基于时域准同步的谐波和间谐波检测算法  

Harmonic and interharmonic detection algorithm based on time-domain quasi-synchronous technique

作　　者：王彭[1] 周峰[1] 黄震宇[1] 赵春宇[1] 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《仪器仪表学报》2013年第2期275-280,共6页Chinese Journal of Scientific Instrument

摘　　要：傅里叶分析法因其简单方便成为常用的谐波、间谐波检测方法,但该方法在非同步采样时存在频谱泄露问题,由此产生的谐波和间谐波的相互干扰会严重降低测量准确性。通过采用时域准同步方法减少频谱泄漏,并采用梳状滤波器分离谐波和间谐波,可以有效提高谐波和间谐波的检测精度。在电能质量测量实时性要求高的场合,为了避免梳状滤波器导致的长时延,可以通过引入时域平均法在时延较小情况下获得相当的间谐波测量精度。给出该方法在电力谐波、间谐波测量方面应用的算法流程,并分别在MATLAB和谐波分析仪上实现谐波、间谐波分析算例。Generally,Fourier analysis is used to detect harmonic and interharmonic because of its simplicity and convenience. However, spectrum leakage problem exists in this method when the sampling is asynchronous, which leads to the interaction of harmonic and interharmonic and decreases the detection accuracy seriously. Time domain quasisynchronous sampling technique is applied to reduce the spectrum leakage, comb filter is used to separate harmonic and interharmonic, and the detection precision can be improved effectively. In the situation where highly real-time power quality detection is required, the combination of comb filter and time-domain averaging is proposed to avoid the long time delay caused by comb filter; and using this method the same interharmonic detection aceuracy ean be achieved with smaller time delay. The flowchart of this algorithm in the application of power harmonic and interharmonic detection is provided in this paper. Meanwhile, harmonic and interharmonic analysis examples are realized on MATLAB platform and a harmonic analyzer.

关 键 词：谐波 间谐波 准同步 梳状滤波器 时域平均 

分 类 号：TN911.6[电子电信—通信与信息系统] TH74[电子电信—信息与通信工程]