AUTOMATIC DESIGN OF SINGLE-STAGE SOLAR PHOTOVOLTAIC GRID-CONNECTED INVERTER SYSTEM

This study aims to improve the efficiency of energy conversion, and optimize the design of the solar cell structure based on the single-stage solar photovoltaic grid-connected power generation technology. Firstly, the characteristics of conventional power batteries are analyzed. Additionally, the inverter structure analysis is the characteristic research method of the inverter system. The advantages and characteristics of the system are analyzed through the re-architecture of the photovoltaic grid-connected inverter system. In addition, the solar power generation cooling and heat dissipation technology are systematically re-optimized through experimental simulation. The results show that, compared with the traditional power battery, the solar photovoltaic grid-connected solar cell design is more stable in current and voltage. The energy conversion efficiency of the battery is increased by 23%, which can better realize the continuous and efficient use of solar energy. When the outer resistance region is infinite, the current of the battery rapidly rises to nearly 300A, while the voltage rapidly drops to 0V. Additionally, through the simulation experiment, the simulation cloud diagram and the temperature rise curve compare the thermal characteristic parameters of the traditional power battery and the solar battery under different charge and discharge rates. The life and safety of the power system are studied and the changes of the battery under high and low temperature conditions are analyzed. Battery life decay and thermal runaway are simulated. The results show that with the increase of charge-discharge rate and the increase of cycle times, the usable capacity of the battery will decrease seriously. When the battery is internally short-circuited, the local current inside the battery is too large and the battery thermal runaway occurs. The results have practical reference value for the optimal design of solar photovoltaic grid-connected systems and the efficient utilization of solar energy resources. © 2022, Cefin Publishing House. All rights reserved.