Abstract: In order to solve the problems of harmonic exceedance and delayed dynamic response caused by dead zone effects and grid frequency fluctuations in distributed photovoltaic inverters, this paper takes a rooftop photovoltaic power generation project in an industrial park as an example, analyzes the causes of inverter output current distortion, and proposes an improved repetitive control method based on dead zone compensation feedforward and adaptive phase lead compensation. The research results indicate that this method effectively eliminates low order harmonic components, significantly reduces the total harmonic distortion rate of the output current, and maintains good compensation accuracy even when the grid frequency fluctuates, achieving a synergistic improvement of the system's steady-state accuracy and dynamic response performance.