基于时滞稳定裕度的柔性直流系统高频稳定性分析  

High-frequency Stability Analysis of MMC-HVDC System Based on Delay Stability Margin

作　　者：张芳[1] 杨丰瑜 姚文鹏 ZHANG Fang;YANG Fengyu;YAO Wenpeng(Key Laboratory of Smart Grid of Ministry of Education(Tianjin University),Tianjin 300072,China)

机构地区：[1]智能电网教育部重点实验室(天津大学),天津300072

出　　处：《电力系统及其自动化学报》2022年第5期125-135,共11页Proceedings of the CSU-EPSA

摘　　要：近年来,长链路延时导致的高频振荡现象在实际柔性直流输电系统工程中频繁发生。为了探究高频振荡的产生机理及影响因素,从时滞系统小扰动稳定性的角度研究柔性直流输电系统的高频稳定性,推导建立了考虑延时的柔性直流输电系统数学模型,利用Rekasius变换直接精确求取了系统的时滞稳定裕度。基于系统的时滞稳定裕度,定量分析了内环电流和锁相环参数以及有功、无功功率变化对柔性直流输电系统高频稳定性的影响。最后,利用电磁暂态仿真模型验证了理论分析的正确性。In recent years,the phenomenon of high-frequency resonance caused by long delay has occurred frequently in practical projects of modular multilevel converter based high voltage direct current(MMC-HVDC)transmission sys⁃tem.To explore the inherent generation mechanism and influencing factors,the high-frequency stability of the MMCHVDC transmission system is studied from the perspective of small disturbance stability of a time-delayed system,and a mathematical model of the time-delayed MMC-HVDC transmission system is derived.The delay stability margin of the system is directly and accurately obtained by means of the Rekasius transform,based on which the effects of controller parameters of internal loop current and phase locked-loop and the active and reactive power variations on the high-fre⁃quency stability of the MMC-HVDC transmission system are analyzed quantitatively.Finally,an electromagnetic tran⁃sient simulation model is built to verify the theoretical analysis.

关 键 词：柔性直流输电系统 高频振荡 时滞系统 时滞稳定裕度 Rekasius变换 

分 类 号：TM712[电气工程—电力系统及自动化]