Development Of Unattended Photovoltaic Power Station Wireless Supervisory System

With the wide application of solar photovoltaic power station in various fields, the power station security and parameter detection are becoming more important. The unattended photovoltaic power station wireless supervisory system with multi-parameter monitoring, multi-channel data acquisition and data fusion technology is developed in the thesis. The content of the thesis mainly includes the following aspects:1) The whole design of the system is proposed according to throughly studying and analyzing the requirements of photovoltaic power station supervisory system and the characteristics among many kinds of communication methods. Double loop intelligent control system is implemented by combining embedded processors, general-purpose computers and mobile terminal, combining GPRS and INTERNET.2) Intelligent measure and control front-end based on embedded technology is designed. The remote vision system, security alarm system, environmental monitoring system and electrical parameters acquisition system are integrated to form an organic system. Thus, power charge-discharge parameters, environmental parameters, perimeter security parameters and the video image can be monitored by the use of this front-end.3) The solution to system's intellectuality, reliability, instantaneity are analysed and discussed. Multi-sensor weighted data fusion technology is used to improve the intellectuality and data reliability. Filter circuit, isolation circuit, impedance-matching circuit, induced voltage suppression circuit are designed to improve the anti-jamming capability, "watch-dog" redundant instruction are designed to improve the anti-jamming capability. Instruction authorization and user authorization are used to improve the system's reliability. Also optimized protocol, Error Control Technique and DMA communication mode help to improve the rate of data transmission and system responsiveness.4) The system protocol is proposed according to throughly studying the relevant protocol and national standards, UDP protocol is used in the transport layer, while application layer protocol is comprised of command frame, response frame, and exception frame. User authorization and Error Control Technique are also used in the system's protocol. System scalability and station expansion are also taken into consideration.5) Schematic design, circuit board layouts and debugging. Software design and debugging have been completed. The module circuits are designed based on STM32F microprocessor. The data acquisition and processing program, intelligent control program and communication program have been completed, which help to achieve the goal of wirless communication, data collection and save. Also the system performance is tested and the further plan and the next task are put forward.