Study On Key Technology Of Inverter System With High Conversion Efficiency

Because of the intensification of the world’s energy shortage and environmental pollution, thedevelopment and utilization of renewable energy is increasingly important. The adequacy ofenergy supply is a necessary condition for any one country to maintain the steady rise of nationalstrength. Solar energy is a cleaning and economy renewable energy; it is particularly favored byindividual countries. Solar power technology is also becoming more and more mature. There arerequirements of withstand voltage and insulation for solar panels, the requirement limit the numberof components of photovoltaic cells in series, the photovoltaic power generation systems oftenemploy a DC/DC module to boost. The DC/DC converter performance has a direct impact of theconversion efficiency of the photovoltaic power generation system, therefore, it has importantpractical significance to study high conversion efficiency photovoltaic DC/DC converter.In this paper, the main research contents are about the photovoltaic cell maximum powerpoint tracking (MPPT) and push-pull circuit. At the same time, based on the DSPF2812digitalcontrol technology, the main circuit of the DC/DC module hardware design is completed, whichverify the feasibility of the technical route. First, an overview of the research background and theresearch status of this thesis is described.Next, the solar cell characteristics were analyzed, while a variety of the working principle ofthe MPPT is introduced. Based on the analysis and comparison of the advantages anddisadvantages of various MPPT technologies, A CVT start+single-variable adaptive incrementalconductance (INC) improved algorithm is implemented. The feasibility of this method is verifiedby MATLAB simulation software. At the same time, the reasons of the failure about the maximumpower point tracking algorithm and approach methods are analyzed.Then, the topological structure and working principle of the DC/DC push-pull converter aresimply introduced; The generation mechanism of the leakage inductance of the DC/DC push-pullconverter is analyzed in detail, Converter leakage inductance spike hazards are described. Based onthe analysis and comparison of the advantages and disadvantages of various the leakage inductanceprocessing technologies, switch active clamp technique has been proposed to deal with the leakageinductance in this paper. The feasibility of this method is verified by MATLAB simulation software.This method can reduce switch tube impulse caused by the leakage inductance spike voltage and toreduce power consumption caused by leakage inductance, to improve the efficiency and stability ofthe converter.Finally, the DC/DC push-pull converter’s design ideas are specifically elaborated,the realization of PWM, the realization of the control scheme and the design of main hardware circuitare introduced.Then the prototype of the DC/DC push-pull converter is made, experimentalwaveforms are debuged to verify feasibility of the technical route.