Design Of Staggered Parallel Step-up Miniature Inverter

Energy is an essential basic substance for human survival and social development,and plays an important role in social development and technological progress.With the large increase in the global population,the reserves of traditional fossil energy are becoming increasingly scarce and cannot continue to support the sustainable development of humankind,which has brought great restrictions to the development of society and technological progress.Therefore,pollution-free,renewable solar energy has generally attracted people's attention.Aiming at the current trend of photovoltaic grid-connected power generation and the widespread development of photovoltaic in the future,a 1KW non-isolated grid-connected inverter was designed.The paper first introduces the research background and significance of inverters,explains photovoltaic power generation technology,and analyzes the current research status of photovoltaic development at home and abroad.Secondly,the basic topology and principle of the staggered parallel micro-inverter are discussed,the staggered parallel technology is briefly introduced,and the staggered parallel Boost circuit is determined as the main topology of the DC-DC converter in the front stage and the DCDC converter in the rear stage.AC conversion uses a full-bridge inverter structure.By analyzing the control strategy of the micro-inverter,the front-end DC-DC conversion adopts the perturbation observation method of maximum power point tracking to achieve the maximum power output of photovoltaics,and the back-end inverter grid-connected circuit uses a closed-loop control strategy and voltage feedforward compensation.Strategy.After that,the hardware parameters of the main circuit are designed in detail,the control system of the hardware circuit is built,the detailed design process of the software control program is carried out,and the simulation design is performed using Matlab software,and the simulation results are analyzed.Finally,a 1KW staggered parallel step-up single-phase photovoltaic inverter is developed.The main control chip uses STMicroelectronics' STM32F103ZET6 to carry out detailed program design of the software and hardware systems to achieve the output efficiency of the single-phase photovoltaic inverter.Maximize the stability of the system and analyze the experimental waveforms and results to verify the stability and reliability of the system.