LCL Filter Design with Amorphous Core Inductor for 100 kVA Energy Storage Converter

Abstract

Today, three-phase voltage source converters (VSC) are usually connected to the grid through LCL filters. The design of the LCL filter has a major impact on the overall system performance and, consequently much attention should be given to the selection of basic filter parameters as well as the choice of magnetic materials and dimensions of inductor core. In this paper, the procedure for selecting the basic parameters of LCL filter for a 100 kVA grid-connected converter is described. A simple design procedure for determination of winding turns number and air-gap length of amorphous core inductor is presented. The prototype of three-phase inductor with amorphous core is manufactured in respect to specific constraints. Afterwards, experimental verification of LCL filter performance is carried out using 100 kVA energy storage converter and lithium-ion battery string with capacity of 70 kWh.