Efficient and Comprehensive Evaluation Method of Temporary Overvoltage in Distribution Systems with Inverter-Based Distributed Generations
- Authors
- Cho, Namhun; Lee, Moonjeong; Yoon, Myungseok; Choi, Sungyun
- Issue Date
- 7월-2021
- Publisher
- MDPI
- Keywords
- 3D graph; distributed generation; effective grounding; inverter-based DG; single line-to-ground fault; temporary overvoltage (TOV)
- Citation
- SUSTAINABILITY, v.13, no.13
- Indexed
- SCIE
SSCI
SCOPUS
- Journal Title
- SUSTAINABILITY
- Volume
- 13
- Number
- 13
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/127811
- DOI
- 10.3390/su13137335
- ISSN
- 2071-1050
- 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.
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