直流等值阻抗扫描改进方法研究  

Research on Improved Method of DC Equivalent Impedance Scanning

作　　者：罗澍忻 李猛 彭勃 李作红 刘若平 LUO Shuxin;LI Meng;PENG Bo;LI Zuohong;LIU Ruoping(Grid Planning&Research Center of Guangdong Power Grid Corporation,Guangzhou 510080,China)

机构地区：[1]广东电网有限责任公司电网规划研究中心,广东广州510080

出　　处：《电工技术》2021年第20期140-142,共3页Electric Engineering

摘　　要：交直流混联电网中的谐波不稳定问题日益突出,对电网运行安全产生了隐患,而谐波阻抗扫描是分析谐波谐振风险的重要手段。因此,梳理了直流等值阻抗的定义,推导并验证了适用于直流阻抗扫描的测试信号法,分析了直流阻抗扫描影响因素,通过仿真分析与总结,验证了谐波源参数选择是造成直流阻抗扫描差异的主要原因,并提出参数选择及扫描方法改进建议。The problem of harmonic instability in the AC/DC hybrid power grid is becoming more and more prominent,which had hidden dangers to the safety of power grid operation.The harmonic impedance scan is an important means to analyze the risk of harmonic resonance.Therefore,the definition of DC equivalent impedance is summarized,the test signal method suitable for DC impedance scanning is deduced and verified,and the various influencing factors of DC impedance scanning are analyzed.Through simulation analysis and summary,it is verified that the selection of harmonic source parameters is the main reason for the difference of DC impedance scanning,and suggestions for parameter selection and improvement of scanning method are provided.

关 键 词：交直流混联电网 谐波谐振 阻抗扫描 测试信号法 谐波源参数 

分 类 号：TM72[电气工程—电力系统及自动化]