直驱风电场经MMC-HVDC并网送端系统稳定性分析及振荡抑制  

Stability Analysis and Oscillation Suppression at Sending End of Direct-drive Wind Farm Integration System via MMC-HVDC

作　　者：曾瑞 雷鸣[1] 王一振 何晋伟[1] ZENG Rui;LEI Ming;WANG Yizhen;HE Jinwei(Key Laboratory of Smart Grid of Ministry of Education,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学智能电网教育部重点实验室,天津300072

出　　处：《电力系统及其自动化学报》2024年第2期26-35,共10页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(52377119,U22B20109)。

摘　　要：基于模块化多电平换流器MMC(modular multilevel converter)的高压直流输电HVDC(high voltage direct current transmission)因具有无源网络支撑等优势而被广泛应用于大容量新能源外送消纳。受电力电子设备交互作用等因素影响,送端系统易发生振荡失稳现象。首先,建立了直驱风电场经MMC-HVDC并网送端系统的小扰动线性化模型,分析了风场有功输出对系统稳定性的影响。然后,建立了MMC及风机并网变流器交流侧dq阻抗模型,从阻抗角度揭示了送端系统振荡失稳机理。进一步,提出了基于MMC交流电压控制外环q轴附加阻尼的振荡抑制策略,可满足系统满功率范围内的运行稳定性要求。最后,基于全比例模型的仿真结果验证了所提振荡抑制策略的有效性。High voltage direct current transmission(HVDC)based on modular multilevel converters(MMCs)is widely appliedtothe transmission and consumptionof large-capacity renewable energyowing to its advantages such as passive network supply.Due to the impact of factors including the interaction between power electronic devices,the sending end system is prone to oscillation and instability.First,the small disturbance linearized model of the sending end of di⁃rect-drive wind farm integration system via MMC-HVDC is established,and the impact of active power output from the wind farmon the system stability is analyzed.Then,the AC-side dq impedance model of MMC and wind generator gridconnected converters is established,and the mechanism of oscillation instability at the sending end system is revealed from the perspective of impedance.Furthermore,an oscillation suppression strategy based on additional dampingat⁃tached to the outer loop q axis of the MMC AC voltage controller is proposed,which can meet the operational stability re⁃quirements within the full power range of the system.Finally,the simulation results based on a full-scale model verify the effectiveness of the proposed oscillation suppressionstrategy.

关 键 词：直驱风场 MMC-HVDC 稳定性分析 振荡抑制 

分 类 号：TM72[电气工程—电力系统及自动化]