisms for Power System Stability

Friday, 12 July 2019, 11:00-12:30
Campus Nord, Institut für Automation und Angewandte Informatik, Geb. 449, Raum 140

One of the fundamental control challenges in power systems of whatever size is balancing generation and demand while respecting all constraints of the elements of the system. From a control perspective, the power market and related unit commitment optimization may be considered as a feedforward control for balancing, based on forecasts of consumption and renewable generation. The market acts at a sampling time of, one hour (international markets), 15 minutes (German market) down to five minutes (Australian market) and with a gate closure time of at least a few minutes up to one hour. To cope with disturbances, such as power plant outages or forecast errors, a closed loop balancing control is needed. As is well known, frequency is an indicator for system imbalance. Hence, real time balancing is performed by so called load frequency control (LFC) loops, such as Frequency Containment Reserve (FCR, also known as primary control) and automatic Frequency Restoration Reserve (aFRR, also known as secondary control). These balancing mechanisms have, despite their simplicity, shown remarkable performance and reliability for very large interconnected power systems as in continental Europe.

However, neither current LFC, nor any other balancing control paradigm, can be arbitrarily fast, since measurement, communication, the execution of the control algorithm, and, in particular, the realization of its result (change in power of generators) need time. For this reason, intrinsic properties of generators and consumers are important for active balancing to be feasible and, thus, for system stability. Among those intrinsic properties are the inertia of generation and load dynamics. This talk provides an overview and highlights their importance. The impact of changes in these properties on the dynamic behaviour and the stability of the power system is shown. Finally, some possible solutions will be presented and discussed.

Speaker
Prof. Dr. Hendrik Lens

Universität Stuttgart
Institut für Feuerungs- und Kraftwerkstechnik (IFK)
Organizer
Sekretariat
IAI
KIT
Karlsruhe
Mail: sekretariat does-not-exist.kit edu
https://www.iai.kit.edu
Targetgroup
Interested / Everyone
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