电力载波在光伏微逆变器分布式发电监控系统中的应用研究

发布时间：2018-02-04 07:44

本文关键词： 光伏微逆变器分布式发电系统电力线载波通信监控系统　出处：《华南理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：光伏微逆变器分布式发电系统中单台微逆变器的工作异常可能对整个分布式发电系统产生不良影响，降低整体发电效率；并且当微逆变器发生故障时，希望能快速定位到该微逆变器，进行故障排除。因此，设计光伏微逆变器分布式发电监控系统，监控每台光伏微逆变器的工作参数和整个光伏微逆变器分布式发电系统的整体运行参数，以便防止、查找和分析发电系统中的故障，，这对光伏并网发电的发展和电网电压的稳定具有重要意义。本文分析了光伏微逆变器分布式发电监控系统的国内外发展现状；研究了光伏微逆变器分布式发电系统的特点；提出了集电力线载波通信系统、能源管理单元中转站和上位机监控平台一体的监控系统方案。研究了电力线载波通信方式的原理，分析比较了各种载波调制方式的优缺点，选择基于FSK+DSSS调制的电力线载波模块，并针对此模块设计了相应的耦合电路。提出了能源管理单元EMU的设计方案，并对关键元件的参数进行设计和选型。通过能源管理单元进行分布式发电监控系统的数据中转，并实现光伏微逆变器分布式发电系统与上位机的数据传输。开发了基于.NET平台、C#语言的PC上位机监控平台，设计了良好的人机操作界面，方面用户查看和操作；建立了全面的历史数据库系统，有利于系统故障的分析和科学研究，也为以后系统的改进和优化提供了有价值的参考数据。建立了光伏微逆变器分布式发电模拟系统、能源管理单元和PC上位机监控系统的测试平台。对电力线载波通信模块和能源管理单元的信号传输可靠性和实时性、上位机功能进行了测试。试验表明：研制的能源管理单元与电力线载波模块传输质量良好，上位机能实时监控光伏微逆变器分布式发电系统的整体运行参数和每台微逆变器的工作参数，并生成报表，建立历史数据库。
[Abstract]:The abnormal operation of single micro inverter in the distributed photovoltaic microinverter system may have a negative impact on the whole distributed generation system and reduce the overall generation efficiency. And when the micro-inverter fails, it is hoped that the micro-inverter can be quickly located and troubleshooting. Therefore, a distributed photovoltaic micro-inverter generation monitoring system is designed. Monitoring the operating parameters of each photovoltaic microinverter and the overall operating parameters of the whole distributed photovoltaic micro-inverter generation system, in order to prevent, find and analyze the fault in the generation system. This is of great significance to the development of photovoltaic grid-connected generation and the stability of grid voltage. This paper analyzes the status quo of the distributed generation monitoring system for photovoltaic microinverters at home and abroad. The characteristics of photovoltaic micro-inverter distributed generation system are studied. This paper presents a monitoring system which integrates the power line carrier communication system, the energy management unit transfer station and the host computer monitoring platform. This paper studies the principle of power line carrier communication, analyzes and compares the advantages and disadvantages of various carrier modulation methods, and selects the power line carrier module based on FSK DSSS modulation. The corresponding coupling circuit is designed for this module. The design scheme of energy management unit (EMU) is put forward, and the parameters of key components are designed and selected. The data transfer of distributed generation monitoring system is carried out through the energy management unit. The data transmission between the distributed generation system of photovoltaic microinverters and the upper computer is realized. The PC monitor and control platform based on. Net platform C # is developed, and a good man-machine interface is designed, which can be viewed and operated by users. A comprehensive historical database system is established, which is conducive to the analysis and scientific research of system failures, and provides valuable reference data for the improvement and optimization of the system in the future. The distributed generation simulation system of photovoltaic microinverters is established. The test platform of energy management unit and PC monitor system. The signal transmission reliability and real-time of power line carrier communication module and energy management unit. The function of the upper computer is tested. The experiment shows that the transmission quality of the energy management unit and the power line carrier module is good. The whole operating parameters of distributed photovoltaic microinverters and the working parameters of each microinverter are monitored by the upper function in real time. The report forms are generated and the historical database is established.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464;TP277

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