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Line-current control with a series thyristor-controlled reactance based on a superconducting coil for electric-energy systems

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9 Author(s)
A. Garcia-Cerrada ; IIT, Univ. Pontifica Comillas, Madrid, Spain ; P. Mingorance ; C. Fernandez ; A. Robertson
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This paper describes the experiments carried out with a series controlled reactance to be used for line-current control in an electric power transmission line. The controlled reactance has been built with a superconducting coil which can be short-circuited by two inverse parallel thyristors. It is shown that, if the thyristors are fired at a variable angle every cycle, the effective series impedance of the device can be varied continuously as a function of the firing angle. A single-phase prototype has been built for closed-loop current control in an AC circuit. Conventional thyristors and firing circuits have been used for the prototype and no switching-off control is necessary. The same technology is frequently used in electric energy systems. The controller has been fully implemented using a digital signal processor (DSP) and a commercial real-time interface. This gives good flexibility to the controller design and test. The paper investigates experimental results for the steady state and the transient performance of the prototype.

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IEEE Transactions on Applied Superconductivity  (Volume:9 ,  Issue: 2 )