scholarly journals Fault Current Negative Contribution Method for Inverter-Based Distributed Generators Under Grid Unbalanced Fault

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 220807-220815
Author(s):  
Xubin Liu
Keyword(s):  
Fault Current ◽  
Negative Contribution ◽  
Distributed Generators

scholarly journals Separated Phase–Current Controls Using Inverter-Based DGs to Mitigate Effects of Fault Current Contribution from Synchronous DGs on Recloser–Fuse

2019 ◽  
Vol 9 (20) ◽  
pp. 4311 ◽  
Author(s):  
Boonyapakdee ◽  
Konghirun ◽  
Sangswang
Keyword(s):  
Dynamic Performance ◽  
Voltage Regulation ◽  
Current Control ◽  
Current Phase ◽  
Fault Current ◽  
Grid Voltage ◽  
Phase Current ◽  
Distributed Generators ◽  
Current Contribution ◽  
Measurement Units

Synchronous distributed generators (SDGs) significantly affect recloser–fuse coordination due to the high fault current contribution. This paper proposes a separated phase–current control using inverter-based distributed generators (IBDGs) to remove the effects of fault current contributions from SDGs during unsymmetrical faults. The three-phase current produced by IBDGs is independently controlled. While the total fault current is reduced by adjusting the current phase angle in the faulty phase, the energy in the DC-link capacitor (Cdc) is delivered to the grid in order to avoid the rise of DC-link voltage (Vdc) by means of injection of the active current into the nonfaulty phase. To maintain the proper grid voltage, the voltage regulation feature is installed in the IBDGs. Moreover, current estimations programmed within the IBDGs are introduced to avoid the performance degradation of separated phase–current controls caused by phasor measurement units (PMUs). The dynamic performance of the separated phase–current controls using IBDGs was evaluated using an IEEE 34-node radial test feeder. According to the simulation results, the IBDGs could eliminate the effects of fault current contributions from the SDG without interruption since the disconnections caused by excessive Vdc were prevented. They could also regulate the grid voltage in the nonfaulty phase.

Simplified and Automated Fault-Current Calculation for Fault Protection System of Grid-Connected Low-Voltage AC Microgrids

2017 ◽  
Vol 18 (2) ◽  
Author(s):  
Duong Minh Bui
Keyword(s):  
Low Voltage ◽  
Operation Mode ◽  
Distribution Coefficients ◽  
Fault Analysis ◽  
Fault Current ◽  
Analysis Method ◽  
Distributed Generators ◽  
Overcurrent Relays ◽  
Current Calculation ◽  
Ac Microgrid

Abstract Fault currents inside a grid-connected AC microgrid are significantly varied because fault current contributions of the main grid and DG units are different from each other due to various fault locations, fault types, and high penetration of inverter-based distributed generators (IBDGs) and rotating-based distributed generators (RBDGs). A traditional fault-analysis method cannot be sufficiently applicable for AC microgrids with the presence of both rotating-based distributed generators and inverter-based distributed generators. From the above viewpoint, this paper proposes a simplified and automated fault-current calculation approach for grid-connected AC microgrids to quickly and accurately calculate fault-current contributions from IBDGs and RBDGs as well as the grid fault-current contribution to any faulted microgrid sections. The simplified and automated fault-current calculation approach is mainly focused on grid-connected and small-sized low-voltage AC microgrids with the support of communication system. Under the grid-connected microgrid operation mode, fault-tripping current-thresholds of adaptive overcurrent relays are properly adjusted thanks to the proposed fault analysis method. Relying on fault-current distribution-coefficients of IBDGs, RBDGs, and the utility grid, the setting values of adaptive overcurrent relays in a low-voltage AC microgrid are effectively self-adjusted according to various microgrid configurations and the operation status of DG units during the grid-connected mode.

Fault Current Contribution From Synchronous Machine and Inverter Based Distributed Generators

2007 ◽  
Vol 22 (1) ◽  
pp. 634-641 ◽  
Author(s):  
Natthaphob Nimpitiwan ◽  
Gerald Thomas Heydt ◽  
Raja Ayyanar ◽  
Siddharth Suryanarayanan
Keyword(s):  
Synchronous Machine ◽  
Fault Current ◽  
Distributed Generators ◽  
Current Contribution

Fault Current Management Using Inverter-Based Distributed Generators in Smart Grids

2014 ◽  
Vol 5 (5) ◽  
pp. 2183-2193 ◽  
Author(s):  
Nazila Rajaei ◽  
Mohammed Hassan Ahmed ◽  
M. M. A. Salama ◽  
Rajiv K. Varma
Keyword(s):  
Smart Grids ◽  
Fault Current ◽  
Current Management ◽  
Distributed Generators

Comparison between saturated-iron core and shielded-iron core superconducting fault current limiters on recloser-fuse coordination of radial distribution systems connected with distributed generation

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Aliaa Arafa ◽  
Salah Kamel ◽  
Mohamed M. Aly
Keyword(s):  
Radial Distribution ◽  
Distribution Systems ◽  
Iron Core ◽  
Fault Current ◽  
Voltage Profile ◽  
Loss Minimization ◽  
Distributed Generators ◽  
Fault Current Limiters ◽  
Protection Devices ◽  
Voltage Profile Improvement

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.

scholarly journals Optimasi DOCR Pada Sistem Distribusi Loop dengan Pembangkit Tersebar Menggunakan Algoritma Modified Particle Swarm Optimastion (MPSO)

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Daeng Rahmatullah ◽  
Belly Yan Dewantara
Keyword(s):  
Operating Time ◽  
Particle Swarm ◽  
System Change ◽  
Loop System ◽  
Fault Current ◽  
Optimum Time ◽  
Protection Relay ◽  
Distributed Generators ◽  
Protection Time ◽  
The Right

<em>To design the coordination of protection on radial systems is not difficult, but the loop system is challenging for researchers, plus loop systems connected with distributed generators (DG). For setting up Directional Overcurent Relay (DOCR) in loop system only use lowset, so the operating time of release depends on rated of fault current. The fault current will vary if there is DG in the system. Change ON/ OFF DG will also make the direction of the current fluctuate. So we have to reset the protection relay. To re-setting the protection system researchers need more time. The Modified Particle Swarm Optimation (MPSO) method is recommended to reduce the calculation time of the protection relay and obtain the most optimum protection time in loop system with DG. Full load ampere (IFLA) equipment and Maximum fault current (Isc max) as inputs MPSO and lowset as outputs MPSO. Lowset output of MPSO then put on rele as setting DOCR. The results of this study have been tested in simulation using ETAP software successfully and it is clear that MPSO method is the right method to obtain the release settings with the most optimum time.</em>

Effect of Renewable Distributed Generators on the Fault Current Level of the Power Distribution Systems

2012 ◽  
Vol 622-623 ◽  
pp. 1882-1886
Author(s):  
Hadi Zayandehroodi ◽  
Azah Mohamed ◽  
Hussain Shareef ◽  
Masoud Farhoodnea ◽  
Marjan Mohammadjafari
Keyword(s):  
Power Distribution ◽  
Distribution System ◽  
Distribution Systems ◽  
Short Circuit ◽  
Power Source ◽  
Current Level ◽  
Fault Current ◽  
Power Distribution Systems ◽  
Distributed Generator ◽  
Distributed Generators

The presence of renewable distributed generator (RDG) in a distribution system will have unfavorable impact on the operating system because the distribution system is no longer radial in nature and is not supplied by a single main power source. With RDGs in a distribution network, it brings about a change in the fault current level of the system and causes many problems in the protection system, such as false tripping of protective devices, protection blinding, an increase and decrease in short-circuit levels. This paper presents the effect of RDGs on the fault current level of the system. The operating protection issues particularly in cases where RDGs are added to a LV distribution feeder are also discussed.

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