The Research On Photovoltaic Power Grid-Connected In Baoding Gaoyang County

Most of the world's power systems are based on centralized power supply,long distance transmission and large power grid interconnection of power users,the power supply because of the large capacity,easy to transport and management is widely used.But with the development of the city and the increase of population,the disadvantage of the power grid is becoming larger and larger,and the disadvantages of this kind of power supply are gradually emerging.First of all,with the increase of peak and valley power grid,load rate decreased year by year,leading to the decline in the utilization of power facilities,resulting in energy waste;secondly,the power grid accident is getting higher and higher.Therefore,placed directly in the user in the vicinity of the distributed power supply has become an alternative,photovoltaic power generation because of its clean,safe and efficient characteristics,has been widely used to promote and improve the security and economy of power grid operation.The impact of photovoltaic power supply on the regional distribution network will have a certain impact: first,the distribution of the regional distribution network topology and the distribution of short circuit current have been changed.Secondly,the primary protection system of the regional distribution network cannot meet the demand of power supply quality.Therefore,it is significant to study the users and grid connected generation system of photovoltaic grid connected generation systemThis article first introduced the distributed power impact on power system research present situation,this paper expounds the working principle and characteristics of photovoltaic power supply,the key research of photovoltaic power supply access to distribution network protection system,the impact of and put forward the improvement plan.In this paper,on the premise,try not to adjust the distribution network protection device for the access of distributed power supply capacity,put forward and short-circuit current calculation model of the access capacity constraints.In the end,the access system scheme of a 300 kWp distributed photovoltaic power generation project in Baoding Gaoyang as an example to discuss the feasibility of the project a single photovoltaic power grid,through quantitative calculation,the grid plan of the project can meet the practical engineering requirements...