Research And Design On Distributed Grid-connected Photovoltaic System

Distributed photovoltaic is one important way of renewable energy utilization. With the increase of energy requirement, research on the distribution and implementation of photovoltaic power generation is also deepening. Especially in recent years, Countries around the world have made the construction of distributed photovoltaic subsidies and tariff preferential policies, making the construction of distributed photovoltaic power ushered in the spring. In 2009, China launched the "Golden Sun" and photovoltaic construction, and distributed photovoltaic power generation project has taken shape.Grid-connected system of distributed photovoltaic power generation is the key component of distributed photovoltaic power generation. Besides, it is the bond that would effectively combine photovoltaic power generation system with power grid. This article mainly analysis the status and background of distributed photovoltaic power generation and grid-connected system, and makes the research on the principle of distributed photovoltaic power generation, grid and distributed systems principles and structure of photovoltaic and the Grid system. Through the different voltage line connected to the grid, T connected to the grid and grid connected photovoltaic internal users access systems analysis and research, the characteristics of different forms of access and application objects could be concluded. Besides, using different access methods may produce effects on the power flow, the impact of power quality and protection for impact analysis and research, reached the appropriate monitoring and protective measures.On the basis of theoretical analysis and research, this paper made studies and design on Haining Heliyuan 30MW distributed photovoltaic grid-connected project. According to the project’s background, the paper mainly analyzed and researched the principle of Heliyuan distributed photovoltaic grid-connected systems. In addition, the paper analyzed and calculated the influence of Heliyuan distributed photovoltaic grid-connected on the grid, and made the design on the primary system and the secondary system of Heliyuan distributed photovoltaic grid-connected. Furthermore, the project had finished the configuration and setting calculation of grid-connected system and configuration of the dispatching automation and communications systems of Heliyuan project had been finished. Finally, the research made the full tracking analysis and calculation on the Heliyuan project design and construction.Based on the analysis of distributed photovoltaic power generation and grid-connected system and based on the design of Heliyuan 30MW distributed photovoltaic grid-connected project, suitable field access mode would be obtained, and the system issues caused by grid would be solved. The finding may have important reference value and significance on the future development of distributed photovoltaic power generation in Haining.