A Study on Protection Coordination Method in 5 kV MVDC Off-Grid MG System

IF 1.6 4区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

Journal of Electrical Engineering & Technology Pub Date : 2024-05-10 DOI:10.1007/s42835-024-01918-4

Sung-Moon Choi, Ji-Myung Kim, Hyun-Sang You, Na-Kyung Lee, Man-Seok Son, Dae-Seok Rho

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引用次数: 0

Abstract

MVDC(Medium Voltage DC) distribution system has been on the rise for large transmission capacity with low energy loss, undersea power transmission, and so forth. Recently it has been a key factor of renewable energy transmission in the smartgrid. However, in the process of the design and the implementation of the protection devices for the grid, engineers face the difficulties to find out MVDC equipments, especially commercialized protection coordination devices, such as hybrid CB, VCB, ACB, MCCB, fuse, power contactors(CTR), etc. And those equipments have generally provided the narrow range of the DC rated voltage and the rated current and the power capacity, and given few types of the protective relay with narrow range. It gives a big restriction to design the protection elements and apply the equipments into the grid. This paper presents the protection coordination methods to design and operate the actual application for 5 kV MVDC grid with distributed generators(DG). And also, this paper performs the modeling of 5 kV MVDC grid including protection devices such as fuse, MCCB, CTR based on the PSCAD/EMTDC. From the simulation results of the operation characteristics of protection device according to the potential scenarios, it is confirmed that appropriate protection devices have been selected for the MVDC off-grid MG system, and protection cooperation is properly performed for all possible fault locations.

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5 千伏中压直流离网 MG 系统中的保护协调方法研究

中压直流（MVDC）配电系统在大容量低能耗输电、海底输电等方面的应用日益增多。最近，它已成为智能电网中可再生能源传输的关键因素。然而，在电网保护装置的设计和实施过程中，工程师们面临着寻找中压直流设备的困难，尤其是商业化的保护协调装置，如混合式 CB、VCB、ACB、MCCB、熔断器、电力接触器（CTR）等。而这些设备提供的直流额定电压、额定电流和功率容量范围普遍较窄，给出的继电保护装置类型也较少。这给保护元件的设计和设备在电网中的应用带来了很大的限制。本文介绍了保护协调方法，以设计和运行带有分布式发电机（DG）的 5 kV MVDC 电网的实际应用。此外，本文还基于 PSCAD/EMTDC 对包括熔断器、MCCB、CTR 等保护装置在内的 5 kV MVDC 电网进行了建模。根据可能发生的情况对保护装置的运行特性进行的仿真结果表明，已为中压直流离网 MG 系统选择了合适的保护装置，并在所有可能的故障位置正确执行了保护配合。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Electrical Engineering & Technology ENGINEERING, ELECTRICAL & ELECTRONIC-

CiteScore

4.00

自引率

15.80%

发文量

321

审稿时长

3.8 months

期刊介绍： ournal of Electrical Engineering and Technology (JEET), which is the official publication of the Korean Institute of Electrical Engineers (KIEE) being published bimonthly, released the first issue in March 2006.The journal is open to submission from scholars and experts in the wide areas of electrical engineering technologies. The scope of the journal includes all issues in the field of Electrical Engineering and Technology. Included are techniques for electrical power engineering, electrical machinery and energy conversion systems, electrophysics and applications, information and controls.