摘要
在新能源远距离、大容量的外送需求下,以模块化多电平换流器(Modular Multilevel Converter, MMC)为核心的柔性高压直流(High Voltage Direct-current, HVDC)输电技术在我国得到快速发展,并逐步与传统高压交流电网深度融合,形成高度电力电子化的交直流混联电力系统。相比于传统交流电网,MMC等电力电子设备显著拓宽了混联系统的响应带宽,加剧了电网设备之间的交互作用,并在已投运的HVDC工程中频繁引发数赫兹至数千赫兹的宽频振荡,严重影响供电安全。数学建模与稳定性分析成为保障交直流混联电力系统稳定运行的迫切需求。文中对MMC的数学建模与分析方法进行归纳与总结,为交直流混联系统的宽频振荡研究提供参考。
Under the demand of long-distance and large-capacity delivery of new energy,the flexible high voltage direct-current,(HVDC)transmission technology with modular multilevel converter,(MMC)as the core has been rapidly developed in China,and gradually deeply integrated with the traditional high voltage AC power grid to form a highly electronic AC-DC hybrid power system.However,compared with the traditional AC power grid,MMC and other power electronic devices significantly broaden the response bandwidth of the series-parallel system,aggravate the interaction between power grid devices,and frequently cause broadband oscillation from several Hz to several thousand Hz in HVDC projects that have been put into operation,which seriously affects the power supply safety.Modeling and stability analysis have become the key requirement in AC-DC hybrid power system.In this paper,the methods of mathematical modeling and model simplification of MMC are summarized,which provides reference value for future mathematical modeling technology of MMC.
作者
徐梓高
杨桂森
刘瑜超
李彬彬
XU Zigao;Yang Guisen;LIU Yuchao;LI Binbin(School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 100096;College of Intelligent Science and Engineering,Harbin Engineering University,Harbin Heilongjiang 150001;School of Electrical Engineering&Automation,Harbin Institute of Technology,Harbin Heilongjiang 150001)
出处
《东北电力大学学报》
2023年第6期8-16,共9页
Journal of Northeast Electric Power University
基金
国家自然科学基金(52107084)
中央高校基本科研业务费专项资金资助(2023MS001)。
关键词
模块化多电平换流器
宽频振荡
阻抗建模
模型简化
稳定性分析
Modular multilevel converter
Wideband oscillation
Impedance modeling
Model simplification
Stability analysis
