LIN Jintian;NI Xiaojun;QIU Peng;

• 1:State Grid Zhejiang Electric Power Research Institute

Abstract：

Flexible low frequency AC transmission is a novel power transmission technology that uses switchoff power electronic devices and modular multilevel topology. Having the advantages of both power frequency AC transmission and VSC-HVDC, the technology has attracted wide attention in such related research fields as long-distance power transmission, offshore wind power transmission and urban power grid. Based on the detailed introduction of the basic working principles and system structure of flexible low-frequency AC transmission, the technical characteristics and the application research status in related fields of flexible low-frequency AC transmission are summarized. Finally, the paper looks to the key technologies that need to be focused on of flexible low-frequency AC transmission technology, especially system integration technology,main circuit topology of frequency converter, control and protection system, harmonic and power quality analysis, and low-frequency adaptability of the main equipment.

Key Words： flexible low-frequency AC transmission;modular multilevel frequency converter;AC-AC frequency conversion;offshore wind power;urban power grid

Abstract:

Keywords:

Foundation: 国家电网有限公司科技项目（5200-201919266A-0-0-00）

Authors: LIN Jintian;NI Xiaojun;QIU Peng;

DOI: 10.19585/j.zjdl.202110005

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