ELECTRICAL MODELING OF A THERMAL POWER STATION

• Main Author: Kaisinger, Reinhard
• Format: Others
• Language: English
• Published: KTH, Elektriska energisystem 2011
• Online Access: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-53718

Physical systems are becoming more heterogeneous. Different engineering domainsare interacting more and more. Therefore, it is desirable to have modeling tools that allow multi-domain modeling. In thermal power plants, three engineering domains are of particular relevance: a) thermodynamics, b) mechanics and c) electrical engineering. The interaction of these three domains, among a few others, allows the generation of power, power control and power conversion. The goals of this project are: a) to derive a model of a thermal power station and its responses to frequency deviations (primary control), and, b) to document how frequency control is carried out in Denmark and Germany. A model of a thermal power plant has been derived in Dymola, a multi-domain modeling and simulation software tool. Fundamental components of thermal power plants, such as generator, steam turbine and turbine governor, are united in one overall model. Hence, the derived model integrates aspects of three engineering domains and captures respective phenomena relevant for frequency control. Recorded data from Block 1 of Amagerværket in Copenhagen, Denmark, is used to verify the model. Simulation results show that the model responds appropriately to frequency deviations and changes in power set point. Model simplifications are presented and motivated, and, for further model enhancements, possible future work is given. Environmental concerns enhance the integration of renewable energy sources, such as wind and solar power, into electricity production. Wind and solar power can cause fluctuations in power generation which must be compensated by controllable generating units. Due to the large and steadily increasing share of renewable electricity generation in Denmark and Germany, frequency control is documented in these two countries. Frequency control follows different strategies in the ENTSO-ERG Continental Europe (former UCTE) and Nordic (former NORDEL) systems 1 . Load-frequency control is used in the ENTSO-E RG Continental Europe system as a centrally controlled frequency restoring action. In the future, the market for balancing reserves can be expected to be intensified.