Abstract
Different types of fault current limiters (FCLs) have been developed and designed based on non-superconducting DC reactors (NSDRs). This paper proposes a controllable dual-bridge FCL (CDBFCL) based on the NSDR for use in an AC-type micro-grid. It includes a NSDR and two series and shunt bridge circuits. The series bridge is based on diode semiconductor switches and is coupled in series with the line via a transformer. The shunt bridge is based on thyristor semiconductor switches and is coupled in parallel with the line. The shunt bridge provides a variable voltage source. It compensates for the DC side voltage drop due to NSDR resistance and semiconductor switches during normal operating condition. In addition, by controlling the shunt bridge firing angle, it produces a controllable DC voltage, which can control the fault current amplitude during a fault. The structure, principle operating work, and control system of the proposed CDBFCL are presented. The CDBFCL performance is studied analytically and through simulation by the PSCAD/EMTDC software. In addition, the simulation results are compared with those obtained experimentally from a prototype CDBFCL and show a close correlation.
Highlights
Due to the increasing penetration level of distributed generation (DG) systems in modern distribution systems, the concept of micro-grids (MGs) has emerged as a safe and reliable control method of DG systems [1]
A new controllable dual-bridge FCL (CDBFCL) with non-superconducting DC reactors (NSDRs) has been proposed for use in micro-grids
It consists of series and shunt bridges and a conventional NSDR instead of the superconducting reactor
Summary
Due to the increasing penetration level of distributed generation (DG) systems in modern distribution systems, the concept of micro-grids (MGs) has emerged as a safe and reliable control method of DG systems [1]. It cannot limit the steady-state fault current under fault conditions, which is the weak point of this type of BFCL. The voltage drop in the DC side is varied according to the line power variation, and the shunt bridge rectifier cannot compensate for the DC side voltage drop It cannot control the fault current magnitude under fault operating conditions. The shunt bridge is based on thyristor semiconductor switches and is coupled in parallel with the coupling bus, which produces a controllable DC voltage source It compensates for the DC side voltage drop and controls the fault current magnitude during normal and fault operating conditions, respectively. The simulation and measurements results are compared to illustrate the effectiveness of the CDBFCL
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