柔性直流输电系统交流侧中高频谐振附加阻尼抑制措施  

Additional Damping Suppression Measures for Medium-and High-frequency Resonance on AC Side of MMC-HVDC Transmission System

作　　者：陈威 汪娟娟[1] 叶运铭 刘岳坤 冯俊杰 傅闯 CHEN Wei;WANG Juanjuan;YE Yunming;LIU Yuekun;FENG Junjie;FU Chuang(School of Electric Power,South China University of Technology,Guangzhou 510641,China;State Key Laboratory of HVDC(Electric Power Research Institute of China Southern Power Grid Company Limited),Guangzhou 510663,China)

机构地区：[1]华南理工大学电力学院,广东省广州市510641 [2]直流输电技术国家重点实验室(中国南方电网科学研究院有限责任公司),广东省广州市510663

出　　处：《电力系统自动化》2021年第18期151-161,共11页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51777079);国家自然科学基金委员会-国家电网公司智能电网联合基金资助项目(U1766213);广东省自然科学基金资助项目(2020A1515011541)。

摘　　要：中国鲁西背靠背直流异步联网工程和渝鄂直流背靠背联网工程均发生过高频谐振现象,柔性直流输电系统的链路延时是导致高频谐振现象发生的关键因素。文中针对柔性直流输电系统的中高频谐振问题,基于谐波线性化方法建立了柔性直流输电系统从交流侧端口看过去的等效详细阻抗模型,并分析了模块化多电平换流器(MMC)阻抗在中高频段呈现负阻尼特性的原因。然后,对比分析了在电压前馈环节采用低通滤波器、带阻滤波器和非线性滤波器等控制方式对MMC阻抗特性的改善作用与谐波抑制效果,并提出3种附加阻尼控制器,分析了其对MMC阻抗特性的改善作用。最后,以鲁西背靠背直流异步联网工程广西侧模型为例,通过PSCAD电磁暂态仿真验证了详细阻抗模型的正确性和附加阻尼控制的有效性。High-frequency resonance happened in both Luxi back-to-back high voltage direct current(HVDC) project and Chongqing-Hubei back-to-back HVDC project of China. The link delay of the modular multilevel converter based high voltage direct current(MMC-HVDC) transmission system is the key factor leading to high-frequency resonance. For the medium-and highfrequency resonance problems of the MMC-HVDC transmission system, this paper establishes a detailed impedance model from the AC side port of the MMC-HVDC transmission system based on the harmonic linearization method. And the reason why the impedance of MMC presents negative damping characteristics in the medium-and high-frequency bands is analyzed. Then, the improvement of impedance characteristics of MMC and the harmonic suppression effect by using the low-pass filter, the band-stop filter and the nonlinear filter in the voltage feedforward link are compared and analyzed. Meanwhile, three kinds of additional damping controllers are proposed, and their effects on improving the impedance characteristics of MMC are analyzed. Finally,taking the model for Guangxi side of Luxi back-to-back HVDC project as an example, the correctness of the detailed impedance model and the effectiveness of the additional damping control are verified by the electromagnetic transient simulation on PSCAD.

关 键 词：柔性直流输电 高频谐振 阻抗模型 电压前馈环节 附加阻尼控制 

分 类 号：TM721.1[电气工程—电力系统及自动化]