基于同步相关滤波技术的谐波检测方法研究

为实现有源滤波装置补偿电流的准确、实时跟踪,电流的实时检测是关键。传统的各种谐波检测方法特性各不相同,但它们都仅适用于电压基准比较明确场合。将基于频谱搬移原理的同步相关滤波技术应用于电力系统谐波检测,并借助于多分辨率分析思想和小波分析概念得到了一种降采样频率方法以适应谐波频率变化的情况,即自适应同步相关滤波。以交交变频器输出谐波为例,用Matlab软件仿真。仿真结果表明,这种自适应谐波检测技术可有效解决电压基准变化时的谐波检测的难题,同时为谐波抑制的实施奠定了基础。

A Harmonic Measuring Approach Based on Synchronous Filter Correlation Technology

To guarantee the correctness and a real-time tracing of active power filter device, the implementation of current real-time detecting is of great importance, The characteristics of traditional harmonic detection vary, but they are only adaptive to a clear voltage reference. Synchronous filter correlation technology based on spectrum modification is applied to harmonic detection of power system, a method of reducing sample frequency is obtained to adapt to the variation of harmonic frequency with the help of mnlti-resolution analysis and wavelet analysis concept-self-adaptive synchronous correlation filter. Take AC-AC converter for example, Matlab simulation software is used. The result shows that this self-adaptive harmonic detection technology can effectively resolve the problem of harmonic detecting under voltage reference variation. At the same time, it lays a foundation for the implementation of harmonic suppression.