一种改进的谐波电流检测算法  

An Improved Algorithm for Harmonic Current Detection

作　　者：林洁[1] 缑新科[1] 

机构地区：[1]兰州理工大学电气工程与信息工程学院,甘肃兰州730050

出　　处：《工矿自动化》2010年第10期42-45,共4页Journal Of Mine Automation

基　　金：甘肃省自然科学基金项目(0809RJZA006);甘肃省工业过程先进控制重点实验室项目(XJK0902)

摘　　要：针对基于瞬时无功功率理论的谐波检测算法实时性差、不能直接用于单相谐波检测的问题,提出采用滑窗迭代DFT算法来提高谐波检测的实时性;并针对传统DFT在非同步抽样时存在错误的问题,提出采用自适应抽样算法来自动调整抽样时间,从而减小DFT在非同步抽样时的计算误差。仿真结果表明,基于自适应抽样的滑窗迭代DFT算法能够实时有效地检测出谐波电流,具有很好的目标跟随性和抗干扰性。In order to solve problems that harmonic detecting algorithm based on instantaneous reactive power theory is poor in real-time performance and cannot detect single-phase harmonic directly,the paper proposed using a sliding-window iterative DFT algorithm to improve real-time performance of harmonic detection,and using self-adaptive sampling algorithm to adjust sampling time automatically so as to decrease calculating errors of FDT in non-synchronous sampling.The simulation result showed that the sliding-window iterative DFT algorithm based on self-adaptive sampling can detect harmonic current real-timely and effectively,and has excellent performances of target following and anti-interference.

关 键 词：电力有源滤波器 谐波检测 离散傅里叶变换 滑窗迭代 自适应抽样 

分 类 号：TD60[矿业工程—矿山机电] TM743[电气工程—电力系统及自动化]