电能质量检测算法研究及FPGA系统装置设计

发布时间：2018-05-15 19:49

本文选题：凯瑟窗 + 四谱线插值　；参考：《哈尔滨理工大学》2017年硕士论文

【摘要】：电能质量一直都是人们关注的焦点,每次硬件条件的发展或者是软件算法的更新,都伴随着人们对电能质量检测装置的改进,因为随着科学技术的发展,人们对电子产品的依赖性越来越大,电子产品对电能质量的敏感性较强,随之电能质量的要求也越来越高,对多功能,精度和实时性高的电能质量检测装置的需求也越来越大。本文首先对电能质量谐波检测方法和当前电能质量检测装置的研究现状进行了研究,根据当前使用快速傅里叶变换进行谐波检测时,由于达不到整周期的定点采样,会出现频谱泄露和栅栏效应等影响谐波检测精度的问题,提出了采样硬件锁相同步电路,根据采样信号频率的波动,实时的进行同步锁存,触发采样,达到整周期定点采样的效果。同时在谐波检测算法上提出了基于凯瑟窗的四谱线插值FFT电力谐波分析算法,充分的利用了凯瑟窗函数能够随意改变主旁瓣之间的能量比重的优点,同时在传统二谱线与三谱线插值的基础上提出了四谱线插值,进一步提高了谐波计算的精度,并对基于凯瑟窗的四谱线插值算法进行了仿真测试。在硬件平台的设计上,本装置采用了FPGA作为主控制芯片,外围电路包括电压互感器、电流互感器与滤波电路等组成的前置信号调理电路,模数采集转换电路等。在片上FPGA来实现对AD采样的控制,并对采集的数据利用片上ROM进行加窗函数处理,利用FFT IP核进行快速傅里叶变换。并在FPGA上嵌入Nios II处理器,进行对数据的进一步处理,最后通过以太网络传输到上位机进行显示,实现对电能质量进行远程检测的目的。论文最后对本系统装置进行了实验测试,实验结果表明,能够实现对电能质量基本参数的高精度检测的要求。
[Abstract]:Power quality has always been the focus of attention, every time the development of hardware conditions or software algorithm update, along with the improvement of power quality detection devices, because with the development of science and technology, People rely more and more on electronic products, electronic products are more sensitive to power quality, and the requirements of power quality are becoming higher and higher, and the demand for multi-functional, accurate and real-time power quality detection devices is also increasing. In this paper, the methods of harmonic detection of power quality and the current research status of power quality detection device are studied. According to the current use of fast Fourier transform for harmonic detection, because of the failure to achieve the whole period of fixed point sampling, Problems such as spectrum leakage and fence effect will affect the accuracy of harmonic detection. This paper puts forward the sampling hardware phase-locked synchronization circuit. According to the frequency fluctuation of the sampling signal, real-time synchronous latching is carried out to trigger the sampling. The effect of whole period fixed point sampling is achieved. At the same time, a four-line interpolation FFT power harmonic analysis algorithm based on the Cather window is proposed, which makes full use of the advantage of the Cather window function which can change the energy proportion between the main sidelobe at will. At the same time, based on the traditional interpolation of two and three spectral lines, a four-spectral line interpolation is proposed to further improve the accuracy of harmonic calculation, and a simulation test of the four-spectral line interpolation algorithm based on the Cather window is carried out. In the design of hardware platform, FPGA is used as the main control chip. The peripheral circuits include voltage transformer, current transformer and filter circuit, signal conditioning circuit, A / D acquisition and conversion circuit and so on. The control of AD sampling is realized by FPGA on chip, and the data collected is processed by windowing function by ROM on chip, and fast Fourier transform by FFT IP core. The Nios II processor is embedded in the FPGA to further process the data. Finally, the data is transmitted to the host computer to display through the Ethernet network. The purpose of remote detection of power quality is realized. In the end of this paper, the experimental results show that the high precision detection of the basic parameters of power quality can be realized.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN791;TM930

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