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ORIGINAL RESEARCH article

Front. Energy Res.
Sec. Energy Storage
Volume 12 - 2024 | doi: 10.3389/fenrg.2024.1495854
This article is part of the Research Topic Research on Multi-Energy Integration for Carbon Emission Reduction View all 5 articles

Research on DC interconnection system based on cascaded three-level converter for island multi-energy microgrid

Provisionally accepted
Xiaomin Liu Xiaomin Liu 1Zheng Wang Zheng Wang 1Shangke Liu Shangke Liu 1Bin Bai Bin Bai 1Xiangnan Du Xiangnan Du 2*
  • 1 State Grid Ningxia Electric Power Economic Research Institute, China, State Grid Ningxia Electric Power Company, Ningxia, China
  • 2 NARI China-EPRI Electrical Engineering Co., Ltd., State Grid Corporation of China (SGCC), Beijing, China

The final, formatted version of the article will be published soon.

    With the world's low-carbon energy transformation, Island microgrid is developing rapidly because it can achieve energy saving and carbon reduction. Island multi-energy microgrid includes photovoltaic, double-fed fan, battery energy storage system,and AC and DC loads.However, microgrids with a high proportion of renewable energy have problems such as large power supply fluctuations and poor power quality. If they are directly connected to AC power grid interconnection, the reliability and stability of the system will be greatly affected. In this paper, a Cascaded Neutral Point Clamped Three-level Converter(C-NPC) DC interconnection system scheme and control technology for island multi-energy microgrid are proposed to achieve reliable power supply, flexible multi-mode control and low-carbon stable operation of multi-energy microgrid on island or remote mountain area.Finally, taking an island interconnection project in the east coast of China as the research object, a typical system operation test is carried out to verify the good operation characteristics of the system.The research results of this paper can promote the overall utilization rate of clean energy in the island regional power grid, achieve carbon reduction, promote global carbon neutrality.The voltage source converter based high voltage dc (VSC-HVDC) transmission method for island interconnection does not require the synchronization of AC systems at both ends, and has several advantages, such as reducing the dependence of weak isolated network on standby capacity and At present, most of the island power generation systems mainly use diesel generators to meet the electricity demand of the island. This power supply mode has low energy utilization efficiency, and emits a lot of exhaust gas, causing great damage to the ecological structure and environment of the island region.

    Keywords: Island, multi-energy microgrid, DC interconnection system, flexible multi-mode control, Carbon reduction

    Received: 13 Sep 2024; Accepted: 23 Oct 2024.

    Copyright: © 2024 Liu, Wang, Liu, Bai and Du. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Xiangnan Du, NARI China-EPRI Electrical Engineering Co., Ltd., State Grid Corporation of China (SGCC), Beijing, China

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