Design And Operation Analysis Of Distributed Grid-connected Photovoltaic Power Generation

With the deterioration of the traditional energy the natural environment,Photovoltaic power generation technology as a clean renewable energy,has become the hot spots.Due to the upgrading of photovoltaic industry technology as well as the support of the country to the resident photovoltaic power generation,as the main way of solar photovoltaic utilization,the distributed photovoltaic power generation,improving the environmental,economic and social benefits,has been more and more widely used.However,on-grid distributed PV operation will affect distribution network power distribution,power quality,distribution network design and relay protection configuration,reduce distribution network power quality and thus affect the safe operation of power distribution network and power equipment normal operation.But,the requirement on power quality is then more and more strict;this requires the influence on distribution network distribution in the research on grid connected scheme of distributed photovoltaic power supply should be controlled within the allowable range to ensure the supply of high-quality power distribution network.This paper introduces the principle,mathematical model and output characteristics of photovoltaic cells.Then the influence of On-grid Distributed Photovoltaic is analyzed,which changes the passive structure of the traditional distribution network,according to the output characteristics of distributed PV,analyzes the influence on power quality,short-circuit current,tidal current distribution,islanding effect and relay protection of distribution network.Last,the distributed photovoltaic power generation access system of Laishui County Si Huangpu village is designed,including the access system scheme selection,technical requirements of photovoltaic power plant,system dispatching automation et al,and operation of on-grid distributed photovoltaic power is analyzed.The research of this paper provides technical support for large-scale on-grid distributed PV and intelligent distribution network construction.