柔性直流输电系统的高频谐波保护方法与工程实践  

High-frequency Harmonic Protection Methods and Engineering Practice for Flexible DC Transmission Systems

作　　者：姜崇学 马秀达 邹强[1] 徐莹 卢亚军 程骁[1] JIANG Chongxue;MA Xiuda;ZOU Qiang;XU Ying;LU Yajun;CHENG Xiao(NR Electric Co.,Ltd.,Nanjing 211102,China;State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏省南京市211102 [2]国网经济技术研究院有限公司,北京市102209

出　　处：《电力系统自动化》2024年第3期150-158,共9页Automation of Electric Power Systems

基　　金：国家电网公司科技项目(5108-202218280A-2-281-XG)。

摘　　要：柔性直流输电系统受电力电子设备本身特性以及控制系统影响,在多种运行工况下易出现不同频率的振荡问题。作为实现设备安全和电网稳定运行的决定因素,保护系统应实现对系统谐波的准确监测以及可靠动作。根据高频振荡时的电流能量累积作用,给出了基于反时限动作的电流类谐波保护算法。基于高频谐波电压特性,分别给出了过零点监测保护算法、谐波畸变率保护算法以及宽谐波保护算法,各保护算法相互配合,实现对不同电压振荡类型的全面保护。最后,给出了国内柔性直流工程实践中配置的高频谐波保护,结合保护原理对系统发生高频振荡后的动作特性进行分析,验证了高频谐波保护的有效性和准确性。The flexible DC transmission system is susceptible to oscillations with different frequencies under various operation conditions due to the impact of the characteristics of power electronic equipment and control systems.As a determining factor for achieving equipment safety and stable operation of the power grid,the protection system should achieve accurate monitoring of system harmonics and reliable operation.Based on the cumulative effect of current energy during the high-frequency oscillation,a current-type harmonic protection algorithm based on inverse time action is proposed.Based on the characteristics of high-frequency harmonic voltage,the zero-crossing monitoring protection algorithm,the harmonic distortion rate protection algorithm,and the high-frequency harmonic protection algorithm are provided.Each protection algorithm cooperates with each other to achieve comprehensive protection for different voltage oscillation types.Finally,the high-frequency harmonic protection configured in domestic flexible DC engineering practice is presented,and the operation characteristics of the system after high-frequency oscillation are analyzed based on the protection principle,verifying the effectiveness and accuracy of high-frequency harmonic protection.

关 键 词：柔性直流输电 高频振荡 谐波保护 过零点检测 谐波畸变率 

分 类 号：TM721.1[电气工程—电力系统及自动化]