Research On Control Method For Photovoltaic Inverter

Along with the rapid development of global economy and population increase, so coal, oil and natural gas energy are hourly consumption, global energy crisis has become the subject faced together around the world. Meanwhile, energy consumption has caused environmental pollution, and this a series of problems will also be restricted social economic development even threatening human survival of serious obstacle. Therefore new energy application is becoming a global research hotspot. Solar energy is a kind of renewable energy, it is clean, rich resources, inexhaustible and will not pollute the environment, so solar energy to replace fossil energy is to protect the ecological environment,take the road of sustainable development must go through. thus the research on photovoltaic technology is more important to have meaning.PV inverter is part of the core control in PV system, this topic is a research based on small independent photovoltaic power generation system on the inverter control. First introduced the classification and the components of photovoltaic power generation system, analysis the energy conversion process of the power generation system of the independent photovoltaic, and the structure and function of each part, detailed study of the inverter circuit and working principle. And to selected the boost step-up circuit and Single full-bridge inverter circuit as the inverter main circuit design.By the nonlinear characteristics research of photovoltaic cells, established a mathematical model, by analyzing and comparing the various method of maximum power point tracking, proposed a new control method of the MPPT,to achieve the maximum power point tracking of PV array in this article; and then analyzed of the battery charge and discharge characteristics, designed the control devices of charge and discharge, double closed-loop control method is selected on the battery charge and discharge control. Technical indicators for this topic, were a mathematical model for inverter part of the PV inverter, control of the inverter circuit use of deadbeat control algorithm.Finally, the MPPT control,control device for charge and discharge,link inverter Integrated into a whole for overall control and analysis, analysis of the coupling relationship between the various parts, a logic control method is proposed, The combination of the parts together to complete, to achieve the ultimate control of the Small-scale photovoltaic power generation inverter.Design for hardware design, including drive circuit, protection circuit, detection circuit, liquid crystal display circuit and control circuit and so, and software design for control algorithm. Finally, select the parameters based on technical indicators, established a small experimental prototype, experimental results verify the correctness and feasibility the algorithm theory of the Small-scale photovoltaic power inverter control.