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Contribution for the Study of the Integration of Inductive Superconducting Fault Current Limiters in Electrical Distribution Grids
Publication . Vilhena, Nuno Manuel Gonçalves; Pina, João; Pronto, Anabela; Álvarez García, Alfredo
A wider adoption of distributed generation sources and an increased
interconnection of networks tend to increase the complexity of electric power grids, thus
causing a surge in failures, especially short-circuits. The conventional solution against
short-circuit currents, for example, the construction of new substations, splitting of
busbars, even updating the technology of the existing current limiters may prove either
economically or technically unfeasible. Fault current limiters, mainly the superconducting
fault current limiters, have already demonstrated their viability in electric power grids.
Fault current limiter devices at normal operation are invisible to the grid, acting almost
instantly upon a fault, returning to their normal state upon its correction.
To disseminate these technologies, the development of straightforward design
tools is required. These tools must consider the properties of the available constitutive
elements of the devices. Behind these design tools, the integrity of the fault current
limiter should be assured during its operation. Problems regarding the electrodynamic
forces developed under short-circuit events must be properly characterized because they
can damage windings, causing device breakage and affecting the power grid.
In this thesis, a design methodology that intends to model and optimise saturated
cores superconducting fault current limiters is presented. This methodology considers
the characteristics of each constitutive element of the limiter while addressing utility
requirements and power grid characteristics. Genetic algorithms are used both to
optimise the constitutive elements of the limiter and its performance in the power grid.
In order to validate the present methodology, a three-phase superconducting fault
current limiter is designed/optimised, built and tested. The electrodynamic forces
analysis developed in superconducting tapes of an inductive transformer type
superconducting fault current limiter, under short-circuit conditions is performed.
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Fundação para a Ciência e a Tecnologia
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SFRH
Número da atribuição
SFRH/BD/92010/2012