 The proposed three-legged quasi-Z source inverter, QZSI, is a novel solution to reduce the input side ripple of single-phase inverters used in renewable energy applications. It employs a quasi-PR control method to inject specific frequency harmonics into the input current, which effectively eliminates the drawbacks of passive filtering strategies, such as high-value impedance networks, low-power density, and weak system stability. Simulations show that the addition of the third bridge leg under full load conditions reduces the input side inductor current ripple by 72.86%, the second harmonic ripple by 4.5%, and the fourth harmonic ripple by 2.1%. Additionally, the DC bus voltage ripple is reduced by 90.76%, and the total harmonic distortion of the output voltage and current are both below 1%. This article was authored by Chuanyu Zhong, Chuanchu Chao, Weichi Chen, and others.