This paper presents a new power system analysis tool named Educational Simulator of Smart Grids (SESG) for isolated, connected, and interconnected nanogrid and microgrid systems. The SESG is a simulation tool launched through a Matlab application. It is based on theoretical concepts, enabling the modeling of various systems and the implementation of management and optimization techniques for different renewable energy system topologies. The simulations are performed using MATLAB software, where models are developed and simulated. Furthermore, a developed manager is offered to enhance the value of the SESG application in terms of the software, incorporating the creation of a 3D environment. As a result, the observation and management interface will serve as a link between these two aspects. Our work focuses on the optimal management and load balancing of nanogrids connected to Electric Vehicle (EV) stations, and we will integrate all the results into the SESG simulation tool. We introduce the overall graphical interface that we have developed within the SESG application. In addition, we integrated a microgrid system into the SESG simulator to visualize and analyze the dynamic behavior of frequency and power transfer for an isolated and interconnected system with hybrid storage. Our work was based on two topologies: isolated and interconnected.