Considering the customer demand increase on electrical energy, it is obviously seen that the new system requirements such as providing instantaneous data flow, remote monitoring and controlling, would occur. These new system requirements should be adapted to existing electrical infrastructure with minimum cost. In this paper, the system control requirements and communication architectures of electrical grids are discussed. The possibility of the usage of the power line communication (PLC) for the smart grid system is examined. In order to improve communication quality of the smart grid, a new PLC system model is designed in MATLAB. Then Medium (MV) and Low Voltage (LV) applications are simulated using the MATLAB. The applicability of this new PLC system model to smart grid communication systems is discussed.