A power conversion system for converting a direct-current-input voltage (Vdc) to an alternating-current-output voltage (Vac), the power conversion system comprising: a first-converting circuit configured to receive the direct-current-input voltage (Vdc); a second-converting circuit connected to the first-converting circuit in parallel; a first filter circuit comprising a first output inductor and a second output inductor; a second filter circuit comprising a third output inductor and a fourth output inductor; a third filter circuit connected to one side of the second output inductor and one side of the fourth output inductor; and a control circuit configured to generate a plurality of control signals (Sc1, Sc2, Scx1, Scx2) to separately control the first-converting circuit and the second-converting circuit, characterized in that the one side of the first output inductor is connected to the first-converting circuit; the other side of the first output inductor is connected to the second-converting circuit and the other side of the second output inductor; one side of the third output inductor is connected to the second-converting circuit; the other side of the third output inductor is connected to the first-converting circuit and the other side of the fourth output inductor, and wherein an inductance value of the second output inductor is greater than an inductance value of the first output inductor; and an inductance value of the fourth output inductor is greater than an inductance value of the third output inductor, wherein the first-converting circuit comprises a first branch, a second branch, and a first auxiliary branch, wherein the first auxiliary branch is connected between the first branch and the second branch; the other side of the fourth output inductor is connected to the first auxiliary branch; wherein the second-converting circuit comprises a third branch, a fourth branch, and a second auxiliary branch, wherein the second auxiliary branch is connected between the third branch and the fourth branch; the other side of the second output inductor is connected to the second auxiliary branch. a first-converting circuit configured to receive the direct-current-input voltage (Vdc); a second-converting circuit connected to the first-converting circuit in parallel; a first filter circuit comprising a first output inductor and a second output inductor; a second filter circuit comprising a third output inductor and a fourth output inductor; a third filter circuit connected to one side of the second output inductor and one side of the fourth output inductor; and a control circuit configured to generate a plurality of control signals (Sc1, Sc2, Scx1, Scx2) to separately control the first-converting circuit and the second-converting circuit, characterized in that the one side of the first output inductor is connected to the first-converting circuit; the other side of the first output inductor is connected to the second-converting circuit and the other side of the second output inductor; one side of the third output inductor is connected to the second-converting circuit; the other side of the third output inductor is connected to the first-converting circuit and the other side of the fourth output inductor, and wherein an inductance value of the second output inductor is greater than an inductance value of the first output inductor; and an inductance value of the fourth output inductor is greater than an inductance value of the third output inductor, wherein the first-converting circuit comprises a first branch, a second branch, and a first auxiliary branch, wherein the first auxiliary branch is connected between the first branch and the second branch; the other side of the fourth output inductor is connected to the first auxiliary branch; wherein the second-converting circuit comprises a third branch, a fourth branch, and a second auxiliary branch, wherein the second auxiliary branch is connected between the third branch and the fourth branch; the other side of the second output inductor is connected to the second auxiliary branch.