Medium voltage converter has high requirements for the realization of modulation due to its complex topology. When the same control system is applied to different topologies and modulation methods, the traditional modulation scheme needs cumbersome and error-prone operations because a large number of control bits need to be configured. In this paper, a universal modulation scheme is proposed based on the idea of event-driven. The data transmission between processor and logic cells is abstracted as an event and the configuration of control bits is omitted. The processor adds an event calculation process that is easy to modify as an event collector. The circuit in the logic cells is simplified to a single unified carrier, which greatly saves the hardware resources and increases the universality. Compared with the traditional scheme, it can be found that the proposed scheme has the following advantages: it is more convenient and flexible to switch in different applications; it reduces the complexity of logic cells and the consumption of hardware resources. The proposed scheme is analyzed and the feasibility of the scheme is verified by experiments on a self-developed medium voltage controller taking the five-level nested neutral point piloted topology as an example.