Some specialists claim that present power systems
come to the end. The first of all reason is fossil fuels run low.
One of the solutions allows avoiding the problem is local
balancing of power production and power demand. The
easiest to reach local non fossil carriers are wind, sun and
water and biomass energy. But they are unstable and it is
very hard to produce stable power from them. Microgrids
were developed to solve the problem. The microgrid is small
power system composed of power plants, controlled and
uncontrolled loads and control system (just like in classic,
huge power system). Because microgrid is rather small it
has to be an automatic and operate without any staff. Hence,
many electronic devices are necessary. First of all these are
power plants controllers. The plants using in the microgrid
are electronic devices. Also some loads are connected
through electronic connection units. Power electronic
converters are the most important part of both plants and
connections. The paper discusses some problems of power
electronic converters in author's DC microgrid. The
converters are divided into groups depending of their
destination. The main groups are presented in more details.