Design Of Detection System Based On PV Power Station

As an inexhaustible and renewable energy, solar energy become the developed object of countries around the world competing. The mainly using the form of Solar energy is photovoltaic power plants, which, a large number of scattered, working environment affected by multiple factors. The characteristics making the power plant maintenance and monitoring difficulties. However, the precise detection of the PV power plant environmental factors is essential for the safety of the power plant. Moreover, the precise detection of the environmental factors can also provide basis data for the establishment of photovoltaic power plant generating capacity model. Therefore, integrated testing system, which have remote transmission of test results, of complex environmental factors and in harsh working conditions and unattended conditions is great significance for the construction of PV systems. The research is mainly done the following work.First, the paper analyzes the operating environment of the PV power plant, in particular, the system component temperature, ambient temperature and solar irradiation on the operational status of the PV power plant, focused on the detection of environmental factors after solar in the atmosphere. By analysis of the volt-ampere characteristics of silicon photovoltaic cells, discussed the feasibility of detection of optical radiation exposure to short-circuit current output of silicon photovoltaic cells. At the same time, the ambient temperature testing and component temperature sensing based on the detection by the thermal resistance and semiconductor integrated temperature sensor design.Secondly, the paper discusses the effects of the temperature and spectral effects of the silicon photo cells and the impact of errors by the effect on the precision testing. Discusses the application of Blaesser method for the detection of optical radiation exposure in the standard testing environment to a different temperature and air quality (air mass) through the introduction of amendments to the effects of silicon photovoltaic cells in the test results spectrum, to ensure the short-circuit current output and optical convergence according to the amount to maintain a linear relationship.On the basis of the principle of analysis related to circuit design. Adopted STC12C5A16S2 microcontroller as the core of the device for data acquisition and testing. Electronic circuitry to detect the PV power plant environmental parameters, the sampling of ambient temperature, component temperature and optical radiation exposure converted into a corresponding electrical signal. The functions of real-time control and data processing of the MCU to complete the system for the detection of environmental parameters, the 485 bus is configured with the host computer to communicate. Software design, including the interference of light irradiation measurement, temperature correction and spectral calibration, ensure the accuracy of measurement.Finally, the paper discussed the design of anti-jamming circuit, because that the interference on a sophisticated detection system from interfering circuit is enormous. It researched the influence on the electric circuit from the electrostatic coupling and impedance coupling.In this paper, the design of integrated detection system is low cost, small size, easy installation and reliable operation. It can achieve high-precision optical radiation exposure in all weather conditions or the different environment. It also can work long time independent and not require site maintenance after the operation of the installation is basic and does not require site maintenance. The PV power plant detection system can be applied to the detection of the working environment.