Abstract
As the power load demand is rapidly increasing nowadays, many new power generation units are continuously connected to the power system such as small hydropower, wind power, solar cell, and so on. However, in a distribution system, the presence of Distributed Generators (DGs) would generally change the distribution system's behavior. This change can affect to the operation and protection of devices in power system and the original parameters will be deviated. Especially, the fault current of power system with DGs is dramatically increasing, and Superconducting Fault Current Limiter (SFCL) has attracted lots of attention as one of the best correctives to solve these issues. This paper proposes a strategy on application of SFCL in distribution system to solve the problems related to excessive short-circuit current and the mitigation of voltage sag due to the introduction of the DGs. Firstly, a Resistive-type SFCL (R_SFCL) is modeled by Matlab/Simulink. Next, a distribution system of Southern Vietnam power system is selected and simulated. Finally, according to the simulation results, the short circuit current and voltage sag improvements can be validated.
Highlights
Due to the rapid growth of load demand, different power sources of green house gases renewable energy (RES) such as photovoltaic (PV) wind power, bio fuel and bio mass are have added to the power system, and the interconnection among various power devices for a modern electric grid becomes more and more complicated
We have investigated the fault current limiter and evaluated the effects of Superconducting Fault Current Limiter (SFCL) in a distribution system with Distributed Generators (DGs) of 22 kV Vietnam power system
Case 2: Without SFCL and with DGs: The purpose of the study presented is an analysis of the fault current limiter and voltage sag of case 2, where SFCL is installed at starting point and a fault occurred at feeder 1
Summary
Due to the rapid growth of load demand, different power sources of green house gases renewable energy (RES) such as photovoltaic (PV) wind power, bio fuel and bio mass are have added to the power system, and the interconnection among various power devices for a modern electric grid becomes more and more complicated. SFCL is an attractive device that limits the short circuit rapidly and effectively without affecting the power system during normal operation. One of the most significant issues regarding power quality is voltage sag [15]. The voltage sag is indicative of power quality degradation and is a useful measure of the fault event. There is little progress in the studies on the impact of SFCL’s application in improving voltage sags of a distribution system with DGs. In this paper, we have investigated the fault current limiter and evaluated the effects of SFCL in a distribution system with DGs of 22 kV Vietnam power system.
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