The Design Of Low-power Stand-alone Photovoltaic Controller

With the situation of energy resource crisis and the problem of circumstance pollution become more and more serious, exploitation and utilization the clean and regeneration energy resource is imperative. Solar energy is one of the most clean, practical and large scale regeneration energy resources. The whole world focuses on the use of photovoltaic (PV). Solar energy has an inexhaustible, clean and safe features, is the ideal renewable energy sources. Solar photovoltaic technology as an important part of the utilization of solar energy, wich is regarded as one of the most development potential power generation means In the 21st century. Study the solar photovoltaic power generation system has the vital significanceis for the ease the energy crisis, reduce environmental pollution and reduce the greenhouse effect.As the solar arrays are the photovoltaic energy supply system part and the core components, therefore, this paper first describes the composition and characteristics of PV systems, and analyses solar radiation intensity and temperature to the impact of solar arrays, then introduces the mathematical model of solar cells and describes the maximum power point track (MPPT) issues. this paper simulates the maximum power point track in the methods of the MATLAB.The independent PV systems had to use battery to store energy, battery in the entire PV system costs account for a large proportion, and easy damage. so this paper describes the sealed valve-regulated lead-acid battery characteristics and response characteristics of batteries, designed a automatical way to achieve the "four-phase charging" circuit, to ensure that extense the battery life maximum.In this paper, the current widely used solar independent photovoltaic power generation system was carried out to study, and summarized the advantages and disadvantages about the DC / DC converter topologies, this paper used Boost circuit as a former stage to boost circuit, and its main circuit parameters was designed.The invert circuit used full-bridge inverter circuit, and analyzed the structure and control strategy of PV system, this article used an improved fixed-frequency SPWM current-control strategy, the inverter achieved sinusoidal current output control better, and achieved hardware circuit design and software design based on TMS320F2812 DSP control system.The system achieved a better control scheme that were proposed in this paper, completed the various functions designed, through the experiments show that the control scheme is simple, feasible, stable and reliable, had a good performance.