同时计及SVG和长线路分布参数的谐波不稳定源定位研究  

Research on harmonic instability source localization considering both SVG and long transmission line distributed parameters

作　　者：邓伊扬 徐方维[1] 杨永恒 赵波 李鑫玥 陈哲 胡鹏飞[2] 梁武斌 范钰寅 DENG Yiyang;XU Fangwei;YANG Yongheng;ZHAO Bo;LI Xinyue;CHEN Zhe;HU Pengfei;LIANG Wubin;FAN Yuyin(College of Electrical Engineering,Sichuan University,Chengdu 610065,China;Zhejiang University,Hangzhou 310058,China;College of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China;State Grid Zhejiang Electric Power Company Ltd.Electric Power Research Institute,Hangzhou 310000,China;Nanjing Shuangyuan Electric Co.,Ltd.,Nanjing 211000,China)

机构地区：[1]四川大学电气工程学院,四川成都610065 [2]浙江大学,浙江杭州310058 [3]华北电力大学电气与电子工程学院,北京102206 [4]国网浙江省电力有限公司电力科学研究院,浙江杭州310000 [5]南京双元电气有限公司,江苏南京211000

出　　处：《电力系统保护与控制》2025年第6期140-149,共10页Power System Protection and Control

基　　金：国家自然科学基金面上项目资助(52277113)“新型电力系统非同步测量下多谐波溯源与责任量化关键技术研究”。

摘　　要：现有考虑线路分布参数的风电场谐波不稳定分析均未考虑静止无功发生器(static var generator,SVG)动态特性的影响。而SVG在高频段呈现负阻感特性,易与线路分布参数及其他元件发生感容耦合,导致系统发生谐波不稳定。基于此,提出一种基于泰勒近似的风电场谐波不稳定频域模态分析方法。通过求解系统频域节点导纳矩阵行列式零点判定系统稳定性,并定义节点对不稳定模式的参与因子,实现谐波不稳定中心位置定位及传递路径辨识。研究表明,SVG易与长距离输电线路和交流电网交互,导致新能源场站高频谐波进一步放大,直至发生高频谐波不稳定问题,且SVG为风电场高频谐波不稳定主导因素。最后,基于Matlab/Simulink仿真验证了所提方法的准确性。Existing studies on harmonic instability in wind farms that consider transmission line distributed parameters do not account for the dynamic characteristics of the static var generator(SVG).However,SVG exhibits negative resistance and inductance characteristics at high frequency,making it prone to inductive-capacitance coupling with transmission line distributed parameters and other components,which can lead to harmonic instability in the system.Based on this,a frequency domain modal analysis method for wind farm harmonic instability is proposed using Taylor approximation.The system stability is determined by solving the zero point of the frequency domain node admittance matrix determinant,and the node’s participation factor in the unstable mode is defined to achieve the source location of harmonic instability and identification of the transmission path.The paper reveals that an SVG tends to interact with long-distance transmission lines and AC power grids,leading to further amplification of high-frequency harmonics in renewable energy substations until high-frequency harmonic instability occurs.Moreover,an SVG is the dominant factor in high-frequency harmonic instability in wind farms.Finally,the accuracy of the proposed method is verified through Matlab/Simulink simulations.

关 键 词：分布参数 风电场 谐波不稳定 频域模态分析法 静止无功发生器 

分 类 号：TM7[电气工程—电力系统及自动化]