摘要
准确评估公共连接点处的背景谐波电压和等效谐波阻抗是研究谐波责任分摊问题的前提。为准确评估背景谐波电压波动情况下受关注谐波源分摊的谐波责任,文中研究应用了部分线性核估计方法。为求解背景谐波电压,将背景谐波电压在受关注时段内的某一时刻按照泰勒级数展开,并把高阶项看做误差项,为保证求解的准确性,选取的目标函数在误差平方和最小的基础上考虑了展开时刻的有效邻域范围和各误差项所占权重不同对估计的影响,并利用窗宽参数控制展开时刻的邻域范围和对应误差项所占权重的大小。利用IEEE 14节点系统进行了仿真验证,并将计算结果与两种线性方法进行了比较,证明了该方法的有效性。
Estimating background harmonic voltage and equivalent harmonic impedance at the point of common coupling（PCC） is the premise of studying harmonic contribution determination.For the purpose of accurately assessing harmonic contributions of the harmonic source of concern in the case of background harmonic voltage fluctuations,the kernel estimation with the partial linear method is researched and applied.To calculate the background harmonic voltage,it is expanded in accordance with Taylor series at a certain moment in the time interval of concern.And the higher-order term is regarded as an error term. To ensure the accuracy of calculation,on the basis of the least sum of square errors,the objective function considers the effective neighborhood of the moment and the influence of different error terms for different weights and uses the bandwidth to control the range of neighborhood and the size of weight.A case study based on an IEEE 14-bus test system is conducted to show that the method is more effective in comparison with two linear methods.
出处
《电力系统自动化》
EI
CSCD
北大核心
2015年第3期63-68,共6页
Automation of Electric Power Systems
基金
教育部中央高校基本科研业务费专项资金资助项目(2014MS164)~~
关键词
电能质量
谐波责任
部分线性核估计
背景谐波电压
power quality
harmonic contributions
kernel estimation with partial linear method
background harmonic voltage
