Modelling, Design and Performance Analysis of LCL Filter for Grid Connected Three Phase Power Converters

The use of Power Converters to integrate renewable sources of power with the ac grid has been on the increase in the last two decades. An LCL filter is often used to interconnect the Power Converters to the utility grid in order to filter the high order harmonics produced by the Converter. To achieve the high filtering performance that meet the stringent grid code requirement and also balance cost and effectiveness, an optimal design of the LCL filter is required. This paper presents the modelling and a comprehensive design methodology of an LCL filter for grid – interconnected converters using analytical approach. The simulation results show that with this design method, 99.51% of the current harmonics present at the converter output is mitigated.