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

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.

Modeling of steady state fault current contribution of inverter-connected generation in PSS/e

2021 ◽  
Author(s):  
Lukas Sigrist ◽  
Javier Renedo ◽  
Francisco Miguel Echavarren ◽  
Francisco Perez Thoden ◽  
Luis Rouco
Keyword(s):  
Steady State ◽  
Fault Current ◽  
Current Contribution

Stability Analysis of Unbalanced Distribution Systems With Synchronous Machine and DFIG Based Distributed Generators

2014 ◽  
Vol 5 (5) ◽  
pp. 2326-2338 ◽  
Author(s):  
Ehsan Nasr-Azadani ◽  
Claudio A. Canizares ◽  
Daniel E. Olivares ◽  
Kankar Bhattacharya
Keyword(s):  
Stability Analysis ◽  
Distribution Systems ◽  
Synchronous Machine ◽  
Distributed Generators

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.

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