张北柔直工程高频谐波振荡机理与抑制方法研究  

High Frequency Harmonic Resonance and Suppression in Zhangbei Project

作　　者：杜镇宇 阳岳希 季柯 周啸 胡应宏 DU Zhenyu;YANG Yuexi;JI Ke;ZHOU Xiao;HU Yinghong(State Key Laboratory of Advanced Power Transmission Technology(State Grid Smart Grid Research Institute Co.,Ltd.),Changping District,Beijing 102209,China;Beijing Key Laboratory of DC Grid Technology and Simulation(State Grid Smart Grid Research Institute Co.,Ltd.),Changping District,Beijing 102209,China;Electric Power Research Institute of State Grid JiBei Electric Power Co.,Ltd.,Xicheng District,Beijing 100045,China)

机构地区：[1]先进输电技术国家重点实验室(国网智能电网研究院有限公司),北京市昌平区102209 [2]直流电网技术与仿真北京市重点实验室(国网智能电网研究院有限公司),北京市昌平区102209 [3]国网冀北电力有限公司电力科学研究院,北京市西城区100045

出　　处：《电网技术》2022年第8期3066-3075,共10页Power System Technology

基　　金：国家电网有限公司科技项目“柔直电网模块化电压源换流阀高次谐波机理与抑制措施”(5500-202014057A-0-0-00)。

摘　　要：张北柔性直流电网示范工程(下称“张北工程”)的投运,解决了大规模可再生能源的多点汇集和送出,实现了清洁能源发电的源网协调友好互动。2020年12月张北工程康保站向交流侧诺英线充电过程中,发生了多次1500Hz左右的高频振荡。针对该问题,该文建立了康保站换流器在高频段的简化阻抗模型,基于阻抗稳定性理论,采用伯德图对康保站换流器和交流系统的高频振荡机理进行研究,通过仿真验证了该文对振荡的分析结果与现场测试结果基本吻合。提出将基于有源滤波和无源阻尼的综合抑制策略应用于该工程。所提策略能够有效抑制高频振荡,保证换流器交流侧高频阻抗呈正阻尼特性,增强了系统在高频段的稳定性。此外,经校验无源阻尼策略基本上不影响对康保站的正常运行损耗和低频阻抗特性。The commissioning of Zhangbei voltage source converter-based DC Grid Demonstration Project(hereinafter referred to "Zhangbei Project") has solved the problems of multi-point convergence and transmission of the large-scale renewable energy resources, realizing the coordinated and friendly interaction between the sources and the networks with the clean energy generation. In December 2020, several high-frequency resonances of around 1500 Hz occurred during the open line charging process of the Kangbao station to the AC side. To address this problem, this paper firstly establishes a simplified impedance model of the Kangbao converter station for the high frequency band. Based on the impedance stability theory, the mechanism of high frequency resonances of the converter and AC system of Kangbao station is studied by using the Bode plot, and the analysis results based on simulations are basically consistent with the field records. A comprehensive suppression strategy based on active filtering and passive damper is proposed to be applied to the project and the high frequency resonance can be effectively damped. The application of this strategy would help improve the AC side impedance of the Kangbao converter with positive damping characteristics in the high frequency band. In addition, the passive dampers are demonstrated with little impact on the system losses and impedance characteristics of the Kangbao converter station in the low frequency band.

关 键 词：柔性直流电网 高频谐振 阻抗稳定性 有源滤波 无源阻尼 

分 类 号：TM721[电气工程—电力系统及自动化]