文档介绍：毕业设计(论文)
谐波和间谐波检测系统设计
摘要
电力系统谐波间谐波的在线检测是电能质量研究领域的前沿技术和热门研究课题。本文针对电力谐波间谐波检测的这一核心问题,沿着“谐波间谐波的预处理(去噪)-谐波的检测-间谐波的检测-电力谐波检测装置的设计”这一技术主线,利用快速傅立叶变换理论、插值理论、双峰谱线修正理论,对电力谐波间谐波去噪、谐波检测、间谐波检测、电力谐波装置的设计等方面进行深入研究。
根据基于加窗插值的快速傅立叶算法的误差特点,提出通过估测出电网中的基频,然后用此基频的整数倍采样频率对含有谐波的电网信号进行准同步采样,再利用快速傅立叶变换估测各谐波参数的方法。对提出的新方法进行了仿真,仿真结果能充分表明该方法的测得精度明显优于加窗插值的快速傅立叶算法,在进行准同步采样时可以减少采样周期,进一步提高了算法的实时性。同时根据电力系统间谐波的特点,基于双峰谱线修正理论,提出了一种新的算法-消去法来进行间谐波检测。对提出的新方法进行了仿真,仿真结果充分表明该方法对间谐波进行检测能得到更好的准确性。此方法容易在DSP中实现,适合在线快速检测装置中应用。
关键词:谐波;间谐波;在线检测;加窗插值
Abstract
The on-line detection of harmonic and inter·—harmonic in power system is cutting—edge technology and hot research topic in power quality research area. In this paper, harmonic power of the inter—harmonic detection core issue down”inter—harmonic,(denoising)…Harmonic, Detection…Detect,Inter-harmonics …power harmonics detection device the design of” the main line of this technology, the use of wavelet transform theory, fast Fourier transform theory, interpolation theory, bimodal spectriam amendment theory,inter-harmonic noise power’harmonics,harmonic detection,inter—harmonic detection, harmonic power device design systems.
Add a window based on Fast Fourier interpolation algorithm error characteristics of the power grid through the estimation of the fundamental frequency, and then use this integer multiple of the baseband sampling frequency of the grid containing harmonic signals Plesiochronous sampling—use Fast Fourier Transform to estimate the harmonic proposed new method of simulation,simulatio results can be adequately demonstrated that the method of measurement accuracy is better than windows add the Fast Fourier interpolation algorithm, during the quasi-synchronous sampling can be reduced when the sampling period, and further improve the algorithm real- electric power system in accordance with the characteristics of inter-harmonics, based on the bimodal spectrum of the amendment theory. proposed a new