Design Of 1.09MWp Distributed Photovoltaic Power Station In Tonghe County

The rapid development of contemporary society is accompanied by a large amount of energy consumption,the problem of environmental pollution is becoming more and more serious,and the price of fossil energy fluctuates with the change of the world situation.Therefore,the development of new energy has become the main direction of research in the world.As a typical clean energy,solar energy can solve many problems caused by the energy crisis,and is conducive to achieving the goal of carbon peak and carbon neutrality in China.At present,China is vigorously developing solar energy resources around the world,and is in a leading position in the field of photovoltaic power generation.Heilongjiang Province is rich in solar energy resources and is suitable for the construction of various types of photovoltaic power stations.In order to better improve the power grid structure of Tonghe County and increase the power grid capacity,this paper proposes a design scheme of 1.09 MWp distributed photovoltaic power station in Tonghe County based on the actual situation of Tonghe County.This paper first summarized the advantages of distributed generation,and investigated the current research status of photovoltaic power generation at home and abroad.The feasibility of building a distributed photovoltaic power station was determined by analyzing and evaluating the current situation of Tonghe County power grid,local solar energy resources and climatic conditions.Secondly,the design of the photovoltaic system was carried out,and the appropriate photovoltaic battery components and inverter models were selected.The PVsyst software was used to analyze the optimal inclination angle of the photovoltaic array,and the optimal arrangement of each photovoltaic array was designed,and then the power generation of the photovoltaic power station in the next 25 years was calculated.Then,the electrical primary part of the photovoltaic power station was designed,and the electrical wiring scheme that meets the requirements of 380 V voltage level was selected.The operation mode of spontaneous self-use and margin access was adopted.Through power flow analysis,short-circuit current calculation and reactive power balance analysis,the equipment selection work was completed,and the lightning protection grounding device was set to ensure the safe and stable operation of the system.Finally,the electrical secondary part of the power station was designed from three aspects: relay protection configuration,system dispatching automation,system communication and monitoring.By using the remote control ability of photovoltaic power station itself to access the local dispatching network,real-time monitoring of all kinds of information of photovoltaic power station,to ensure that the fault information could be sent to the superior dispatching center in time,and through the wireless private network to realize the communication function of the system.The photovoltaic cells and power generation system were simulated and verified by MATLAB software.At 25°C,increasing irradiance could maximize the output power and conversion efficiency of photovoltaic cells.The output voltage,current,active power,reactive power and power generation system efficiency of the inverter were analyzed,which could meet the design requirements.By analyzing the overall economic and environmental benefits of the photovoltaic power station,it is fully demonstrated that the completion of the 1.09 MWp distributed photovoltaic power station in Tonghe County can not only meet the electricity demand of residents,reduce electricity consumption,but also reduce air pollutant emissions and effectively protect the local environment.