In the first part of my final thesis, I present the basic elements of the reactive power compensation. After that I shortly describe its economic reasons. Then I discuss the types of the power correction and I analyze the structure of the low voltage power factor correction devices. After that, I briefly describe the components and the main aspects of their application. Then, I examine the effects of the harmonic distortion on power factor correction devices. Having demonstrated the potential problems (eg. network resonance), I discuss the possible solutions.
In the second part of the thesis, I design reactive power compensation, and my plans are based on the analysis of the energy consumption of an agricultural company. During the planning, I also take into consideration the topology of the internal network. After that I build a model in the DIgSILENT PowerFactory software, which is based on the electrical construction plans of the facility. After describing the modelled network, I present the results of the simulations carried out by using a script written in DPL programming language. This script executes load-flow simulations with a 15 minute time resolution. In addition, I define a "shunt" type network element which is a 3-phase delta-connected capacitor bank. I choose the capacity of a single capacitor, in accordance with the smallest unit of the automatic power factor correction device. I also build a "controller" model, which simulates the operation of the power factor controller. The controller switches on and off the capacitor units in order to keep the reactive power consumption between the specified limits. Finally, I analyze the results of the simulations and I make an approximate calculation for the return of costs.