基于DSP的谐波检测系统研究

发布时间：2018-08-30 07:31

【摘要】：随着节能技术和电力电子技术的推广,各种非线性电力电子装置如变流设备、变频设备等的使用日益增多,其对电力系统的影响是产生了大量的电力谐波。谐波严重降低电能质量,如任由其发展则会破坏整个电网的安全稳定运行。因此,对谐波问题的解决迫在眉睫,而谐波检测是解决谐波问题的基础。由于电力系统具有各种不同类型的谐波源而导致各次谐波的产生,如果能在控制之前对各次谐波的时频特性进行清晰的掌握,则会大大降低控制难度,提高治理效果,同时也能将谐波清晰的展现在人们面前。针对这一问题本论文研究设计了一套基于TMS320F28335的包含谐波检测仪与上位机的谐波检测系统,实现对谐波准确、实时、稳定的检测。本论文首先分析了谐波产生的原因以及危害,分析了国内外在谐波检测方面的研究现状以及未来的发展趋势。以此为基础,分析比较了FFT、小波变换以及小波包变换的优劣,最后提出了FFT联合小波包变换的谐波检测算法,实现了对信号准确、快速的处理。针对复杂的运算以及实时性的要求,选择了TMS320F28335作为核心处理器。谐波检测仪能够单独实现脱机工作,记录重要数据,也能通过以太网与上位机进行通信,以太网控制芯片选择了ENC28J60。上位机以易控软件为平台开发监控界面,谐波检测仪将采集到的数据以及计算的结果通过以太网上传至上位机,并通过监控界面进行显示。上位机监控界面具有web发布功能,使得能够通过网页对远程进行访问,同时能将数据存储在自身数据库内,方便后来分析调用。最后,对系统进行了功能性实验与稳定性实验,证明系统符合国标要求,能够实现检测的准确性与快速性,并且能持续稳定运行。
[Abstract]:With the popularization of energy-saving technology and power electronics technology, a variety of nonlinear power electronic devices, such as converter equipment, frequency conversion equipment and so on, are increasingly used. The influence of these devices on power system is to produce a large number of power harmonics. Harmonic seriously reduces the power quality, if it is allowed to develop, it will destroy the safe and stable operation of the whole power grid. Therefore, it is urgent to solve the harmonic problem, and harmonic detection is the basis to solve the harmonic problem. Because the power system has various kinds of harmonic sources, the generation of each harmonic is caused. If the time-frequency characteristics of the harmonics can be clearly grasped before the control, the difficulty of control will be greatly reduced and the treatment effect will be improved. At the same time, the harmonics can also be clearly displayed in front of people. In order to solve this problem, this paper designs a harmonic detection system based on TMS320F28335, which includes harmonic detector and host computer, which can detect harmonics accurately, realtime and stably. In this paper, the reason and harm of harmonic generation are analyzed, and the research status and future development trend of harmonic detection at home and abroad are analyzed. On this basis, the advantages and disadvantages of FFT, wavelet transform and wavelet packet transform are analyzed and compared. Finally, the harmonic detection algorithm of FFT combined wavelet packet transform is proposed, which realizes accurate and fast signal processing. TMS320F28335 is chosen as the core processor to meet the requirements of complex operation and real-time. The harmonic detector can work offline alone, record important data and communicate with host computer via Ethernet. Ethernet control chip chooses ENC28J60.. The monitoring interface is developed on the platform of easy control software. The harmonic detector uploads the collected data and the calculated results to the upper computer through Ethernet and displays them through the monitoring interface. The upper computer monitoring interface has the function of web publishing, which enables remote access through the web page, and can store the data in its own database, which is convenient for later analysis and call. Finally, the functional and stability experiments are carried out on the system, which proves that the system meets the requirements of national standard, can realize the accuracy and rapidity of detection, and can run steadily and continuously.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM935

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