【作者】 杨鹏；

【导师】 苏士美；

【作者基本信息】 郑州大学 ， 电工理论与新技术， 2010， 硕士

【摘要】 随着电工技术的高速发展,各种新器件、新负载层出不穷,它们所产生的大量谐波对电力系统的安全造成了很大的危害,谐波问题也成为了大家日益关注的问题。因此提高针对谐波问题的检测水平,对于改善电网环境和提高电网的安全性都是十分重要的。本文首先对国内外电力谐波检测技术的发展现状作了简要介绍,又对电力谐波的基本性质及其所造成的危害作了详细阐述,对针对谐波检测的主要检测方法以及检测设备进行了概括。其次,在谐波检测方法方面针对加窗插值FFT算法进行了深入研究。研究了一种基于三项余弦窗exact-Blackman窗的三次样条插值FFT算法。分析了exact-Blackman窗的频率响应,详细推导了基于exact-Blackman窗的插值FFT算法的计算公式,从而使得新的插值FFT算法能够有效地提高电力系统谐波的测量精度。并通过MATLAB平台对此方法进行了仿真,仿真结果证明此算法能够在相对较少的采样周期内达到较高的精度,实时性好,适用于电力系统谐波检测。然后在研究了相关理论和技术的基础上,针对谐波检测对精确性以及实时性的要求,结合目前的相关技术手段,设计了一种基于DSP和ARM双CPU为核心的谐波检测装置,并详细阐述了各部分功能模块的设计,该装置能够充分发挥DSP在数据处理上的优势以及ARM在控制管理上的优势；在算法研究的基础上,设计了系统的软件部分,并将μC/OS-Ⅱ系统在ARM上进行了移植；开发了人机界面MiniGUI,使人机交互更加灵活方便。更多还原

【Abstract】 With the rapid development of electrical technology, various new devices, new load after another, they produce a lot of harmonics on power system security caused great harm, harmonic problems have become a growing concern everyone. Thereby increasing the level of detection for harmonic problems, for improving the environment and improve the power grid’s safety is very important.This article first foreign power harmonic detection technology, gave a brief introduction, but also on the power harmonics and the fundamental nature of the harm caused elaborated on the main test for the harmonic detection method and detection equipment summarized.Then, windows and interpolation FFT algorithms is in-depth study for harmonics detection methods. A window based on three cosine interpolation exact-Blackman window FFT algorithm. Discussion of the exact-Blackman window frequency response, are derived based on the exact-Blackman window FFT algorithm of interpolation formula, making the new interpolated FFT algorithm to improve power system harmonic measurement accuracy. Under the new algorithm, it takes advantage of the platform of MATLAB to develop a computer program for Simulation. Simulation results show that this new algorithms has high precision with less sampling period. It is also applicable to power system harmonics detection.And then study the theories and technologies based on the detection accuracy for harmonic and real-time requirements, combined with the current relevant technical means, a dual-CPU based on DSP and ARM core, harmonic detection device fully display DSP in the data processing on the advantages and the ARM’s superiority in the control and management in order to complete system requirements. And described in detail the various parts of the design of functional modules.In the algorithm based on the design of the software part of the system. The systemμC/OS-Ⅱmigration of the ARM part is operated. MiniGUI is developed in the system. It make people more flexible and convenient computer interaction.更多还原