LCL filter design for a modular power conditioning system with uninterruptible power supply capability

Low power quality and supply reliability within industrial grids cause severe economic damage to Europe's key industry sectors. A modular shunt connected power conditioning systems with the objective of locally improving quality of supply within industrial grids has been proposed. One of its voltage-fed power converter based modules implements functionalities which are comparable to those of well known line interactive uninterruptible power supply systems. This paper discusses the input filter topology choice, its application specific design and points out contrasts to optimization criteria derived for the LCL filter design of converters for permanent grid-connected operation.