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Presented at POWER-GEN Europe, Amsterdam, June 2015
The integration of renewable energy sources with preferred feed in the high voltage transmission system results in fundamental changes in the global and local load regime of the European transmission grid. The turbine generator as the key electrical component of the plant will face new operational stresses created by the more flexible grid behavior. The correlation between individual grid code requirements, extrapolated mechanical utilization stresses and affected generator components is demonstrated with examples.Possible mitigations and solutions are presented for generators which have been in service for many years and are now confronted with the new grid demands.
Presented at VGB-Kraftwerke-Congress, Vienna, September 2015
The new flexible grid demand has an impact on the whole system “generator” with different amount of wear and aging at individual components. This presentation evaluates current operation regimes and describes the therefor extended requirements on turbo-generators: fast active & reactive load changes, load ramps, under-excitation and over-voltage. Possible solutions and mitigations are presented.
Presented at 47th Kraftwerkskolloqium, Dresden, October 2015 (German language)
Three-pole grid short circuits with error clarification times longer than 150 ms must not lead to power plant’s instability in accordance to the Transmission Code 2007 depending on local grid codes. The generator stability is influenced by a variety of parameters in case of grid short circuits near the power plant. This Paper explains the influence of the instrumentation & control system and the turbine control valves on the turbine performance and hence on the critical error clarification time.
Presented at 19th International Symposium on High Voltage Engineering, Pilsen, Czech Republic, August 2015
In terms of future development and improvement of efficient insulation systems with a higher output to volume ratio of large turbo generators adequate tools and techniques are necessary for dimensioning the electrical field grading system in a time and cost saving manner. This paper introduces highly specialized FEM models which allow calculations of extensively structured outer corona protections (OPC) systems. Especially the results of investigations of electrical parameters (i.e. potential, field distribution, resistive losses) depending on varying OCP resistivity are discussed.