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자료유형
학술저널
저자정보
Trinh Phi Hai (Kookmin University) Il-Yop Chung (Kookmin University) Taehoon Kim (한국전력거래소) Juyong Kim (Korea Electric Power Research Institute (KEPRI))
저널정보
대한전기학회 Journal of Electrical Engineering & Technology Journal of Electrical Engineering & Technology Vol.13 No.4
발행연도
2018.7
수록면
1,459 - 1,473 (15page)

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This paper focuses on voltage control schemes for multi-terminal low-voltage direct current (LVDC) distribution systems. In a multi-terminal LVDC distribution system, there can be multiple AC/DC converters that connect the LVDC distribution system to the AC grids. This configuration can provide enhanced reliability, grid-supporting functionality, and higher efficiency. The main applications of multi-terminal LVDC distribution systems include flexible power exchange between multiple power grids and integration of distributed energy resources (DERs) using DC voltages such as photovoltaics (PVs) and battery energy storage systems (BESSs). In multi-terminal LVDC distribution systems, voltage regulation is one of the most important issues for maintaining the electric power balance between demand and supply and providing high power quality to end customers. This paper focuses on a voltage control method for multi-terminal LVDC distribution system that can efficiently coordinate multiple control units, such as AC/DC converters, PVs and BESSs. In this paper, a control hierarchy is defined for undervoltage (UV) and overvoltage (OV) problems in LVDC distribution systems based on the control priority between the control units. This paper also proposes methods to determine accurate control commands for AC/DC converters and DERs. By using the proposed method, we can effectively maintain the line voltages in multi-terminal LVDC distribution systems in the normal range. The performance of the proposed voltage control method is evaluated by case studies.

목차

Abstract
1. Introduction
2. Voltage control in LVDC distribution system
3. Proposed Voltage Control Scheme for Multi-terminal LVDC Distribution System
4. Calculation of Control Commands for AC/DC Converters and DERs
5. Case studies
6. Conclusion and Discussion
References

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UCI(KEPA) : I410-ECN-0101-2018-560-002230540