This paper describes the working principles of multilevel inverters. Multilevel inverters are power electronic devices that due to increasing demand from multiple fields of the industry are becoming more widespread. Multilevel inverters have many variations and since they are much more complex than traditional two-level inverters, understanding them can be more challenging. This paper investigates different topologies and control methods that have found their place in the industry. Some of these are further inspected in a simulation study. The simulations are carried out in MATLAB Simulink. There, the effects of different parameters associated with the inverter are studied. Based on the results of these simulations a suitable topology, a three-level null point clamped inverter, is chosen to be built. The built inverter is briefly tested to compare its performance to the results of the simulation study. As the results of these tests meet the expectations, the NPC inverter will be the subject of further research.