The Research Of Single-phase Isolated Photovoltaic Inverter

With the rapid development of the economy and the rapid depletion of traditional energy sources,energy shortages and environmental pollution have become one of the main reasons for restricting economic development.Solar energy,a clean and sustainable energy source,has attracted more and more attention.Solar power generation has also become one of the hotspots of research in all over the world.In this paper,the research object is the single-phase isolation photovoltaic inverter,mainly completes the following research contents:1.By Comparing and analyzing the single phase isolated photo-voltaic inverter,we choose the choice of main circuit topology structure completed,mainly including the most power tracing circuit,push-pull booster circuit and full bridge inverter circuit.2.We designed a 1kW single-phase isolated photo-voltaic inverter prototype which based on the theory,the hardware circuit of each module is analyzed and designed in detail.Including the maximum power point tracking circuit,push-pull booster circuit,full bridge inverter circuit,sampling and protection circuit,DSP control circuit,auxiliary power circuit,etc.3.The tracking strategy of the maximum power point,bipolarity SPWM modulation and PI double closed loop control strategy are analyzed.The DSP software control flow chart of inverter has been designed,also including the main circuit topology and control strategy are simulated and analyzed.4.Finally,the experimental results show that the design of the single-phase isolated pv inverter has achieved the expected goal.