基于改进偏最小二乘法的系统谐波阻抗及谐波发射水平估算  

Assessing harmonic impedance and the harmonic emission level based on improved partial least-squares regression method

作　　者：李丽[1] 马宏忠[2] 姜宁[3] 王春宁[3] 李俊[4] 

机构地区：[1]福建电力职业技术学院电力系,福建泉州362000 [2]河海大学电气工程学院,江苏南京210098 [3]江苏省电力公司南京供电公司,江苏南京210008 [4]江苏省电力公司东台供电公司,江苏盐城224231

出　　处：《电力系统保护与控制》2011年第1期92-95,131,共5页Power System Protection and Control

基　　金：国家自然科学基金资助项目(50477010);中国水利水电科学研究院开放研究基金~~

摘　　要：提出了用改进的偏最小二乘回归法估算供电系统谐波阻抗的方法。对公共点采样的电压和电流信号进行快速傅里叶变换,得出各次谐波电压和电流分别作为回归方程的因变量和自变量,以系统侧阻抗为回归系数,利用改进的偏最小二乘法求解出回归系数即为系统侧阻抗。该方法克服了传统偏最小二乘法可能漏选有用成分的缺陷。仿真及实例结果验证了利用改进偏最小二乘法估算系统侧谐波阻抗和用户侧谐波发射水平的有效性。An improved partial least-squares regression method is used for assessing harmonic impedance of power supply system.Through processing the voltage and current sampling signals in PCC with fast Fourier transform,the harmonic voltage and current which are respectively taken as the dependent variable and the independent variable of the regression equation are obtained,then,an improved partial least-squares regression is used to solve the regression coefficient which is the system-side impedance.This method overcomes the defect of partial least-squares regression method that may omit the useful elements.Simulation results and examples prove that it is effective to assess harmonic impedance and the harmonic emission of customer-side level using the improved partial least-squares regression method.

关 键 词：谐波 改进的偏最小二乘回归 谐波阻抗 回归系数 

分 类 号：TM711[电气工程—电力系统及自动化]