The Design Of Household 5KW Off-grid Photovoltaic System

Conventional energy would release a large number of harmful gas in the process of consumption,and it cannot be stable for a long time to provide energy.Nuclear fuel belongs to new energy source but non-renewable energy,and it would eject radioactive waste at work and damage to the environment,so solar energy resource has obvious advantages by comparison.Solar photovoltaic power generation system is able to convert solar energy into DC or AC power through a variety of equipment,thus,study of solar photovoltaic power generation system is of great significance to use resources efficiently and promote the development of photovoltaic power generation systems.Study of off-grid photovoltaic power generation system as the goal,through the design of off-grid photovoltaic power generation system modules,using simulation tools for simulation,the household 5 kw off-grid photovoltaic power generation system research is implemented in this paper.Hardware such as photovoltaic cells,battery,converter and maximum power point tracking principle and algorithm theory as a foundation for research,the household type 5 kw off-grid photovoltaic power generation system is designed,mainly including configuration and calculation for the solar panels,battery configuration and calculation,the design of DC-DC converter,DC-AC inverter and the design of controller.Based on load requirements,relevant parameters are calculated,suitable materials are selected and the number of series-parallel solar cells and battery is determined.Considering the relationship between input and output,actual load demand and the influence of various factors,appropriate converters are selected.Intelligent controller can realize the automatic control of the system and ensure the normal and efficient operation system,which is very suitable as the control link of the system.Using powerful simulation function of MATLAB/Simulink,on the basis of understanding of working principle and analysis and design for basic structure for each module,the simulation of photovoltaic cells,DC-DC converter and DC-AC inverter is realized and the simulation results are consistent with the theoretical results.