Application of Multiple Resistive Superconducting Fault Current Limiters for Fast Fault Detection in Highly-Interconnected Distribution Systems

IEEE Transactions on Power Delivery (Impact Factor: 1.73). 11/2012; 28(2):1120-1127. DOI: 10.1109/TPWRD.2012.2228011


Superconducting fault current limiters (SFCLs) of-fer several benefits for electrical distribution systems, especially with increasing distributed generation and the requirements for better network reliability and efficiency. This paper examines the use of multiple SFCLs in a protection scheme to locate faulted circuits, using an approach which is radically different from typical proposed applications of fault current limitation, and also which does not require communications. The technique, referred to as "current division discrimination" (CDD), is based upon the intrinsic inverse current-time characteristics of resistive SFCLs, which ensures that only the SFCLs closest to a fault operate. CDD is especially suited to meshed networks and particularly when the network topology may change over time. Meshed networks are expensive and complex to protect using conventional methods. Simulation results with multiple SFCLs, using a thermal-electric superconductor model, confirm that CDD operates as expected. Nevertheless, CDD has limitations, which are examined in this paper. The SFCLs must be appropriately rated for the maximum system fault level, although some variation in actual fault level can be tolerated. For correct coordination between SFCLs, each bus must have at least three circuits that can supply fault current, and the SFCLs should have identical current-time characteristics. Index Terms—Distributed generation, fault current limitation, low-carbon, power system protection, superconducting fault cur-rent limiter (SFCL).

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Available from: Steven M. Blair, Oct 08, 2015
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    • "Another study on the coordination of protection relays between primary feeder and interconnecting transformer grounded by SFCL in wind farms is presented in [11]. In [12], the application of multiple resistive solid state SFCL for fast fault detection in highly interconnected distribution systems, based on current division discrimination, is proposed as a potential cost-efficient candidate to minimize the effect of exposing DG to the distribution system. A genetic based algorithm is employed to obtain SFCLs optimum number, location and size [13]. "
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    ABSTRACT: Advanced technologies in power electronics have always been a prominent factor in the development of new devices in power systems. Superconducting Fault Current Limiter (SFCL) can be regarded as a key component for future electric power systems. It is capable of eliminating the hazards during faults by increasing the short-circuit power of the network. SFCL devices can be either resistive (R-SFCL) or inductive (I-SFCL). They show negligible resistance or reactance, respectively, under normal operating conditions and they reliably switch to a high impedance state in the case of a high current. This paper studies the use of R-SFCL and I-SFCL by investigating their impacts on the short-circuit calculations of a high voltage line. The case study is for a 220 kV transmission line in the northern transmission network of Algeria which is subjected to a phase to ground fault in the presence of a fixed fault resistance. The impact of SFCL impedance (ZSFCL) of R-SFCL and I-SFCL on short-circuit parameters (symmetrical current components, transmission line currents, voltage symmetrical components, and transmission line voltages) is presented using a developed MATLAB program. Analysis and comparison of the obtained simulation results lead to the conclusion that using R-SFCL offers a better system performance than I-SFCL for the system under study.
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    ABSTRACT: In this paper, a resistive-type superconducting fault current limiter (SFCL) is suggested to improve the transient performance of a microgrid system during a fault. The microgrid is connected to the main network at the point of common coupling, where the resistive-type SFCL is applied. When a short-circuit fault happens at the connecting line, the SFCL can mitigate the fault current, and its action signal will be sent to the master distributed generation (DG) included in the microgrid. Accordingly, the switching between the master DG's two control patterns can be flexibly performed; furthermore the microgrid system is expected to achieve a smooth transition between its grid-connected and islanded modes. Theoretical analysis and a technical discussion are conducted, and the simulation model of a typical microgrid with the SFCL is built in MATLAB. From the demonstrated results, employing the resistive-type SFCL can effectively limit the transient fault current to a lower level, help guarantee the microgrid system's power balance, and enhance its voltage and frequency stability.
    IEEE Transactions on Applied Superconductivity 06/2015; 25(3):1-1. DOI:10.1109/TASC.2015.2391120 · 1.24 Impact Factor