Abstract
This study presents a new strategy for implementing the superconducting fault current limiter SFCL in order not only to limit short - circuit currents but also to improve the stability of electrical networks in the presence of faults. The calculation of the impedance that the limiter must introduce into the test network at the moment of the failure is obtained from a three-dimensional computation code, developed and implemented under MATLAB environment where the formulation in magnetic vector potentials A and scalar potential Electric V is adopted to solve the electromagnetic problem and the heat diffusion formulation is adopted also to solve the thermal problem. The coupling is ensured by an alternating algorithm and the numerical resolution of the problem is ensured by the method of the finite volumes in its three-dimensional version in order to avoid certain problems of numerical convergence linked to the strongly nonlinear character of the problem to be solved. The modeling of the network tests will be made by PSAT under the environment MATLAB.
Highlights
The study of the stability of electrical networks is one of the most important aspects in the analysis of power systems
Several simulation works have been proposed. In some of these works, the behavior of the superconductor is simulated as a vari-impedance [7], [8,9] where the superconducting material changes from nondissipative state characterized by a zero impedance in the rated regime of the network to a very dissipative state characterized by a high impedance in the case of faults that can appear during the operation of the electrical network
The optimal value of the Critical clearing time (CCT) is determined by trial and error
Summary
The study of the stability of electrical networks is one of the most important aspects in the analysis of power systems. The most important aim of stability studies is to find dynamic behavior the main variables that determine the operation of the generators as well as the angle, speed, current, voltage and power [5] Even with these variables, it is possible to determine the critical time of fault elimination or the stability margin. In some of these works, the behavior of the superconductor is simulated as a vari-impedance [7], [8,9] where the superconducting material changes from nondissipative state characterized by a zero impedance in the rated regime of the network to a very dissipative state characterized by a high impedance in the case of faults that can appear during the operation of the electrical network These simple models developed do not satisfactorily reflect the actual behavior of the superconductor in its intermediate state, the flux-flow and flux-creep regimes [10]. VOL. 9, NO. 2, OCTOBER 2020 the MATLAB environment and analysis is performed with the fault located in a bus
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