Summary:
This paper describes the experimentes carried out with a serires 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 that 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 continuosly as a function of the firing angle. A single-phase prototype has been built for closed-loop current control in an a.c. circuit. Conventional thyristors and firing circuits have been used for the prototype and no weitching-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.
Keywords: Current control, electric energy systems, superconducting coil, phase-angle control
JCR Impact Factor and WoS quartile: 1,800 - Q3 (2022)
DOI reference:
https://doi.org/10.1109/77.783302
Published on paper: June 1999.
Published on-line: June 1999.
Citation:
A. García-Cerrada, P. Mingorance, C. Fernández, A. Robertson, L. García-Tabarés, A. Grau, V. González, J.M. Rodríguez-García, J.F. Alonso-Llorente Line-current control with a series thyristor-controlled reactance based on a superconducting coil for electric-energy systems. IEEE Transactions on Applied Superconductivity. Vol. 9, nº. 2, pp. 330 - 333, June 1999. [Online: June 1999]
