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间谐波检测系统的软件设计
摘要
电力系统间谐波的在线检测是电能质量研究领域的前沿技术和一门热门研究课题。本文针对电力间谐波检测的这一核心问题,利用快速傅立叶变换理论、插值理论、双峰谱线修正理论,对间谐波的定义、间谐波的来源、间谐波的检测、电力间谐波检测装置的软件设计等方面进行了深入的研究。
根据电力系统中间谐波的特点,基于双峰谱线修正理论,本文提出了一种新的算法——消去法来进行间谐波检测。该方法使用加窗插值的FFT进行谐波参量的检测,然后在时域中消去谐波分量,这样就可以很好的减少对间谐波的频谱泄漏,而且不必几十个周期的检测间谐波,从而可以提高计算的实时性。
对间谐波进行检测使用消去法能得到更好的准确性,此方法在DSP中很容易实现,而且适合于在线快速检测装置中的应用。本文采用并联型有源滤波器对谐波电流进行补偿,具有很好的动态补偿特性,并通过Simulink仿真进行了验证。
关键词:间谐波在线检测加窗插值
Abstract
The on-line detection of harmonic and inter-harmonic in a power system is cutting-edge technology and a hot research topic in power quality research area. In this paper, Aiming at the core problem of inter-harmonic detection, using the theory of fast Fourier transform, interpolation theory, bimodal spectrum amendment theory, make deep research on the definition inter-harmonic , the sources of inter-harmonic, inter-harmonic detection, the software design of power inter-harmonic detect systems.
According to the characteristics of inter-harmonics in the power system , based on the bimodal spectrum amendment theory ,this paper proposed a new algorithm “elimination method” for inter-harmonic method uses the windowed interpolation FFT detect harmonic parameters, and then eliminate ponents in the time domain, so it can reduce inter-harmonic spectral leakage very well, and also do not have dozens of inter-harmonic detection cycle, reducing the sampling period, which can improve the real-time calculation.
Elimination method to detect inter-harmonics can get better accuracy. This method is easy to implement in DSP, and is suitable for applications in the online rapid detection device. In this paper, we chose the parallel type active power filter for harmonic pensation function, it has the very good pensation characteristic, and then we verified by simulating simulation.
Keywords:inter- harmonic;Line—detection;Add window Interpolation
引言
目前,随着电力电子技术的快速发展,间谐波问题逐渐成为一个人们广泛关注的研究课题,已经吸引了人们的广泛的注意力。一方面为了提高生产率与自动化水平,越来越多的用户采用了带有微处理器和功率电子器件等