Examination of the low voltage system in the frequency range up to 500 kHz with regard to data transmission by powerline communication

In the common energy supply network the energy is transferred from the high voltage level to the medium voltage grid and further via the low voltage grid to the end customer. This general principle of the power distribution grid and its planning is currently changed especially by means of the increasing number of peripheral producers on the low voltage network. Furthermore, the grid's rising complexity causes a connection between the power supply grid and the information and communication technology. The extreme power fluctuation shows, that greater efforts have to be made to plan and control modern grids. As a result of these variations, voltage may rise above tolerance limit at load reversal. Due to the increase of hardly predictable regenerative energy generation the number of critical operating conditions and grid overload is constantly rising. There is an increase of regenerative energy generation as well as of the use of efficient electronic power switching (e.g. switch-mode power supply) in the low voltage grid. This leads to an increase of harmonics and the necessity to know the exact system status of the low voltage system.