A Techno-Economic Feasibility Analysis on LVDC Distribution System for Rural Electrification in South Korea

Afamefuna, David; Chung, Ilyong; Hur, Don; Kim, Ju–Yong; Cho, Jintae

doi:10.5370/jeet.2014.9.5.1501

Cited by 13 publications

(7 citation statements)

References 8 publications

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“…The experience from the real rural ±750V LVDC test network as reported in [2] has concluded that LVDC is more efficient solution for rural AC networks when the feeder's lengths are over 1 km. LVDC distribution power systems have also been proposed to replace some of the Korea Electric Power Corporation (KEPCO) existing AC rural MV distribution networks (used for supplying light loads) in South Korea in order to save up to 5% of the total operating cost [16].…”

Section: Lvdc In Last Mile Power Distribution Networkmentioning

confidence: 99%

Protection analysis for plant rating and power quality issues in LVDC distribution power systems

Emhemed

Burt

2015

2015 IEEE Power &Amp; Energy Society General Meeting

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Low Voltage DC (LVDC) distribution systems have the potential to be considered as an efficient platform for facilitating the connection of more distributed energy resources. The applications of LVDC are still at an early stage due to the lack of mature experience and standards. Over and above, the protection challenges that are presented by integrating DC installations in existing AC systems are one of the key issues that are delaying the wide uptake of LVDC technologies. In response to these issues, this paper discusses the international installation progress of LVDC systems and their relevant standards in different sectors. This includes data centres, buildings, and utility last mile distribution systems. The paper also investigates the impact of using traditional LV protection methods on the performance of a faulted LVDC network, and on the associated post-fault power quality performance. A typical UK LV network is energised using DC and modelled in PSCAD, and used for the protection studies under different DC fault conditions

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Section: Lvdc In Last Mile Power Distribution Networkmentioning

confidence: 99%

Protection analysis for plant rating and power quality issues in LVDC distribution power systems

Emhemed

Burt

2015

2015 IEEE Power &Amp; Energy Society General Meeting

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“…However, in the case of DC distribution systems, the power conversion step can be omitted to enable a more efficient and economical operation, compared to the existing AC distribution system, when the DC distributed resources and DC consumers are connected [1]. Previous studies have confirmed the economics of the Direct Current (DC) distribution system [2]. In addition, the DC distribution system can effectively control voltage using the power conversion device instead of the transformer, and it can limit the fault current in case of an accident at the load side and prevent accidents from spreading to the main grid.…”

Section: Introductionmentioning

confidence: 99%

Application of a DC Distribution System in Korea: A Case Study of the LVDC Project

Kim

Cho

et al. 2019

Applied Sciences

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With the rapid expansion of renewable energy and digital devices, there is a need for direct current (DC) distribution technology that can increase energy efficiency. As a result, DC distribution research is actively underway to cope with the sudden digitization and decentralization of load environment and power supply. To verify the possibility of DC distribution, Korea Electric Power Corporation (KEPCO) Research Institute made a DC distribution system connected with a real power system in Gwangju. The construction of the demonstration area mainly includes design of protection and grounding systems, operating procedures of insulation monitoring device (IMD), and construction of power converters. Furthermore, this paper goes beyond the simulation and the lab testing to apply DC distribution to a real system operation in advance. It is designed as a long-distance low-loaded customer for rural areas and operated by the DC distribution. In addition, safety and reliability are confirmed through field tests of DC distribution elements such as power conversion devices, protection and grounding systems. In particular, to improve the reliability of non-grounding system, the insulation monitoring device was installed and the algorithms of its operational procedures are proposed. Finally, this paper analyzes the problems caused by operating the actual DC distribution and suggests solutions accordingly.

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“…In particular, many studies on AC/DC converters that connect with existing high-voltage AC systems are in development [2]. This paper focuses on the design, manufacturing, and demonstration of AC/DC power converters for converting high-voltage AC systems in a mountainous area, which come into frequent contact with trees, to an LVDC distribution system [3,4]. First of all, the capacity of the power converter is chosen by analyzing the load of the system, its switching elements, protection devices, and switching frequencies are chosen to ensure stable operation and high efficiency.…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Bi-Directional Single-Phase AC/DC Converter Design and Field Application for LVDC Distribution

Kim

Cho

et al. 2019

Energies

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This paper describes the design and field application of a high-efficiency single-phase AC/DC converter that is suitable for distribution lines. First, an appropriate AC/DC converter was designed in consideration of the environment of the application system. In order to ensure high efficiency and high reliability, we designed an optimum switching element and capacitor suitable for the converter, and the protection element of the AC/DC converter was designed based on these elements. The control function for the power converter suitable for an LVDC distribution system is proposed for highly reliable operation. The AC/DC converter was manufactured based on the design and its performance was verified during application in an actual low-voltage DC (LVDC) distribution grid through tests at the demonstration site. The application to a DC distribution system in an actual grid is very rare and it is expected that it will contribute to the expansion of LVDC distribution. function of an AC/DC converter suitable for an LVDC distribution system is applied for highly reliable power supply when it is connected with the real system. The equipment is manufactured based on the design contents and a performance demonstration is carried out by constructing a system at an LVDC distribution site with the similar environment before being applied to in an actual distribution grid. The on-site demonstration is required to verify the performance of the protection behavior through load fluctuations and line fault simulations. We present the demonstration results from the AC/DC converter to a low-load and low-voltage long-distance DC distribution system. The case of applying the LVDC distribution system to an actual distribution grid is very rare in the world, and the developed power converter, which is applied to DC systems with high efficiency, single phase, and bi-directional power transmission, has differences in its design and performance compared to existing products. Therefore, this paper provides a guideline of design and manufacturing of SiC-MOSFET-based AC/DC converter for LVDC distribution system. It may contribute to related researchers and engineers by presenting various analyses and validation of the actual implementation in LVDC demonstration site. In addition, this paper presents the standard of the design and specifications for the power converter required for the power distribution system by analyzing the AC/DC converter's operation history and results.

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A Techno-Economic Feasibility Analysis on LVDC Distribution System for Rural Electrification in South Korea

Cited by 13 publications

References 8 publications

Protection analysis for plant rating and power quality issues in LVDC distribution power systems

Protection analysis for plant rating and power quality issues in LVDC distribution power systems

Application of a DC Distribution System in Korea: A Case Study of the LVDC Project

High-Efficiency Bi-Directional Single-Phase AC/DC Converter Design and Field Application for LVDC Distribution

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