中国电机工程学报2025，Vol.45Issue(20)：7893-7904,中插5,13.DOI:10.13334/j.0258-8013.pcsee.240812
计及调频死区的柔性直流系统频率主动支撑自适应协调控制策略
Adaptive Coordinated Control Strategy of Frequency Active Support for MMC-HVDC Systems Considering Frequency Regulation Dead Zone
摘要
Abstract
Aiming at the problems of reduced inertia level,damping,and frequency support capability caused by large-scale new energy connected to the grid through modular multilevel converter-based high voltage direct current(MMC-HVDC)transmission,a multi-time scale frequency regulation control strategy based on dead zone to realize the coordination of MMC-HVDC systems and synchronous generators is proposed,which realizes the wide-area coordination and complementarity of multi-type frequency regulation resources.In terms of inertia support,the coupling relationship between receiving-end AC grid frequency,DC voltage,and the number of modular multilevel converter(MMC)sub-modules is established.A control method for inertia support of sending-end and receiving-end MMC based on local DC voltage and frequency information is proposed respectively,whichbroadens the operating range of capacitor voltage by extending the control dimensionality.Control parameters and the adaptive recovery strategy are designed based on system safety constraints to achieve the maximum utilization of energy margin in the MMC-HVDC system.In terms of damping regulation and primary frequency regulation,an adaptive control strategy is proposed for frequency support of sending-end MMC considering frequency regulation dead zone to meet the frequency support demand under various disturbance scenarios.The dead zone is designed based on the adjustment margin of synchronous generator in receiving-end system,endowing it with the adaptive switching capability between damping regulation and primary frequency regulation.The proposed strategy realizes wide-area coordinated control of frequency support in MMC-HVDC interconnected grid under different disturbance scenarios,and reduces the range of disturbance impact while ensuring the frequency stability of the system.Finally,based on the real-time digital simulation platform,the simulation model of the MMC-HVDC system is built to verify the effectiveness of the proposed control strategy.关键词
柔性直流系统/惯量支撑/阻尼调控/一次调频/调频死区Key words
MMC-HVDC system/inertia support/damping regulation/primary frequency regulation/frequency regulation dead zone分类
信息技术与安全科学引用本文复制引用
江守其,郑双锁,李国庆,辛业春,王丽馨,王拓..计及调频死区的柔性直流系统频率主动支撑自适应协调控制策略[J].中国电机工程学报,2025,45(20):7893-7904,中插5,13.基金项目
国家自然科学基金项目(52207078,U2066208).Project Supported by National Natural Science Foundation of China(52207078,U2066208). （52207078,U2066208）
