This paper includes modeling and simulation of 180 MW units of pumped storage power plant with Variable speed machines. In this method, voltage source inverters are used instead of traditional cyclo-converters. This paper aims to control the voltage source inverters and maintain DC voltage at a constant value. AC/ DC/ AC converter is used in system configuration structure in order to control and change voltage and frequency. AC / DC converter is a three-phase rectifier bridge as well as DC / AC converter is a single phase inverter which includes 12 IGBT (insulated gate bipolar transistor) and output includes constant voltage designed from inverters output. Firstly, the control structure of the machine and the transformer sections will be described and the block diagram of each part is shown, then the equations for each part descried and the overall control structure of plant will be achieved. The simulation of this methods by applying Matlab software have been presented.