摘要
随着数字化时代的到来和TCP/IP网络的迅猛发展,对传输电力远动报文可靠性要求不断提高。同时以以太网为传输媒介传输的IEC104规约将会替代目前其它规约,广泛应用在电力远动领域。为满足电力远动部门对IEC104规约监控和维护的基本要求,众多针对监控与测试包括IEC104等多种电力远动规约运行状况的解决方案应运而生。
本文介绍了目前国内外常用电力远动规约的技术与特点,重点分析了IEC104远动规约部分,并总结了IEC104在应用中的优势。在研究远动测试技术基础上,结合嵌入式软件技术,提出了一种性价比更高的产品设计方案,开发出了手持式的电力远动测试仪系统。
首先在研究单片机嵌入式应用技术基础上,设计了主从CPU芯片的接口电路结构图、中断系统模块、系统存储区管理模块以及整个系统软件的架构。
其次基于以太网通信技术,对电力远动规约测试的重要功能模块需求进行了分析,同时详细地分析了IEC104规约报文在远动装置主从站间等的实现过程。
最后分别在上下位软件以及主从芯片间分别采用USB与RS-232通信设计,并编写了传输协议实现通信。在开发过程中对串行通信的可靠及准确性进行了多次的实验调试与验证。
产品在投放到市场后销售成绩显著表明,本手持式测试仪表系统能很好地满足了电力运营商的要求。此外,针对各种具体问题,本文还以讨论的形式介绍了关于今后系统设计的一些改进想法和措施,比如基于虚拟仪器技术的电力远动规约无缝测试。
With digital era coming and rapid development of TCP/IP, higher reliability is demanded by telecontrol telegrams transmission gradually. Meanwhile, IEC104 protocol based on Ethernet network tends to take the place of other protocols. In order to meet the requirement of power administration section for the monitor and maintenance of IEC104 protocol, there has been created lots of solution to the monitor and testing including IEC104 protocol, and so on.
This thesis introduces technologies and characters for common power telecontrol protocol home and abroad, especially on IEC104 section. Then a conclusion is made on advantages of application for it. Based on the study of telecontrol testing technology and combining with embedded software technology, a higher quality-to-price ratio solution is proposed and a handheld power telecontrol testing system is developed.
Firstly, on the basis of study of single chip application in embedded system, master/slave CPU interface circuit, interruption system module, system storage management module and software holistic structure have been designed.
Secondly, through utilizing Ethernet communication technology, the requirements of main function modules are analyzed for power telecontrol protocol testing, and the processing of IEC104 protocol telegrams based on Ethernet was described in detail.
Finally, USB technologies are adopted between PC software and firmware and RS-232 serial communication for master/slave CPU. Moreover, transmission protocol is programmed to realize communication. The most important thing is that reliability and exactitude for serial communication have been debugged and validated many times during the development.
The remarkable sale results indicate that the handheld testing system is applicable for practicable use and content with power operator. In addition, in terms of kinds of practical problems, this thesis introduces some ideas and measures of improvement in the form of discussion, for example, power telecontrol protocol seamless testing based on virtual instrument technology.
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