构网型柔直并网系统受扰特性分析及稳定控制策略  

Disturbed characteristics analysis and stability control strategy of MMC-HVDC grid-connected system with GFM-MMC

作　　者：郑超 苏志达 吕思卓 ZHENG Chao;SU Zhida;LÜSizhuo(China Electric Power Research Institute Co.,Ltd.,Beijing 100192,China)

机构地区：[1]中国电力科学研究院有限公司,北京100192

出　　处：《电力自动化设备》2025年第4期125-132,共8页Electric Power Automation Equipment

基　　金：国家电网有限公司总部科技项目(5100-202255370A-2-0-ZN)。

摘　　要：当前针对构网型变流器并网系统的研究多基于电磁暂态尺度,模型和控制结构复杂,受仿真规模和效率的限制,无法适用于大型电力系统暂态稳定分析。面向送端采用跟网型控制和受端采用构网型控制的双端柔直并网系统,建立了计及变流器限流策略的构网型柔直并网系统机电暂态仿真模型;采用大扰动激励法揭示了构网型柔直并网系统非线性功率响应特性,分析了故障限流倍数、扰动幅度、系统强度等因素对系统暂态特性的影响;从装备级和系统级层面,提出了改善构网型柔直并网系统暂态功角稳定性的控制策略。针对含构网型柔直的新英格兰10机39节点交直流混联系统,仿真验证了所提多级稳定控制策略提升系统功角稳定水平的有效性。Current research on grid-forming converter grid-connected system is mostly based on electromagnetic transient scale,the model and control structure are complex,which is unable to be applied to largescale power system transient stability analysis because of the limitation of simulation scale and efficiency.The electromechanical transient simulation model of two-terminal modular multilevel converter based high voltage direct current transmission(MMC-HVDC)grid-connected system considering converter current limiting strategy is established,which is composed of grid-following MMC converter at sending end and gridforming MMC converter at the receiving end.The nonlinear power response characteristics of MMC-HVDC grid-connect systems are revealed by using large disturbance excitation method,as well as the effects of the overcurrent multiple,disturbance amplitude and system strength on transient characteristics are analyzed.From the perspective of equipment-level and system-level,a control strategy to improve the transient power angle stability of MMC-HVDC grid-connected is proposed.The effectiveness of the proposed multilevel stability control strategy to improve rotor angle stability is verified in New England 10-machine 39-bus AC/DC hybrid system with GFM-MMC.

关 键 词：构网型控制 双端柔直 功角稳定 受扰暂态特性 控制策略 

分 类 号：TM46[电气工程—电器] TM721.1