论文总字数：19695字

摘 要

由于科技和经济的快速发展，国民生活水平日益提高，使得电力需求同样也在日益增长，这导致供电质量面临着与以往不同的挑战，其中，不间断性以及稳定性尤为重要。为了确保供电的安全，需要采取许多重要的手段，定期巡视便是其中之一。但是，对于一些偏僻地区，人工巡视的可行性并不高，输电线路中的安全隐患不能被及时的发现以及纠正。再加上这些年来，自然灾害的增多，输电线路频繁的被侵袭，使得线路严重损害，制约了电力系统大发展，从而影响了居民供电及社会生产。所以，电力监测仪的设计与实现就变得至关重要。

以往工业控制计算机系统的软件功能主要是通过软件编程来实现。但是，软件编程的工作量很大，软件的通用性又不好，很容易发生错误。随着工业控制要求的提高，MGCS组件应运而生，它是一套功能齐全的组态生成工具软件，专门用于工业控制，通用性极强，并且部分执行程序代码固定不变。另外，MCGS有许多优点，可以使用于任何系统的监控工作当中。

当今电网实时信息传递量迅速增长，通过综合自动化控制模式实现变电站的无人值守和远程控制是变电站管理的一种趋向，而通信协议是实现控制的关键部分。Modbus总线因其精致简单、通用性强的结构、成熟的第三方标准测试软件以及较低的成本，使得Modbus协议越来越受到众多电力设备厂家的支持。通过Modbus协议能很简单使不同厂家的不同设备实现交互处理或者操作，进行统一的监控管理，因此，Modbus协议将在电力行业或系统中得到越来越深入、广泛的应用。

关键字：电力监测、Modbus协议、MCGS组态软件

The Design of The electric power monitor based on MODBUS communication protocol

Abstract

With the fast development of science and technology and economy, national life level unceasing enhancement, cause the power demand is also growing increasingly, this makes the power supply quality of the power sector face different challenges, among them, the stability and no discontinuity is particularly important. In order to ensure the safety of the power factor, must take a number of important means, and regularly patrol is one of them. But for some remote areas, the feasibility of artificial patrol is low, the safety problems in transmission lines cannot be timely discover and correct. And in recent years, natural disasters, transmission lines were raided, frequently lead to serious damage of line power system development was restricted, which affect the residents power and social production. So, the design and implementation of electric power monitor becomes crucial.

Previous industrial control computer system software function mainly depends on the software programming. However，The software programming have a large workload, and have poor generality.

Due to the improvement of industrial control, MGCS component arises at the historic moment; it is fully functional configuration generation tool software, specifically for industrial control, strong commonality, and the fixed part of the executable program code. The MCGS has many advantages, can be used for any monitoring system.

Modern power grid real-time information transfer quantity increases rapidly, through integrated automation control mode to realize the unattended substation and the remote control is a trend of substation management, and communication protocol is the key to realize control. Modbus protocol is more and more is supported by many electrical equipment manufacturers because of its general, delicate and simple structure, mature third-party standard testing software and low cost. Through the Modbus protocol can easily make different manufacturers of equipment to achieve interactive processing or operation, make unified monitoring and management, therefore, the Modbus protocol in electric power industry or get more and more in-depth and extensive application in the system.

目录

摘要 I

Abstract II

第一章 绪论 - 1 -

1.1课题研究背景及意义 - 1 -

1.2国内外研究现状 - 2 -

第二章 MCGS组态软件 - 4 -

2.1 MCGS组态软件介绍 - 4 -

2.2 MCGS组态软件常用术语 - 5 -

2.3 MCGS的基本功能和主要特点 - 6 -

2.4 MCGS的工作方式 - 7 -

2.4.1 MCGS如何与设备进行通讯 - 7 -

2.4.2 MCGS如何产生动画效果 - 7 -

2.4.3 MCGS如何实施远程多机监控 - 8 -

2.4.4 如何对工程运行流程实施有效控制 - 8 -

第三章 MCGS组态软件界面设计 - 9 -

3.1 主界面设计 - 9 -

3.2主控操作界面设计 - 11 -

3.3 状态查询界面 - 12 -

3.4谐波数据查询界面设计 - 14 -

3.5电压电流曲线界面设计 - 16 -

3.6数值设定界面设计 - 17 -

第四章 MCGS组态软件逻辑关系建立 - 18 -

4.1 建立模块连接 - 18 -

4.2变量设定 - 19 -

4.3主界面时间显示 - 20 -

4.4功能键简要设计 - 22 -

第五章 Modbus协议 - 23 -

5.1 modbus 通讯协议概述 - 23 -

5.1.1 地址（Address）域 - 23 -

5.1.2 功能(Function)域 - 23 -

5.1.3 数据(Data)域 - 24 -

5.1.4 错误校验(Check)域 - 24 -

5.2 MODBUS协议的通讯格式 - 24 -

5.2.1 ASCII模式 - 24 -

5.2.2 RTU模式 - 25 -

5.3 Modbus 数据单元 - 25 -

5.4 Modbus标准功能码 - 25 -

5.5 Modbus通信原理 - 26 -

5.6 统一的标准 - 27 -

5.7 Modbus通信透明性 - 28 -

5.8 Modbus协议在电力系统中的应用 - 28 -

第六章 通讯功能的具体实现 - 30 -

6.1 样机简介 - 30 -

6.2 DSP到触摸屏的通讯 - 30 -

6.3 触摸屏到DSP的通讯 - 33 -

第七章 结束语 - 36 -

参考文献 - 37 -

致谢 - 38 -

第一章 绪论

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