The rising electricity production from renewable energy sources has created a challenging engineering task in Europe. The main problem is the difference between the volatile energy production and more or less predictable consumption. The energy consumption with its regular daily variations behaves itself almost as in the last decades. This statement however is not true about the energy production. Easily controllable power plants, such as nuclear or coal power plants are steadily replaced by more eco-friendly wind or solar power plants. The electricity production depends thus on wind and solar radiation, and can be predicted, but not arbitrarily wished. In order to decrease this consumption-production gap, additional energy storage facilities are being built. In this diploma thesis, the electrical part of a pumped storage hydro power station is modelled and simulated using the SIMSEN software. The working principle of a pumped storage hydro power plant is explained in chapter 2. Short description of the SIMSEN simulation tool is in chapter 3. The main goal of this thesis was the comparison between a complete and a simplified model of electrical part of the pumped storage hydro power station. Both models are introduced in chapter 4, and their comparison is in chapter 5. The last chapter deals with possible future development. Especially, advanced techniques in synchronous motor control for a better transient behaviour will be discussed. Moreover, different pulse forms of the pulse-width modulation for lower total harmonic distortion will be considered.