Article

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

ABSTRACT

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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    • "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.
    Full-text · Article · Sep 2015 · Elektrotehniski Vestnik/Electrotechnical Review
  • Source
    • "Another study on the coordination of protection relays between primary feeder and interconnecting transformer grounded by SFCL in wind farms was 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, was proposed as a potential cost-efficient candidate to minimize the effect of exposing DG to the distribution system. A genetic based algorithm was employed to obtain SFCLs optimum number, location and size [13]. "

    Full-text · Conference Paper · Dec 2014
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    ABSTRACT: The feasibility of a conduction-cooled MgB2-based superconducting fault-current limiter with fast recovery is investigated. A real-scale device for a distribution network is considered. The dc resistive configuration is chosen in order to avoid ac losses and to allow conduction cooling. A high-heat-capacity cable is specifically developed in order to cope with the requirement of fast recovery. A short-length sample of the cable is manufactured in order to assess its feasibility. The detailed design of a prototype is also carried out, and the performance is numerically investigated.
    No preview · Article · Oct 2013 · IEEE Transactions on Applied Superconductivity
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