Joon Young Park, Seok-Min Kim, SeungGyu Seo, Seong-Soo Park, and Kyo-Beum Lee, "Design of an LCL-Filter for Grid-Connected Three-Level Inverter System," Journal of Institute of Korean Electrical and Electronics Engineers, vol. 21, no. 2, pp. 105–114, Jun. > Paper

This paper proposes a design method of an LCL-filter for grid-tied three-level inverter systems. The demand for three-phase PWM

inverters in applications such as wind or solar power generation systems has been increase in recent years. To reduce harmonic

components caused by switching operation, such inverters are connected to the grid via an LCL filter. Although there are research

results for designing LCL-filter, the modulation method should be fully considered to make the filter perform desired cancellation ability

with minimized size. This paper presents the design methodology for an LCL-filter that is optimized for SVM switching operations. The

simulation and experimental results verify the validity of the LCL-filter designed with proposed method in this paper.