低压配电系统单相非线性负荷的谐波衰减效应研究  

Investigation on the Harmonic Attenuation Effect of Single-phase Nonlinear Loads in Low Voltage Distribution System

作　　者：雍静[1] 娄方桥[1] 王一平[1] 晏小龙[1] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400030

出　　处：《中国电机工程学报》2011年第13期55-62,共8页Proceedings of the CSEE

基　　金：重庆市自然科学基金项目(2009BB3032)~~

摘　　要：对单相不可控电容滤波整流型电路的仿真和实验研究表明,低压配电系统非线性负荷的谐波特性与电压波形畸变程度相关;提出用电压波形的波峰系数(crest factor)作为非线性负荷谐波电流的衰减效应(attenuation effect)的衡量指标,波峰系数与非线性负荷的谐波发生水平之间具有线性递增关系。分析还表明,在民用低压配电系统中,非线性负荷谐波电流几乎均使其供电端电压呈现平顶波峰的趋势。这一结论与实测电压大部分呈现平顶波一致;同时说明,导致低压系统供电电压畸变的主要因素就是系统中大量存在的分布式谐波源。Simulation and experimental studies on single-phase capacitor-filtered diode bridge rectifier circuit were performed. The results show that the harmonic characteristics of nonlinear loads in low voltage distribution system are correlated to harmonic distortion of supply voltages. The voltage crest factor was proposed as the index in this paper to estimate the attenuation effect. The relationship between harmonics generated by nonlinear loads and the voltage crest factors is linearly incremental. Harmonic characteristic analysis for nonlinear loads in residential power system implied that almost all of the harmonic currents of nonlinear loads intend to flatten their supply voltage waveforms. This conclusion is also verified by measured voltage waveforms. Furthermore, it indicates that the main factor causing supply-voltage distortion is the installation of the massive distributed harmonic sources in distribution system.

关 键 词：配电系统 非线性负荷 谐波特性 波峰系数 衰减效应 

分 类 号：TM72[电气工程—电力系统及自动化]