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太阳能光伏电站监控系统的研究与实现
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摘要
能源是人类赖以生存的基础,目前能源危机不断加重,太阳能作为取之不尽用之不竭的可再生清洁能源越来越受到人们的重视,因此,利用光伏效应把太阳能转化为电能是解决当前危机的重要方法之一。但是,光伏发电站基本都处在偏远、环境恶劣的地方,而且地理位置分散,不易于管理,严重妨碍了光伏发电的应用推广。本文针对光伏电站的现状,应用计算机技术、网络通信技术等相关技术,研究开发了一套以现场总线为骨干的太阳能光伏电站监控系统。该系统能够同时实现本地监控和远程监控功能,具有实时性好、功能全面等特点,具有很强的工程实用价值。
     本文首先介绍了光伏发电技术及其监控系统的研究现状,阐述了光伏电站监控系统的组成和功能。根据实际应用的需求,选取了AVR ATmega系列单片机作为该系统的控制器,进行了系统的软硬件的设计,实现了对光伏电站运行状态的实时监控,具有参数显示和设置等功能。
     其次,通过比较目前常用的远程通信方式,选用了GPRS无线通信方式来实现监控系统远程通信功能。并结合GPRS无线通信方式的优点,详细阐述了系统是如何利用GPRS无线通信技术构建数据通信链路与实现数据远程传输的。
     最后,分别给出了基于MCGS的本地监控和基于WEB的远程监控人机界面设计,并详细给出了单片机与本地上位机的通信协议——Modbus-RTU。本监控系统是通过多重窗体程序来实现人机界面的,通过不同的窗体可以实现电站的运行状态的实时显示和参数设定等功能。
     在实验室搭建了系统测试平台,进行了模拟调试,达到了设计的预期效果。此系统已经在实际的工程中得到应用。
Energy is the basis for human survival. Nowadays, energy crisis is increasingly serious. Solar energy, as an inexhaustible supply, is clean and renewable. It has been paid more and more attention. Therefore, using photovoltaic effect to convert solar power to electricity is one of the important methods to solve the current crisis. However, most photovoltaic power plants are in remote, harsh regions, and disperse in different places, and also difficult to monitor. So these factors restrict the promotion of photovoltaic technology seriously. In this thesis, the PV power plant monitoring system is researched and designed based on fieldbus by using computer technology, network communication technology and related technologies. The system is able to achieve local and remote monitoring, and is very practical for its multiple functions and performance of real-time.
     Firstly, the research status of photovoltaic technology and its monitoring system was introduced in the thesis, and then the composition and function of the PV power plant monitoring system was described. According to the needs of practical application, AVR ATmega series microcontrollers were selected as the system controller in the thesis. The hardware design and software design for the controller were mainly studied, they could achieve real-time data acquisition, data and state display, parameter setting etc al.
     Secondly, by comparing with the current commonly used remote means of communication, GPRS wireless communication was chosen to achieve the remote communication, and how to use GPRS to build a data communication link and achieve remote data transmission was described in detail by combining the advantages of GPRS.
     Finally, the thesis gave the human-machine interface design based on MCGS and WEB respectively, and communication principle Modbus-RTU between the single-chip microcomputer and host computer. The human-machine interface was achieved through multiple forms program. The monitoring system achieved real-time displaying and parameter settings and other functions in different forms.
     In the laboratory, the hardware test platform was built. And by testing and debugging the system, it achieved the expected effect. In addition, this system has been applied in practical engineering.
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