Photovoltaic (Pv) Grid System For Remote Monitoring Technology Research And Design

In today’s world, coal, oil and other fossil energy dries again and again,theenvironmental pollution is more and more serious.And solar energy as the mostpotential renewable green energy,because of its reserves limitless, the universality ofthe existence of sex and clean, practical economy, more and more people place favour.Vigorously develop the pv industry, actively develop the solar energy, in the globalscope to enjoy unprecedented attention, already became the various countries’sustainable development strategy important component. Pv industry also called solarcell industry, it is using sun energy level semiconductor electronic device sun radiantenergy absorption, and the conversion to electricity industry.Recently,the photovoltaic(PV) system constantly develops with the tendency of lower cost, higher efficiencyand higher power density techniques，following the higher and higher performancerequirement of key equalizer equipments．The main application of solar energy willbe the grid-connected photovoltaic system．Generally, the grid-connected PV systems are composed of solar PV panels,inverters and AC controllers and other components. In order to ensure that every partof system works well, there are a lot of parameters which need to measure, preserve,analyze and control. As we all know, the operating data is very important for the dailymanagement, equipment maintenance, and future research and analysis of powerplant systems. Moreover, solar power is generally in marginal areas and covers anarea larger, so it’s very inconvenient and difficult to acquire the status data without acentralized platform. Therefore, it becomes significantly important to use the remotemonitoring technology for real-time monitoring PV system.This thesis addresses how to effectively real-time remote monitor thephotovoltaic power system, and the main contents are as follows:Firstly, proposed and designed a unified platform for the monitoring andmanagement of PV system with unified operation monitoring and centralizedmanagement of data. With a good partition of the hardware and software, and fullintegration of existing technologies, the platform not only simplifies the design and implementation complexity, but also has strong flexibility and scalability.Secondly, implemented a remote monitoring system based on RS485andInternet, including the design of communication gateway for data transmission,hardware design part analyses the PV module and environment front acquisitionmodule, software design part analyses the RS485communication module of threemodules: interrupt receiving procedures, command frame processing procedures anddata sending application.The system uses RS485to interconnect the control terminals(such as photovoltaic array) with On-site monitoring unit (OMU), and the OMUconnects remote monitoring center (RMC) by the Internet. This method is simple andeasy control, low cost, but subject to regional restrictions.Thirdly, designed a remote monitoring system based on the Zigbee network.From Zigbee wireless monitoring system and design idea of function requirement, thedesign of the hardware and software, expecting the components of the process and theanalysis. hardware design part is also key PV module and environment analysis frontacquisition module, software design part analyses the coordinator software and nodesoftware. which uses Zigbee to interconnect the control terminals (such asphotovoltaic array) with OMU，and the OMU connects remote monitoring center(RMC) via GPRS communication. This system is very scalable and flexible, but thecost is higher.