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http://dx.doi.org/10.5762/KAIS.2021.22.4.587

A Study on Characteristics and Modeling of CMV by Grounding Methods of Transformer for ESS  

Choi, Sung-Moon (Korea University of Technology and Education)
Kim, Seung-Ho (Global Electricity Co. Ltd)
Kim, Mi-Young (Howon University)
Rho, Dae-Seok (Korea University of Technology and Education)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.22, no.4, 2021 , pp. 587-593 More about this Journal
Abstract
Since 2017, a total of 29 fire accidents have occurred in energy storage systems (ESSs) as of June 2020. The common mode voltage (CMV) is one of the electrical hazards that is assumed to be a cause of those fire accidents. Several cases of CMV that violate the allowable insulation level of a battery section are being reported in actual ESS operation sites with △-Y winding connections. Thus, this paper evaluates the characteristics of CMV. An ESS site was modeled with an AC grid, PCS, and battery sections using PSCAD/EMTDC software. As a result of a simulation based on the proposed model, it was confirmed that characteristics of CMV vary significantly and are similar to actual measurements, depending on the grounding method of the internal transformer for PCS. The insulation level of the battery section may be severely degraded as the value of CMV exceeds the rated voltage in case of a grounding connection. It was found that the value of CMV dramatically declines when the internal transformer for PCS is operated as non-grounding connection, so it meets the standard insulation level.
Keywords
CMV; ESS; PCS; IGBT; Noise; $Y-{\Delta}$ winding method; ${\Delta}-Y$ winding method; Grounding; Non-grounding; PSCAD/EMTDC software;
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Times Cited By KSCI : 1  (Citation Analysis)
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