摘要
针对用户负荷的非线性度与其谐波发射水平呈正比关系的特点,从谐波产生的角度出发克服系统侧背景谐波干扰,提出了一种基于单相和三相不平衡负荷的非线性度NLD(Non-linearity Degree)探测配电网中谐波源的新方法。基于用户负荷的时域等值模型,对实际测量到公共连接点处PCC(point of common coupling)电压和电流值经傅立叶变换消除噪声影响后,用对称分量法分解出各序分量,对各序分量求取非线性度,根据负荷总非线性度辨识出配电网中谐波源。通过对实际工程验证,证明了该方法的有效性和准确性,为合理高效治理谐波污染提供了重要依据。
The detection of harmonic sources in distribution network is a key to control harmonic pollution effectively. This paper proposes an algorithm that can calculate the nonlinear degree of single-phase and unbalanced three-phase loads to identify the harmonic source in distribution network based on the theory that the harmonic emission lever is in proportion to non-linearity degree （NLD） of the load. Through the harmonic equivalent load model in time domain, the algorithm firstly makes Fourier transform on the voltage and current data collected at the point of common coupling （PCC） to eliminate noise and decomposes sequence components by symmetrical component method, then calculates the load non-linearity degree of each component, finally judges whether the load is a harmonic source or not according to the load nonlinear degree. The results of field test show that the load non-linearity degree method is able to detect the harmonic source correctly in the actual applications.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第8期30-34,共5页
Power System Protection and Control
基金
四川省应用基础研究项目(2008JY0043-2)~~
关键词
谐波
主要谐波源
谐波源探测
非线性度法
harmonic： main harmonic source
harmonic source detecting
non-linearity degree method
