电力系统自动化2024，Vol.48Issue(16)：154-164,11.DOI:10.7500/AEPS20231116001
采用高低阀接线的嵌套型MMC拓扑及其直流故障穿越策略
Topology and DC Fault Ride-through Strategy of Embedded Modular Multilevel Converter with High-/low-voltage Valve Connection
摘要
Abstract
In the ultra-high-voltage and long-distance DC transmission system using the half-bridge modular multilevel converter(MMC)with high-/low-voltage valve connection,the ultra-high-voltage DC circuit breakers required for fault clearance are immature and costly.Aiming at the above problems,this paper proposes an embedded MMC topology with high-/low-voltage valve connection.According to the basic principle of full-bridge sub-module operation,an external embedded bridge arm and an internal embedded energy transfer branch are designed to reverse the voltage polarity of the MMC with the high-voltage valve.The converter station of the half-bridge MMC can realize the non-blocking DC fault ride-through with a lower cost than that of the hybrid MMC.Based on the switching sequence of each branch and the switching time of different devices during fault clearing,the fault ride-through control strategy is designed.By analyzing the current and voltage stress of the device in each stage,the basis for device selection and number configuration is given.Finally,the effectiveness of the proposed control strategy is verified by PSCAD/EMTDC simulations.The device cost and operation loss of the proposed strategy are compared with the existing MMC schemes,which shows the proposed strategy is more economical.关键词
柔性直流输电/模块化多电平换流器/故障穿越/故障等效模型Key words
flexible DC transmission/modular multilevel converter(MMC)/fault ride-through/fault equivalent model引用本文复制引用
张紫如,付丰豪,赵西贝,贾秀芳..采用高低阀接线的嵌套型MMC拓扑及其直流故障穿越策略[J].电力系统自动化,2024,48(16):154-164,11.基金项目
国家自然科学基金资助项目(52307097). This work supported by National Natural Science Foundation of China(No.52307097). （52307097）
