SIMULATION STUDY OF TECHNICAL ANCILLARY SERVICES IN ELECTRICITY DISTRIBUTION SYSTEMS
Aflecht, Samuli (2018)
Kuvaus
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Tiivistelmä
This thesis was done as part of the research project DeCAS. The EU-funded project aims to analyze technical ancillary services crossing traditional boundaries from high voltage, medium voltage to low voltage, also with regard to their respective market integration concepts. The goal is to achieve an active control concept of the future distribution network where the unnecessary reactive power flows are avoided.
The studied network is located in Sundom, Vaasa. Sundom Smart Grid is a living laboratory done in collaboration with ABB, Vaasan Sähkö, Elisa and the University of Vaasa. The main target of this thesis was to examine by PSCAD simulations the addition of distributed generation and to manage the possible network interactions by the means of active network management.
An existing simulation model of the SSG was utilized. Some simplifications were made to the model to reduce the simulation time. The simulations consisted of 72 simulation cases, 36 cases with both Fingrid and ENTSO-E reactive power windows. The idea was to start from a basic model without DER-units connected and then make additions of wind turbines, photovoltaics and utilize different control scenarios for them.
The results offer information on possible interactions between different voltage levels. DER-units have capabilities for providing the ancillary services. By using ANM to control the flexibilities the amount of distributed generation can be increased significantly in an electricity network. Aggregating will be needed to sum up the smaller production portions and to ease up the marketing process. Also a type of ‘flexible database’ will be needed for the overall coordination of available resources. The database could include real time information about the free production capacities, sizes, distances, scheduling etc.
The studied network is located in Sundom, Vaasa. Sundom Smart Grid is a living laboratory done in collaboration with ABB, Vaasan Sähkö, Elisa and the University of Vaasa. The main target of this thesis was to examine by PSCAD simulations the addition of distributed generation and to manage the possible network interactions by the means of active network management.
An existing simulation model of the SSG was utilized. Some simplifications were made to the model to reduce the simulation time. The simulations consisted of 72 simulation cases, 36 cases with both Fingrid and ENTSO-E reactive power windows. The idea was to start from a basic model without DER-units connected and then make additions of wind turbines, photovoltaics and utilize different control scenarios for them.
The results offer information on possible interactions between different voltage levels. DER-units have capabilities for providing the ancillary services. By using ANM to control the flexibilities the amount of distributed generation can be increased significantly in an electricity network. Aggregating will be needed to sum up the smaller production portions and to ease up the marketing process. Also a type of ‘flexible database’ will be needed for the overall coordination of available resources. The database could include real time information about the free production capacities, sizes, distances, scheduling etc.