Widespread attention has been given to solar power generation technology due to the development of clean energy. The efficiency of solar power generation technology is directly affected by the conversion efficiency of grid-connected inverters, which act as the interface between distributed power generation systems and the power grid. In this study, a new type of high-efficiency grid-connected inverter has been proposed to address the drawbacks of existing inverter technology, such as low conversion efficiency, increased costs, and weight. Through one-stage SPWM conversion, power and energy transfer from the DC end to the AC end can be achieved, resulting in a significant reduction in the switching losses of the overall inverter and enabling stable operation of the inverter. Firstly, the correctness of the frequency modulation scheme was verified at a low frequency of 10KHz. Subsequently, a prototype with an input power of 5KW, 440V-880V output voltage, and a switching frequency of 20KHz was simulated. It was found that when the drive pulse was extremely narrow (i.e., the duty cycle of the drive signal occupied a minuscule proportion of the entire pulse cycle T s ), there was no pulse voltage output at the V b-0 point. Finally, verification of the inverter was carried out through Matlab/Simulink simulation. After DC compensation was added, stable operation of the inverter was achieved.