Research On Distributed Photovoltaic Direct Current Power Supply And Grid Connected Transmission Control

Renewable energy is widely applied in green environment recently, because of its unique advantages and favor solar energy more and more popular. But the output characteristics of photovoltaic cells affected by external environment factors, and the low photoelectric conversion efficiency of photovoltaic cells and some of expensive, for effective utilization of solar energy, we are need to be effective control of photovoltaic power generation systems. This paper first introduces the research of background and significance so that analysis of current situation of the development both at home and abroad, expounds the distributed photovoltaic maximum power point tracking strategy of DC power supply and DC power grid transmission control strategy is the main research content of this article.First, in this paper, the photovoltaic power generation system of solar cell model has carried on the detailed analysis and research, including the basic principle of solar cells, working characteristics and output characteristics etc. Then, in this paper the electrical characteristics of PV cells are analyzed and the maximum power point tracking(MPPT) methods are studied, mainly include: in view of the MPPT control method of fuzzy control strategy, through analysis and design of the MPPT fuzzy controller and gives the detailed process of controller design,In addition,Establishing the MATLAB simulation model, put forward the corresponding control strategy, and a simulation experiment was carried out. The simulation results show that the control strategy is feasible.Finally, this article in view of the micro power grid inverter control mode, the analysis of the three-phase photovoltaic(pv) grid inverter topology structure, analyzes the PQ control, V/f control, Droop control theory; At the same time the mathematical model of three-phase voltage inverter are studied, and through the coordinate transformation has carried on the detailed analysis of the decoupling control and the research. In addition to the problem such as photovoltaic power generation system islanding, the islands of the method of detection is given, including the active detection method and the passive detection method, so that they can quickly solve the problem encountered in the process of inverter control.