Joachim Bertsch
University of Cologne
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Featured researches published by Joachim Bertsch.
2002 IEEE Power Engineering Society Winter Meeting. Conference Proceedings (Cat. No.02CH37309) | 2002
Christian Rehtanz; Joachim Bertsch
When a major power system disturbance occurs, protection and control systems have to limit the impact, stop the degradation and restore the system to a normal state by appropriate remedial actions. Wide area measurement and protection systems limit the severity of disturbances by early recognition as well as proposition and execution of coordinated stabilizing actions. These systems complement classical protection and SCADA/EMS applications. This paper proposes a system design based on phasor measurement units, encouraging system protection schemes for frequency, small signal angle and voltage instability. The system is compared to classical protection and SCADA/EMS systems showing its benefits. A new algorithm for long-term voltage stability prediction is introduced using the proposed system setup.
IFAC Proceedings Volumes | 2003
Mats Larsson; Christian Rehtanz; Joachim Bertsch
Abstract Transmission corridors between interconnected power systems or within countrywide transmission systemsare limiting network performance or even market activities. We describe a state-of-the-art wide-area measurementsystem which is commercially available, and a new method to assess the voltage stability of a transmission corridor. Using only topological information, several lines can be grouped into a so-called virtual transmission corridor, whose parameters can be calculated from wide-area measurements. A simple computational procedure for stability analysis, makes it possible to provide approximate stability margins with an update rate of less than asecond.
ieee powertech conference | 2003
Mats Larsson; Christian Rehtanz; Joachim Bertsch
Transmission corridors between interconnected power systems or within countrywide transmission systems are limiting network performance or even market activities. We describe a state-of-the-art wide-area measurement system which is commercially available, and a new method to assess the voltage stability of a transmission corridor. Using only topological information, several lines can be grouped into a so-called virtual transmission corridor, whose parameters can be calculated from wide-area measurements. A simple computational procedure for stability analysis makes it possible to provide approximate stability margins with an update rate of less than a second. Such stability margins can be the basis for on-line dynamic rating of lines. Business cases for such dynamic rating are also discussed.
ieee powertech conference | 2001
Christian Rehtanz; Joachim Bertsch
As a result of recent developments in power markets, power utilities are forced to increase the reliability and profitability of their power systems. Their networks have to be operated closer to limits, which may lead to frequent outages due to unreliable assessment of stability limits. A new wide area protection system is introduced to extend the system operational limits, i.e. operate the system closer to the physical limits, without any investments in high voltage equipment. The system protects the entire power system against blackouts due to several kinds of instabilities. With dynamic supervision of the systems stability and the optimization of transmission capability, it is a cost-effective system that complements installed protection and control systems. Phasor measurement information is transmitted to a system protection center, where snapshots of the transient system status are online available. This dynamic systems view opens up new applications to assess and actively remain systems stability in case of voltage or angle instability and oscillations. After the introduction of the system setup of the new wide area protection system, a new voltage stability prediction algorithm for transient system states and cascaded contingencies is presented. The applicability of the algorithm is shown with the example of a test system and a real power system.
ieee international conference on probabilistic methods applied to power systems | 2016
Marie-Louise Kloubert; Johannes Schwippe; Joachim Bertsch; Simeon Hagspiel; Stefan Lorenzcik; Felix Höffler; Christian Rehtanz
Joint control reserve procurement and activation by several Transmission System Operators can have significant technical and economic benefits. In congested transmission networks, however, the activation of control reserve can be constrained by impending overloads. In this paper the benefits of an optimization to coordinate control reserve activation and grid management considering uncertainties caused by forecast errors is outlined. The effect of these uncertainties are measured by using probabilistic load flow methods based on convolution technique. A joint optimization is presented to minimize the costs of supplying control reserve and conducting redispatch, taking into account HVDC lines, variable costs of power plants and the impact of control reserve activation on lines instead of optimizing it separately as it is the current proceeding by European Transmission System Operators. In addition, a method to determine the solution space for permissible control reserve distributions is presented. In a case study of the German transmission grid for the year 2024 the costs of the joint optimization are contrasted to the costs using the normal merit order and additional redispatch as it is the current market scheme. With the simulation for one year, the solution spaces are calculated to show, which power plants can supply control reserve in every hour without causing redispatch measures and whether the existing power plants in 2024 are sufficient to provide control reserve activation without impending overloads.
Archive | 2002
Christian Rehtanz; Valentin Bürgler; Joachim Bertsch
Archive | 2007
Joachim Bertsch; Andreas Suranyi; Engelbert Jaggy
Journal of Regulatory Economics | 2016
Joachim Bertsch; Simeon Hagspiel; Lisa Just
Energy Procedia | 2013
Sean McCoy; Joachim Bertsch; Christian Growitsch; Stefan Lorenczik; Stephan Nagl; Dennis Volk; Matthias Finkenrath; John Davison
Archive | 2008
Christian Rehtanz; Andreas Suranyi; Joachim Bertsch; Marek Zima