Analysis on fault current limiting and bus-voltage sag suppressing operations of SFCLs using magnetic coupling of two coils according to their application locations in a power distribution system

Increased utilization of nonlinear loads in the power distribution system with profound integration of renewable energy requires improved power quality control. This paper proposes a Reformed Second Order Generalized Integrated (R-SOGI) control scheme for enhancing the output of the Dynamic Voltage Restorer (DVR) for the objective of achieving the desired sinusoidal voltage wave shape at the common point of services and harmonic reduction. The DVR incorporates a Solar Photovoltaic (SPV) system using the Z-source Inverter (ZSI), providing the necessary active power to mitigate the voltage sag/swell and power demand. ZSI offers step-down as well as step-up abilities, it makes the converters to operate in the conditions of shoot-through. Therefore, the application of ZSI-based DVR topology seems very promising. The compensating reference voltage is generated by the R-SOGI algorithm, which offers superior output under conditions for grid voltage irregularities, including voltage sag/swell and unbalanced and distorted utility grid voltages. In comparison to DVR based on the VSI voltage inverter (VSI), the response from ZSI-DVR to a reduction of voltage distortions and harmonics is investigated. An experimental SPV ZSI-DVR prototype is developed in the laboratory to check the effectiveness of the controller and is tested under balanced and unbalanced supply and dynamic load conditions.

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Impact of Distributed Generation on the Fault Current in Power Distribution System

Indonesian Journal of Electrical Engineering and Computer Science ◽

10.11591/ijeecs.v6.i2.pp357-367 ◽

2017 ◽

Vol 6 (2) ◽

pp. 357

Author(s):

Zuhaila Mat Yasin ◽

Izni Nadhirah Sam’ón ◽

Norziana Aminudin ◽

Nur Ashida Salim ◽

Hasmaini Mohamad

Keyword(s):

Power System ◽

Distributed Generation ◽

Power Distribution ◽

Distribution System ◽

Test System ◽

Optimal Location ◽

Fault Current ◽

Double Line ◽

Power Distribution System ◽

The Impact

<p>Monitoring fault current is very important in power system protection. Therefore, the impact of installing Distributed Generation (DG) on the fault current is investigated in this paper. Three types of fault currents which are single line-to-ground, double line-to-ground and three phase fault are analyzed at various fault locations. The optimal location of DG was identified heuristically using power system simulation program for planning, design and analysis of distribution system (PSS/Adept). The simulation was conducted by observing the power losses of the test system by installing DG at each load buses. Bus with minimum power loss was chosen as the optimal location of DG. In order to study the impact of DG to the fault current, various locations and sizes of DG were also selected. The simulations were conducted on IEEE 33-bus distribution test system and IEEE 69-bus distribution test system. The results showed that the impact of DG to the fault current is significant especially when fault occurs at busses near to DG location.</p>

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Analysis on Voltage Sag in Power Distribution System according to SFCL's Impedance for Protective Coordination with Large Transformer

The Transactions of the Korean Institute of Electrical Engineers P ◽

10.5370/kieep.2014.63.4.312 ◽

2014 ◽

Vol 63 (4) ◽

pp. 312-316

Author(s):

Jin-Seok Kim ◽

Jong-Fil Moon

Keyword(s):

Power Distribution ◽

Distribution System ◽

Voltage Sag ◽

Power Distribution System

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