Abstarct: Electric and hybrid propulsion systems of vessels can become a good option to replace the mechanical propulsion system. The propulsion system of any device is actually responsible for producing its driving force. Various systems have been used in ship propulsion, including the propulsion system with the help of human power, with mechanical structure, and finally, electric and hybrid structure. Rapid developments in the field of power electronics made engineers turn to the design and construction of electric propulsion vessels. Ripple torque and harmonics in the electric propulsion system of vessels is one of the important issues, because the lower the ripple torque, the lower the amount of noise in the ship, and the lower the amount of harmonics injected into the electric motor, the longer the useful life of the motor and the higher the efficiency. will be. Considering that the motor drive system is powered by an inverter, in this treatise, the focus is on the inverter part of the motor drive systems. Multilevel inverters have received much attention from researchers due to their unique features. In this treatise, two new structures of multi-level inverters are presented, one in high powers to drive high-power floats and the other is a compact multi-level inverter to drive low-power floats. Both proposed multilevel inverters are analyzed in full detail in different working modes and their switching tables are presented to control the proposed inverters. By comprehensively comparing the second proposed structure with previous similar structures, the advantages of reducing the number of elements and the total harmonic disturbance have been confirmed. To prove the validity of the proposed structures and also their efficiency in driving electric motors, the simulation results for the first proposed structure and the experimental results for the second proposed structure have been used.