摘要
从电力部门运行和管理的角度出发,提出利用负荷的非线性特性定位谐波源及划分谐波责任的方法。该方法通过建立负荷时域等值模型,在不知道系统侧和用户侧负荷参数的情况下,利用公共连接点(PCC)上电压、电流的物理关系建立微分方程,求解负荷等值阻抗参数。根据辨识的负荷等值阻抗参数定位谐波源。采用奇异值分解(SVD)方法对采样的电压、电流数据进行分析,克服测量噪声及量测矩阵奇异的影响,提高参数辨识的精度。应用量化的负荷非线性度,进一步区分各谐波源的谐波责任。仿真表明,该方法简单可行,可准确定位谐波源,且不受背景谐波的影响。
In the perspective of the electricity sector,a method of using load nonlinearity characteristics to identify harmonic sources and assign the responsibility of all the harmonics is proposed.By developing the load time domain equivalent model,with no knowledge of the load parameters on the system side and user side,differential equations are derived using the physical relationship between voltage and current on the point of common coupling（PCC） to solve the load equivalent impedance parameters.The harmonic sources are located according to the load equivalent impedance parameters identified.The singular value decomposition（SVD） method is adopted to analyze the sample voltage and current data,overcome the impact of measurement noise and the measurement matrix singularity,and improve the accuracy of parameter identification.Furthermore,quantified load non-linearity is used to further distinguish between the responsibilities of all harmonic sources.Simulation results show that the method proposed is simple and efficient,and capable of accurately locating harmonic sources while free from background harmonic influence.
出处
《电力系统自动化》
EI
CSCD
北大核心
2012年第1期96-100,共5页
Automation of Electric Power Systems
关键词
谐波源
奇异值分解
微分方程
负荷等值阻抗参数
负荷非线性度
电能质量
harmonic source
singular value decomposition（SVD）
differential equation
loads equivalent impedance parameters
load non-linearity
power quality
