新能源经柔直外送系统的暂态同步稳定性分析  

Transient synchronization stability analysis of renewable energy transmission via flexible HVDC system

作　　者：金国彬 杨阳[1] 辛业春 张海洋 党若峰 李玲[1] JIN Guobin;YANG Yang;XIN Yechun;ZHANG Haiyang;DANG Ruofeng;LI Ling(Laboratory of Modern Power System Simulation Control and Green Energy New Technology,Ministry of Education(Northeast Electric Power University),Jilin 132012,China)

机构地区：[1]现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林吉林132012

出　　处：《电力系统保护与控制》2025年第8期14-23,共10页Power System Protection and Control

基　　金：国家重点研发计划项目资助(2021YFB2400900);国家电网公司总部科技项目资助(5100-202399363A-2-2-ZB)。

摘　　要：针对变换器并联系统在大扰动下的暂态同步稳定性问题,当前的研究因缺乏有效的非线性动力学系统分析方法而面临着巨大挑战。为此,将新能源经柔直外送系统作为研究场景,建立系统的暂态交互模型,构造解析的李雅普诺夫函数,再利用直接法估计系统的稳定域。据此,进一步给出基于临界能量的系统暂态同步稳定判据。根据理论推导,揭示了新能源侧并网变换器和柔直送端变换器之间的耦合关系。从能量的角度分析了控制参数对同步稳定性的影响,以及控制方式对判定结果的影响。最后,在Matlab/Simulink中搭建基于模块化多电平换流器高压直流输电(modular multilevel converter based high voltage direct current transmission,MMC-HVDC)送出的新能源外送系统仿真模型,验证了所提方法的有效性和分析结果的正确性。The transient synchronization stability of converter-interfaced power systems under large disturbances presents significant challenges due to the lack of effective nonlinear dynamic system analysis methods.Therefore,taking the renewable energy transmission system via flexible HVDC system as the research scene,this paper establishes a transient interaction model of the system,constructs an analytical Lyapunov function,and estimates the stability region of the system by direct method.A critical energy-based transient synchronization stability criterion is then derived.Based on the theoretical derivation,the coupling relationship between the converters on renewable energy side and the flexible HVDC system side is revealed.From an energy perspective,the influence of control parameters on synchronization stability and the influence of control mode on stability assessment results are analyzed.Finally,a simulation model of a renewable energy transmission system based on modular multilevel converter based high voltage direct current transmission(MMC-HVDC)is developed in Matlab/Simulink to verify the effectiveness of the proposed method and the accuracy of the analysis results.

关 键 词：新能源 并网变换器 锁相环 李雅普诺夫函数 暂态同步稳定性 

分 类 号：TM721[电气工程—电力系统及自动化]