【作者】 宋鑫；

【导师】 吕玉祥；

【作者基本信息】 太原理工大学 ， 物理电子学， 2010， 硕士

【摘要】 随着大量非线性负荷和冲击性负荷对电网扰动的加剧以及电力用户对电能质量要求的提高,电能质量问题得到了越来越广泛的重视。一方面,电能作为一种商品其质量需要得到保证,另一方面,电力用户对电网的干扰也要限制在一定范围内。电力用户作为电能质量问题的受害者同时也可能是电能质量问题的制造者,因此,广泛获取电力用户的电能质量实时监测数据,对于评估电能质量水平、确认干扰源和进一步改善电能质量非常必要。本文研究与设计了一种基于TMS320F2812的电能质量监测系统,系统利用高速DSP实时测量、保存相关数据,将采集的数据通过串行通信传输到上位机进行分析,为优质供电提供了保证。论文首先介绍了电能质量监测系统的发展历程,概述了电能质量问题的背景,较为全面的论及了电能质量问题的现象。从有关标准入手,研究了电能质量监测的各种分析方法;重点设计了基于DSP的新型电能质量监测装置的整体硬件结构原理图和电路图,同时设计了软件主流程图和各部分功能的子程序流程图,最后分析了干扰电能质量监测装置产生的原因以及提出的相应措施,并对未来电能质量监测系统的研究做了简单的展望。本装置采用TI公司的TMS320F2812作为中央处理器,根据系统的要求及相关的国家标准对电能质量参数实时测量。在本课题中,主要进行了以下方面的研究:1、在理论上,通过分析电能质量国家标准,得到系统所需的监测参数。在保证精度的前提下,利用DSP的高计算能力结合相关算法分析处理数据。2、在硬件上,以TMS320F2812为控制计算中心,选择了高精度16位的ADS8364 A/D转换器,并设计A/D转换输入信号的预处理电路,数据存储部分是在DSP上开发的外设存储器,并在DSP上开发了串行通信接口RS-232,能及时把现场数据传输到上位机。最后设计完成了整个电路,结合系统软件,实现了整个系统的设计。经检测,所设计的电能质量监测测量速度和精度,功能都优于市场同类产品。更多还原

【Abstract】 With the exacerbation of power grid disturbance caused by the large number of non-linear load and stroken load, and the improvement of requirements which power users request to the power quality, power quality problems become more and more widely appreciated. On the one hand, electricity as a commodity needs assure its quality; on the other hand, power users have to limit the interference of the power grid within a certain range. Power users as victims of power quality problems also maybe the manufacturer of power quality problems. Therefore, broad access to real-time monitoring power quality data of electricity users is essential to assess the level of power quality, confirm the source of interference and improve the power quality further.In this paper, power quality monitoring system based digital signal processor (DSP) is designed.Powerful computing function of DSP can monitor power quality online, measure and store the real-time data and analyze the data after being transmitted to PC through serial communication, all of this provide an accurate the quality of power. Firstly the paper introduces the development process of power quality monitoring system, outlining the background of power quality problems and discussing the phenomenon of power quality problems fully. Various analytical methods of the power quality monitoring are studied according to the related standard. The overall hardware schematic and circuit diagrams of new power quality monitoring device based DSP is designed, and the main software flow chart and each subroutine is also provided. Finally, the reason of disturbing power quality monitoring device is analyzed and appropriate measures are proposed, and the trend of the future of power quality monitoring system is described.This device uses TMS320F2812 made by TI as the system CPU, and the parameters of power quality are measured according to de requirement of systerm and the related national standards. The following key technologies is studied in the paper:1. In theory, after analyzing the national standards of power qulity,the necessary parameters is obtained . Under the premise of ensuring accuracy, the data is analysed using the high computation ability of DSP and related algorithm;2. In hardware, systerm chooses TMS320F2812 as the CPU, a high-precision 16-bit ADS8364 as A / D the converter, input signal preprocessing circuit of A/D is designed; the peripheral memory on DSP is used as the data storage. Serial communication interface RS-232 is also developed on DSP which can transmite data to the PC.Finally the whole system circuit is finished, which realized all design of systerm with the software .After the examination function of the systerm such as the measurement of precision and speed is superior to similar products in the market.更多还原