| Solar energy is the most abundant resources of renewable energy. Photovoltaic technology opens up vast areas for solar energy utilization. The establishment of efficient and high-quality monitoring system for the photovoltaic power generation system is very important. Compared to nuclear power and thermal power,the location of photovoltaic power generation is remote and scattered. Now photovoltaic monitoring system doesn’t have a wide range of applications, and its degree of intelligence is not high.It’s generally displayed and controlled locally. It can’t only monitored remotely, but also can’t achieve the efficient schedule of energe and the central process of information.Combining the Integrated previous research and technology development trends, a monitoring system with a three-tier architecture is designed in this paper. Inverter module level, using TMS320F2812DSP as its processor, includes LCD displaying module, keyboard controlling module and serial communication module. Site monitoring level, that is, the level of the industrial control computer,which condut the real-time monitor of the cabinet owning some inverters; the highest level is remote monitoring level, that controls the sub-station of industrial control computers remotely, industrial control computers and remote monitoring computers make up of the upper computer monitoring system, it includes data communication module, displaying-controlling module, and data-storage module.The monitoring system is based on the Modbus protocol. The inverter and the industrial control computer communicate based on MODBUS/RTU communication protocol through RS485bus. And the industrial control level and remote monitoring level communicates based on the MODBUS/TCP communication protocol.through the EthernetBased on the above analysis, specific software implementation about the framework of the above design is conducted in this paper, then a detailed experimental test in the experimental prototype platform is carried out, and the operating status of the monitoring system proves the practicality and reliability of the monitoring system. This monitoring system is applied to3KW,5KW photovoltaic grid-connected inverter successfully for one year. |
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