山东电力技术2025，Vol.52Issue(7)：44-53,10.DOI:10.20097/j.cnki.issn1007-9904.2025.07.005
面向MMC-HVDC换流站的构网型和跟网型控制无缝切换技术
Seamless Switching Method Between Grid-forming and Grid-following Control for MMC-HVDC Converter Stations
摘要
Abstract
The establishment of the dual-carbon goal has promoted the rapid development of renewable energies.The access of large-scale power electronic equipment makes the power grid present a low inertia characteristic.Flexible DC transmission systems based on the modular multilevel converter(MMC)can provide inertia support for the new energy system by using virtual synchronous generator(VSG)control to simulate the mechanical characteristics of synchronous generators in the scenario of connecting to a weak grid.This can provide inertia support for the new energy system.To satisfy different working conditions,the converter station needs to switch between two control modes,including grid-forming control and grid-following control.In this paper,a seamless switching technique between grid-forming and grid-following control is proposed for MMC-HVDC converter stations.Without modifying the inner-loop current control,a unified outer-loop reference current is constructed for both control modes,ensuring continuity of the output voltage's phase angle and amplitude during the switching process.Simulation results show that the proposed seamless switching technique can effectively reduce the impact on the system caused by the control switching process.关键词
构网型/跟网型/虚拟同步机/柔性直流输电/模块化多电平变换器Key words
grid-forming/grid-following/virtual synchronous generator/HVDC/modular multilevel converter分类
信息技术与安全科学引用本文复制引用
孙孔明,李宽,冯忆文,张远实..面向MMC-HVDC换流站的构网型和跟网型控制无缝切换技术[J].山东电力技术,2025,52(7):44-53,10.基金项目
国网山东省电力公司电力科学研究院自主研发项目"应对新能源并网的柔直逆变站主动支撑控制技术研究项目"(ZY-2024-02). Independent Research and Development Project of State Grid Shandong Electric Power Research Institute"Research Project on Active Support Control Technology for Flexible DC Inverter Stations in Response to the Grid-connection of New Energy"(ZY-2024-02). （ZY-2024-02）
