Recently, the smart fault current controller (FCC) was proposed in order to apply to the smart grid. The smart FCC consists of an HTS coil, an AC/DC rectifier, and a control unit. A fault current should be immediately limited by the inductance of the coil at the first peak, and then adjusted by controlling the rectifier. The larger inductance of the coil induces the lower fault current. However, a large inductance coil requires high cost and large size. To reduce the HTS conductor consumption, an HTS coil with a reversely magnetized core (RMC) was proposed. To verify the concept, two permanent magnets were installed. In this paper, various model coils were fabricated and applied to the FCC system: 1) air core, 2) open iron core, 3) closed iron core, 4) open core with RMC, and 5) closed core with RMC. Based on a comparative study on the five models, an HTS coil with a closed RMC has the lowest first peak current. The first peak current in the proposed model was 27.8% smaller than that of air core case. The experimental results show that the proposed concept is to reduce the wire consumption.
Bibliographical noteFunding Information:
Manuscript received September 13, 2011; accepted November 09, 2011. Date of publication November 16, 2011; date of current version May 24, 2012. This work was supported by the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy (20104010100590). M. C. Ahn is with the Department of Electrical Engineering, Kunsan National University, Jeonbuk 573-701, Korea (e-mail: firstname.lastname@example.org). J. Y. Jang and T. K. Ko are with the School of Electric and Electronic Engineering, Yonsei University, Seoul 120-749, Korea. Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TASC.2011.2176294 Fig. 1. Schematic drawing showing the smart FCC and location in a grid with grid-connected DGs. Smart FCC consists of four rectifying devices, a superconducting coil with freewheeling diode and resistor, and a control unit.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering