基于TMS320F2812的电能质量监测系统的数据采集模块

基于TMS320F2812的电能质量监测系统的数据采集模块

摘要

电能质量监测系统，其定义为收集数据上的电压和电流，并发送到某处有用的数据，并且要将这些数据变换成决策信息。数据采集模块使用外部16位A / D转换芯片来完成模拟和数字转换，针对电压和电流信号，对这些信号进行分析。由于传统的电能质量监测系统的不足之处，本文提出了一种基于TMS320F2812的电能质量监测的新方法。该系统的DSP芯片强大的数据处理能力和系统资源被得以运用，来将同步采样信号进行处理，并且，电能质量的5项指标也继而被分析和存储。实验结果告诉我们，TMS320F2812是满足实时性要求的，可以快速，准确地反映电力系统电能质量指标的变化。因此，该系统很好地适应了电力系统的电能质量监测的要求。ADS8364芯片的功能和原理也在本设计中给出介绍。此外，还给出了ADS8364同TMS320F2812的接口电路和TMS320F2812的最小系统设计。最后，给出了采样系统的软件设计。其中重点设计了初始化和中断程序。

关键词：电能质量监测，数据采集模块，TMS320F2812，ADS8364，模数转换

DESIGN ON DATA ACQUISITION MODULE OF SYSTEM FOR POWER QUALITY MONITORING BASED ON DSP

TMS320F2812

ABSTRACT

System for Power quality monitoring is a process which collects data about voltage and electric current, sends it to somewhere in need of it and transforms those data into information decision-making. Its data acquisition module, using external 16-bit analog-digital converter, accomplishes analog-digital conversion of voltage and electric current signals and at the same time, analyses these signals. Because of the shortcoming of the traditional monitoring systems of power quality, this article advances a new monitoring method of power quality which is based on TMS320F2812. The system makes use of the powerful data- processing capability and the wealth of system resources of DSP to process the sampled signals. Thereby the system can analyze and display the five targets of the power quality. The results of the experiment show that the speed of TMS320F2812 processing data can satisfy the requirement of the online monitoring. The system can reflect the changes of each power quality target quickly and accurately. Therefore, the system can be well adapted to the power quality monitoring requirements. This design introduces the trait and principle of the ADS8364 and shows interface circuit between ADS8364 and TMS320F2812，and besides,it displays the minimum system of TMS320F2812.In the end,this design provides software design of acquisition system,which emphasizes initialization and interrupt programs.

Key words:power quality monitoring, data acquisition module, TMS320F2812, ADS8364, analog-digital conversion

目 录

1 绪论 .............................................................................................................................................. 4

1.1基于TMS320F2812的电能质量监测系统的背景，目的与意义 ................................... 4

1.2.1电压偏差 .................................................................................................................. 5

1.2.2电压波动与闪变 ...................................................................................................... 5

1.2.3频率偏差 .................................................................................................................. 5

1.2.5三相电压不平衡 ...................................................................................................... 5

1.2.6电网频率 ................................................................................................................. 5

1.2.7公用电网谐波 ........................................................................................................ 6

1.3 电能质量监测系统的数据采集模块 ................................................................................ 6

2 采样系统的硬件设计 ................................................................................................................... 8

2.1 ADS8364芯片的特性 ........................................................................................................ 8

2.2 TMS320F2812的介绍 ....................................................................................................... 9

2.2.1 TMs320F2812的结构 ............................................................................................. 9

2.2.2 TMS320F2812的性能 ............................................................................................ 9

2.3 ADS8364与TMS320F2812的接口电路 ........................................................................ 10

2.3.1 TMS320F2812的最小系统设计 .......................................................................... 10

2.3.2 ADS8364的接口设计 ........................................................................................... 12

2.3.3 ADC的初始化操作............................................................................................... 13

3 采样系统的软件设计 ................................................................................................................. 13

3.1 采样系统的软件设计流程 .............................................................................................. 13

3.2 采样系统的软件程序设计 .............................................................................................. 14

3.2.1 PWM波形原理 ..................................................................................................... 14

3.2.2初始化及控制程序 ................................................................................................ 16

3.2.3 主程序及中断程序 ............................................................................................... 18

4 结论 ............................................................................................................................................ 19

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