Computer Applications in Electrical Engineering Minimization of active power losses in a power transmission system- selected aspects of the computation problem scope

The paper presents fundamental problems concerning optimization of reactive power flow at simultaneous minimization of active power losses performed in order to enhance voltage conditions in a power system. Calculations have been done in order to show that adequate control of reactive power production in generators as well as proper transformation ratio control of system transformers can contribute to the reduction of active power losses in the system and ensure adequate voltage conditions in all system nodes. 1. Introductory remarks on the questions of reactive power- flow 1.1. The significance of reactive power for a power system For proper operation of a power system it is necessary that reactive power is kept balanced for both the generation and load. Reactive power compensation is an important element of operating the National Power System (NPS) [2]. Reactive power generates electromagnetic field that is needed for the operation of induction motors and transformers and proper operation of many loads. However, reactive power transmission causes an increase of active power losses and voltage drops as well as a reduction of the active power generation and transmission potential an