对称性和波动性约束的居民负荷谐波发射水平评估  

Assessment on Harmonic Emission Level of Residential Loads with Symmetry and Volatility Constraints

作　　者：张华赢 朱明星[2] 时亨通 汪清 李鸿鑫 高敏 ZHANG Huaying;ZHU Mingxing;SHI Hengtong;WANG Qing;LI Hongxin;GAO Min(Shenzhen Power Supply Co.,Ltd.,Shenzhen 518000,China;School of Electrical Engineering and Automation,Anhui University,Hefei 230601,China)

机构地区：[1]深圳供电局有限公司,广东深圳518000 [2]安徽大学电气工程与自动化学院,安徽合肥230601

出　　处：《中国电力》2020年第11期60-68,共9页Electric Power

基　　金：深圳供电局有限公司科技项目(090000KK52180063)。

摘　　要：背景谐波或三相谐波不平衡均会影响居民负荷谐波发射水平评估的准确性。基于诺顿和戴维南定理,构建了谐波发射水平评估模型,分析了波动量法在居民负荷配电网谐波阻抗估算中存在的问题及三相不平衡对系统谐波阻抗估算的影响机理,提出了融合谐波主序特性提取和波动系数筛选的系统谐波阻抗估算方法,探索了负荷谐波阻抗等效方法及其估算误差对谐波发射水平估算的影响。仿真和工程应用结果均表明,采用对称性和波动性约束后,估算的系统谐波阻抗95%置信区间显著收敛,谐波发射水平评估结果更加准确。The accuracy of harmonic emission level assessment of residential loads is affected by background harmonics or threephase harmonic unbalance.Based on Norton’s and Davinan’s theorem,a model is constructed for assessment of harmonic emission level.An analysis is carried out on the problems of fluctuation method applied in harmonic impedance estimation of residential load distribution network and the influence mechanism of three-phase unbalance on the system harmonic impedance estimation.A system harmonic impedance estimation method is proposed by combining the harmonic main sequence characteristic extraction and the selection of fluctuation coefficient.The equivalent method of load harmonic impedance and the influence of its estimation error on the calculation of harmonic emission level are discussed.The results of simulation and engineering application show that the 95% confidence interval of the estimated harmonic impedance converges significantly,and the assessment result of harmonic emission level is more accurate.

关 键 词：主序特性 波动系数 阻抗估算 谐波发射水平 波动量法 

分 类 号：TM711[电气工程—电力系统及自动化]