毕业设计（论文）-基于USB的电力谐波数据采集系统精选.doc

基于USB的电力谐波数据采集系统 摘要：电力是人们生活越来越不可缺少的一种能源，但是随着非线性负载在电力系统中的增加，使得电力系统受到的谐波污染日趋严重。电力谐波带来的危害，既影响电网中接连设备的寿命，也影响电网的自身安全。针对电力谐波进行研究，找到防治办法是非常重要的，防治的首要前提就是及时正确的获取谐波数据。 本文针对要获取的电力谐波数据进行了分析，提出了基于USB的数据采集方案，并比较了基于传统总线的数据采集方式。随后，对USB的体系结构进行了深入的分析，结合电力谐波数据采集的特点，详细地介绍了系统的硬件设计和软件开发。其中，硬件部分完成了传感器的选择，A/D转换器的选择，并选择了Cypress公司的CY7C68013-56pin芯片为作为接口的核心芯片。在对上述传感器和芯片作了详细地介绍后，也给出了系统的硬件设计电路，包括A/D转换器与接口芯片的连接设计，电源转换电路的设计等，并对电路的PCB制作提出了工艺要求。在软件部分，详细阐述了CY7C68013在固件控制下，进行的数据采集和传输，文中还介绍了USB的驱动程序设计过程，以及上位机管理程序的设计，最后，完成了一个用USB对电力谐波信号的进行采集的完整系统。 在数据采集系统中应用USB总线技术不仅实现了数据的采集、传输和保存数据的功能，并且使系统具有了即插即用的特点。 关键词:电力谐波，数据采集，USB，固件，驱动程序 Power harmonic data acquisition system Based on USB Abstract: Electricity is an essential source of energy for peoples lives.With increase of the non-linear loads in power system,harmonics pollution of the power system is growing.Harm of power harmonics is very great.Not only affects the life of power equipment in the grid,but also affects the grids own security.To study the power harmonic so as to find the way of control is very important.To get the data of harmonic is the primary prerequisite for prevention. Through analysis of the data acquisition,the program of data acquisition based on USB was put forward in the paper,and compare with the traditional bus-based data acquisition program.Then,the architecture of the USB was deeply analysed.According as the features of power harmonic data acquisition,the detailed hardware and software design was introduced.In the hardware section,choice of sensor and A/D converter was introduced,and With the CY7C68013-56pin chip of Cypress Company as the core for the entire data acquisition system based on USB is designed.The sensor and chip were introduced detailed.Hardware design is completed,including design of A/D converter and interface chip connection,and design of power conversion circuits,etc.The technology of PCB process was required.In the software part,the data collection and transmission were controlled by firmware in