Datalog Design For Distributed Solar Power Systems

For distributed solar energy system, the output power is generally small-scale, within a few kilowatts, flexible to local conditions,scattered layout, independently, self-control. Photovoltaic string module clouding, contact problems or grid failures all can interfere with system performace and thus reduce yields. When the solar energy system working exception, how to rapidly fixed the field devices through remote monitoring system? How to upgrade the firmwares of these devices spreaded on a global scale by one-button remote? Which kind of faults was occurred frequently during the devices long-playing life, in order to avoid them in the development of next-generation products? How to use the monitoring system to help investors increase revenue, and reduce risk? Even a small-scale system can be vulnerable to yield losses if an error goes undetected over a long period of time, that's why continuous system monitoring is always worth your while.Remote monitoring system of the distributed solar energy systems, has been achieved far more functions than real-time data display of the field devices, faults alarm, start-up and shut-down the devices. Remote monitoring system is not only to present the comprehensive operational information of the solar energy plants simply, but also push customized reports to which connected to the Internet at anywhere anytime through the PC, smart phones, and tablets, etc., and making analysis of the download data. When the plant is abnormal, the monitoring system can send the faults to emergency phones prepared in advance automatically, which can help users to make a quick response to solve problems. System maintenance staffs can quickly and easily get all the plant running record. By analyzing the record, they can find the problems and fix them. The whole process is implemented remotely. In many cases, this can avoid the long-distance trip, waste of time and costly on-site service.The data acquisition device, usually called data logger, is in the middle layer in remote monitoring system, it is responsible to upload the field devices running data which is collected by RS485 communication port to the remote web servers, meanwhile, download the operation command which is received from a remote client to a field device, it is the key point of the "cloud" ideas and business models. Unfortunately, Data logger on the market today can not support active power derating, and reactive power compensation that is required in the European EEG 2012, VDE-AR-N 4105 and BDEW standards, no system clock synchronization, and less field communication interfaces, on-site monitoring methods and Intenet access measures not flexible enough, and the cost is too high to some cost-sensitive applications.High-performance features Datalogger, which is designed here, is not only a data logger, but also to achieve the standard requirements by EEG 2012, VDE-AR-N 4105 and BDEW. In addition to upload & download functions, it has three RS485 wired communication interfaces, and self-networking Zigbee wireless for option, supports customized communication protocols which can monitor a variety of products from different manufacturers. Thanks to data logger SNTP, the entire distributed solar system clock skew can be maintained within 50 milliseconds. It is equipped with GPRS. If there is an Internet access interface nearby the Datalog, the users can choose a ordinary wired way to access the Internet, for remote desert areas and some of the less accessible parts where the wired network can not inaccessible, the users can access the Internet through the GPRS.