Design And Realization Of Remote Monitoring&Control Equipment For Stand-alone Photovoltaic Power Generation System

As development in technology and economic, and as improvement of people’s living standards,electric energy is applied in lots of basal facility such as equipment for communications, finance andtransportation, so more and more energy sources are consumed. Recent years, more an more problemsemergence, such as greenhouse effect, energy conjuncture, leakage of Japan Fukushima nuclear energysources and the like. Thus people attach more importance to continuable development of electricindustry. Under the trend of new energy power generation, solar power has been greatly promoted.In many remote area of China, powered photovoltaic power systems are used in small electricalfacilities. These systems are mostly stand-alone photovoltaic systems, which are monitored to ensure thepower supply safety.In this thesis, we take the need of pint-sized photovoltaic devices management and evaluation intoaccount. These devices are used in island’s lighthouse, beacons, mountains (or high) highway toll station,charging stations, in remote areas of the posts, radar stations, the original forest management, nursingstations, railway crossings. As independent photovoltaic power generation system considered as theapplication context, long-range monitoring instrument is designed in this paper.Monitoring device, which is made up of long-range system and local system, can monitor andcontrol the photovoltaic cells, batteries and DC/DC. Long-range monitoring system is carried out bynormal PC, while local system is made up of master control unit, control circuitry and remote datatransmission device. Master control unit, which is composed of PC104+bus computer and its expansioncard, is used as the interface of the system. And the RS-485bus meshwork is made up of Master controlunit, control circuitry and remote data transmission device. Control circuitry is made up of sun-trackingcontrol circuit and charge and discharge control circuit. Sun-tracking control circuit, which controls therotation of the battery bracket, maintains battery bracket vertical to the sunlight, so maximum solar inputis obtained. Charge and discharge control circuit, which is mainly used for storage battery chargingcontrol, can realize maximum power point tracking (MPPT). Remote data transmission unit isimplemented with a GPRS communication module.Interface, which is mainly composed of local and remote interface, is used for monitoring real-timedata, displaying historical data, review alarm, and setting the parameter. In order to ensure the dataupdated real-time and readability of the program, software is designed by using multithreading andmodularization.In this thesis, the collectivity design is brought forward, software and hardware are designed anddebugged, the running result of local and remote interface is received. By experiment, the feasibility of the design is validated.