Conceptual design of a high-speed electromagnetic switch for a modified flux-coupling-type SFCL and its application in renewable energy system

Abstract

The modified flux-coupling-type superconducting fault current (SFCL) is a high-efficient electrical auxiliary device, whose basic function is to suppress the short-circuit current by controlling the magnetic path through a high-speed switch. In this paper, the high-speed switch is based on electromagnetic repulsion mechanism, and its conceptual design is carried out to promote the application of the modified SFCL. Regarding that the switch which is consisting of a mobile copper disc, two fixed opening and closing coils, the computational method for the electromagnetic force is discussed, and also the dynamic mathematical model including circuit equation, magnetic field equation as well as mechanical motion equation is theoretically deduced. According to the mathematical modeling and calculation of characteristic parameters, a feasible design scheme is presented, and the high-speed switch’s response time can be less than 0.5 ms. For that the modified SFCL is equipped with this high-speed switch, the SFCL’s application in a 10 kV micro-grid system with multiple renewable energy sources are assessed in the MATLAB software. The simulations are well able to affirm the SFCL’s performance behaviors.

Coordinated Control of Superconducting Fault Current Limiter and Superconducting Magnetic Energy Storage for Transient Performance Enhancement of Grid-Connected Photovoltaic Generation System

“…According to the expression of the current-limiting impedance, the suggested SFCL is a resistive-inductive type (hybrid type) SFCL, and the combined use of the resistive and inductive components may bring more positive contributions, such as inhibiting active and reactive power fluctuations, providing critical assistance to reliabilities and securities of power systems more effectively [58,59]. In addition, considering the response speed of the CS will directly affect the rapidity of the current-limiting action, the conceptual design of a high-speed electromagnetic switch for the SFCL has been conducted, and this high-speed switch's response time can be less than 0.5 ms [60].…”

Development of a Voltage Compensation Type Active SFCL and Its Application for Transient Performance Enhancement of a PMSG-Based Wind Turbine System

“…Considering the rapid development of high temperature superconducting (HTS) materials, superconducting power applications have attracted more and more attention in the power industry, particularly for electrical systems with renewable energy [1][2][3][4][5][6]. Superconducting fault current limiter (SFCL), superconducting magnetic energy storage (SMES), superconducting transformer, and superconducting power cable have obtained lots of successful engineering projects around the world.…”