In my thesis the effects of the Hungarian power system’s changes on frequency stability have been examined. If the number of synchronous generators decreases in the power system, it can cause faster frequency changes and bigger frequency oscillations. During my work the Hungarian and European specifications have been taken into consideration. The paper examines the Hungarian power system’s frequency stability by modelling the power system with synchronous generators and power converters of the non-synchronous generators.
This study begins with a literature review of system stability, electromechanical oscillation, transient stability and the issue of the reduction of inertia. In the third chapter, the technical specifications of the frequency and the possible way of the frequency control are presented. The next part investigates the effects and academic background of the inertia and explains the utilisation of the synthetic inertia. The fifth section presents the theoretical operation of the generators and the way of modelling them in the PSS@E simulation program. The Czech, the Slovak and the Hungarian power systems’ changes have been examined. The PSS@E program has been used to make simulation of 500 MW and 1200 MW outages. The thesis examines the result of both simulations, with and without synthetic inertia. As a conclusion, advice has been formulated to the Hungarian transmission system operator on which devices and products can help the secure operation.