Quick Calculation About The Power Capacity Of Off-gridhome Power System In Considerations Of Realistic Scenes

Energy is the foundation of the development of human society.Because of the excessive use of mankind in the last century,the energy reserves of the earth have declined sharply,and the environmental pollution has become more and more serious.With the continuous progress of science and technology,solar energy has coming into everyone's eyes,especially playing an important roll in the power supply.Because of the environmental protection,sustainability,universality and other characteristics of solar energy,it is applied more and more in power supply.The State Council issued a strategic plan for energy development in 2014,clear that in 2020 China's current energy infrastructure improvementmeasures is to reduce the use of coal,increased use of natural gas,develop solar energy,wind power and other green energy.Photovoltaic power generation system once boarded the hot topic of discussion in the energy sector.The country's continuous attention and promotion of thephotovoltaic power generation,and the continuous improvement of the technology of photovoltaic,has been widely used in many aspects of life.This paper,by referring to relevant literature,has researched photovoltaic power generation unit,storage unit and small diesel engine's working model,analyzes the main structure and working mode,usingthemathematical model toanalyze the economical efficiency of Photovoltaic system,energy storage system,small diesel engine system,a variety of combinations of modes of operation,using the probability of loss of load to discuss the reliability of various composite systems.The important feature of photovoltaic power generation is self-sufficiency,especially for places with remote geographical location and abundant lighting conditions,it has high promotion advantages.From the point of view of practical work,this paper analyzes the power supply strategy,capacity planning,economy and power supply reliability of a home off-grid with real data as the support.This paper also use simple andhigh efficient method ofsubstitution,enumeration,gradient and chart,to analyze the power supply system of off-grid independent home,research different combination of photovoltaic system,diesel generator and energy storage system,select the most favorable power supply model and capacity allocation for the family on the basis of the annual average cost andloss of load probabilityof different operation modes.