Efficient and Comprehensive Evaluation Method of Temporary Overvoltage in Distribution Systems with Inverter-Based Distributed Generations

Namhun Cho, Moonjeong Lee, Myungseok Yoon and Sungyun Choi
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Namhun Cho: Korea Electric Power Research Institute, Daejeon 34056, Korea
Moonjeong Lee: School of Electrical Engineering, Korea University, Seoul 02841, Korea
Myungseok Yoon: School of Electrical Engineering, Korea University, Seoul 02841, Korea
Sungyun Choi: School of Electrical Engineering, Korea University, Seoul 02841, Korea

Sustainability, 2021, vol. 13, issue 13, 1-20

Abstract: In general, a temporary overvoltage (TOV) on the healthy phases occurs because of the neutral-shift phenomenon during a single line-to-ground (SLG) fault. The TOV can destroy the insulation of electric devices and cause damage to other equipment and customer loads in just a few cycles. In practice, the TOV can be affected by numerous factors: the sequence reactance ratio of the interconnection transformer, the ratio of load to DG, and the distance to the fault. More importantly, inverter-based distributed generations (DGs) have different influences on the TOV from traditional synchronous-machine-based DGs. In this sense, this work performed an efficient and comprehensive investigation on the effect of these various parameter types and their extensive variations, based on steady-state analysis with sequence equivalent circuits and three-dimensional representations. The proposed methodology can facilitate judging the impact of multi-parameter conditions on the TOV readily and comparing the fault characteristics of synchronous-machine-based and inverter-based DGs. Finally, the results can be used for future studies on TOV mitigation techniques.

Keywords: 3D graph; distributed generation; effective grounding; inverter-based DG; single line-to-ground fault; temporary overvoltage (TOV) (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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