This paper presents a comprehensive study of an I-Luo converter integrated with a solar Photovoltaic (PV) system for DC link voltage control, employing a Modified Squirrel Search Optimization (MSSO) algorithm-tuned Proportional-Integral (PI) controller. The Interleaved Luo (I-Luo) converter, known for its ability to provide a higher voltage gain than conventional boost converters, is investigated for its effectiveness in maintaining stable DC link voltage under varying solar irradiation conditions. The study reveals that the I-Luo converter, when combined with an MSSO-tuned PI controller, offers superior performance in terms of voltage gain and efficiency, particularly in scenarios with high variations in solar input. The MSSO algorithm’s optimization of the PI controller parameters ensures a faster transient response and minimal steady-state error. Simulation results demonstrate that the I-Luo converter, with its enhanced control strategy, outperforms the boost converter, making it a more suitable choice for solar PV systems where high efficiency and stable DC link voltage are critical. The findings highlight the potential of the I-Luo converter in renewable energy systems, especially for applications requiring high performance and reliability.