There are various types of fault current limiters (FCLs), which are made of different superconducting materials and have different designs. The bridge-type FCL is mainly composed of a diode bridge rectifier and a DC reactor. This FCL can control the fault current by controlling the DC reactor current. To enhance this capability, a resistor parallel with a semiconductor switch has been used in series with DC reactor. In this article, hysteresis technique has been proposed and integrated in this structure, which not only limit the fault current but also reduce total harmonic distortion (THD) at the point of common coupling (PCC). Therefore, the performance of all loads connected to PCC will not be affected during fault. The theory and properties of the proposed bridge-type FCL for limiting the fault current and producing sinusoidal voltage at PCC during fault has been presented, and its model has been simulated by power systems CAD/electromagnetic transients including DC. It is shown that the proposed FCL can effectively reduce the THD at PCC and limit the fault current.
This paper presents the combination of the bridge type fault current limiter and power converter for voltage quality improvement. Common diode bridge fault current limiter and power converter injected together by a common dc link in new structure system. The proposed system can be connected between the beginning and end of feeder connected to critical loads and point of common coupling (PCC) in distribution network. The proposed FCL has been Simulated and Studied by PSCAD/EMTDC.
A DC reactor type fault current limiter (FCL) in series with a downstream circuit breaker can be a solution to control fault current levels in electrical distribution systems. In order to integrate the DC reactor type FCL in to power grid, the performance of the DC reactor FCL should be studied. In this paper, short circuit analysis, based on the electromagnetic transient program (EMTP), has been used to investigate the behavior of the DC reactor type FCL installed in an electrical distribution grid. System studies show that the DC reactor type FCL can not only limit the fault current to an acceptable value, but also can mitigate the voltage sag. The Transient Recovery Voltage (TRV) could be damped in the presence of the DC reactor type FCL during fault clearing period, too.
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