滑窗迭代DFT检测谐波和无功电流的新算法  

New Method of Harmonic and Reactive Current Detection Based on Sliding-window Iteration DFT

作　　者：张杰成[1] 乔鸣忠[1] 朱鹏[1] 马战毅 杜承东 

机构地区：[1]海军工程大学电气工程学院,武汉430033 [2]海军驻上海沪东中华造船有限公司军事代表室,上海201206

出　　处：《电力系统及其自动化学报》2015年第12期18-22,共5页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(51007094)

摘　　要：针对现阶段谐波和无功检测方法计算量大、存在低通滤波环节等不足,提出了一种检测谐波和无功电流的新方法。该方法首先进行坐标变换,然后利用基波正序电压实时相位参与滑窗迭代计算,直接得到基波正序有功电流,不需要坐标反变换、幅值和相角计算,减小了计算量。根据电力系统中偶次谐波和离散傅里叶变换的特性,证明了半周期傅里叶变换的可行性。同时对不同步采样导致的幅值误差进行了修正。仿真结果表明,该谐波检测方法稳态精度高,动态性能好,抗干扰能力强。To avoid the shortages of the current harmonic and reactive current detection methods of active power filter that the computation is complex and the low-pass filtering is needed,a new method based on sliding-window iterative algorithm of discrete fourier transform is proposed for harmonic and reactive current detection. After the coordinate transformation,the algorithm utilizes the real-time phase of the fundamental positive sequence voltage to calculate the fundamental positive sequence active current. In this algorithm,the inverse coordinate transformation,amplitude and phase angle calculation are not required. According to the characteristics of even order harmonic in power system and characteristics of discrete Fourier transform,the feasibility of half cycle Fourier transform was proved. And the errors caused by non-synchronous sampling are corrected. Simulation results indicate that the method has the high stable precision,fast dynamic response,and strong anti-nterference ability.

关 键 词：谐波检测 滑窗迭代 坐标变换 半周期 

分 类 号：TM714[电气工程—电力系统及自动化]