Enhancement of Renewable Energy Systems Contribution to Power System Frequency Regulation

Abstract

Modeling and studying of the generation mix of any power system is a vital means to ensure safe operation and to achieve sufficient stability and reliability levels of performance for the power system. The most important variables that largely affect the power system are voltage and frequency. This thesis is concerned with the frequency variable. In the first part of this thesis, a model for the Egyptian electric power system is developed, according to the latest declared data, to study the effect of outage of largest generation units (Kuriemat 650 MW) on the grid. The study in this part will focus on the frequency variation due to this outage. The Load Frequency Control (LFC) is added to the developed model. A simulation is carried out depending on two actual data sets for the highest and lowest loading conditions for the year 2017. The simulation result shows the power system frequency variation and its deviation from the nominal frequency as a response to the outage. It also shows how the LFC responds to restore the power system nominal frequency through both the primary and secondary frequency control schemes. In addition to the power system inertial response obtained from releasing the stored kinetic energy of the synchronous generators’ rotating shafts and loads such as induction motors. The results of the study done in this part will be used as a core for testing the impact of generation outage on the frequency variation as will be discussed in the second part when increasing the penetration levels of wind energy to the Egyptian power grid.