The paper discusses the most important areas of application of power electronics arrangements in the Polish electrical power system; especially in the distribution system. The examples presented demonstrate both the need for and the purpose of further research and its applications in these fields, as well as indicating the direction of future research, with special consideration given to the research required in Poland. The proposed practical solutions for power electronics arrangements, either dedicated or capable of adaptation to the distribution systems, illustrate the ability to use the potential of Polish national research-development units.