Novel Protection Scheme of Single-Phase Earth Fault for Radial Distribution Systems With Distributed Generators

Abstract Recently, distributed generators (DGs) are being largely amalgamated with radial distribution systems because of their positive impacts on these systems such as voltage profile improvement and power loss minimization. However, if this integration is not well-planned, it can lead to serious problems in the protection devices. One of these problems is the recloser-fuse miscoordination. This paper presents an effective solution to the recloser-fuse miscoordination due to DGs integration with RDS. The proposed approach is based on suppressing the DG current during fault period so that the contribution of DG to the fault current becomes minimal. Two types of superconducting fault current limiters (SFCLs) namely, saturated iron-core and shielded iron-core SFCLs are studied and a comparison between their performance is presented. The proposed solution was implemented on IEEE 33-bus RDS. All simulation studies are performed on MATLAB script. The simulation results illustrated that saturated iron-core SFCL could not recover recloser-fuse coordination in some of the studied cases. However, shielded iron-core SFCL could successfully restore the recloser-fuse coordination in all the studied cases. This shows that shielded iron-core SFCL is preferred in solving recloser-fuse miscoordination.

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An Optimized Adaptive Protection Scheme for Distribution Systems Penetrated with Distributed Generators

Reliability Modeling and Analysis of Smart Power Systems ◽

10.1007/978-81-322-1798-5_4 ◽

2014 ◽

pp. 51-66

Author(s):

Ahmed H. Osman ◽

Mohamed S. Hassan ◽

Mohamad Sulaiman

Keyword(s):

Distribution Systems ◽

Protection Scheme ◽

Distributed Generators ◽

Adaptive Protection

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Discriminant-Analysis-Based Single-Phase Earth Fault Protection Using Improved PCA in Distribution Systems

IEEE Transactions on Power Delivery ◽

10.1109/tpwrd.2015.2408814 ◽

2015 ◽

Vol 30 (4) ◽

pp. 1974-1982 ◽

Cited By ~ 12

Author(s):

Yuanyuan Wang ◽

Jiaming Zhou ◽

Zewen Li ◽

Zhaoyang Dong ◽

Yao Xu

Keyword(s):

Discriminant Analysis ◽

Distribution Systems ◽

Single Phase ◽

Earth Fault ◽

Fault Protection

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Equivalent Model of a Three Phase System of Photovoltaic Generation to Analyze Voltage Variations in a Radial Distribution System

Scientia et technica ◽

10.22517/23447214.23391 ◽

2020 ◽

Vol 25 (2) ◽

pp. 205-215

Author(s):

Juan Camilo Toro-Cadavid ◽

Carlos Andrés Ramos-Paja ◽

Andrés Julián Saavedra-Montes

Keyword(s):

Radial Distribution ◽

Distribution System ◽

Distribution Systems ◽

Single Phase ◽

Parameters Estimation ◽

Photovoltaic System ◽

Photovoltaic Generation ◽

Radial Distribution System ◽

Three Phase ◽

Photovoltaic Generators

In this paper, the modelling of a three-phase photovoltaic system, for analyzing voltage variation in a radial distribution system, is presented. The radial distribution system is represented by a benchmark which is widely used in the analysis of distribution systems with distributed generation, and electrical microgrids. The parameters estimation of this model is performed by selecting the aerial distribution of conductors and then calculating the sequence components. Moreover, a model of a three-phase photovoltaic generation system for analyzing voltage variations is proposed. The model represents an array of photovoltaic panels, a dc/dc converter with its control system, and a three-phase inverter. The software MATLAB/Simulink is chosen to simulate both the distribution and the photovoltaic systems. All the components of the three-phase photovoltaic system are parametrized with information of commercial equipment. To facilitate the implementation of the system model in the analysis program, reduced models of its components are selected. Finally, the proposed model of the three-phase photovoltaic system is validated by simulating single-phase faults along the feeder and changes of irradiance over the photovoltaic generators and observing the voltage behavior in one node of the distribution system. The results show that irradiance changes and single-phase faults affect the voltage behavior depending on the photovoltaic penetration level and the generators location.

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