Research And Design Of A Small Household Photovoltaic Off-grid Inverter

Photovoltaic (PV) power generation, as one of the effective use of solar energy, has been widely used with many advantages. PV inverter is the core equipment of power generation system. Taking the off-grid inverter as the research object, the following contents were studied in this thesis:its topology structure, control strategy, hardware and software design. The main work of this paper is as follows:Firstly, the development and trend of PV power generation is analyzed. The off-grid PV system is briefly introduced.Secondly, the principle and the modulation method of the off-grid PV inverter are discussed. A topology and a control strategy of small power off-grid PV inverter are selected. Thirdly, the hardware and software of a small power off-grid PV inverter based on DSP is designed. The hardware circuit includes main control MCU, DC sampling, AC sampling, IPM driver module. The software includes the main program, the system interruption programming, AD sampling correction, and so on.Lastly, based on the theoretical analysis and simulation, the experimental prototype is set up. Each module of the prototype is debugged, and the prototype is carried out. The test results are provided to verify the feasibility and stability of the system scheme.