Skip to main content
APEC 2025 Main banner
Back

Technical Dialogue

Distributed Energy Systems

D20.7 - LCL Filter Parameter Selection using Graphical Method for a 13.8 kV ac 1.1 MVA 7-Level Flying Capacitor Grid-Connected Converter Utilizing Variable Switching Frequency

Thursday, March 20, 2025
11:30 AM – 1:30 PM ET
Location: Level One, Hall A3
The LCL filter is widely used in dc to ac power converters due to its ability to provide higher attenuation at high frequencies, favorable inductor size trade-off and enhanced system dynamics response. This is particularly advantageous in renewable energy and grid-connected applications which require compliance with power quality standards (e.g. IEEE Std 519 and IEEE Std 1547). While the design procedure for LCL filters is extensively discussed, existing methods often focus their consideration on 2-level or 3-level neutral point clamped converters, constant switching frequency, and passive damping. This paper presents a LCL filter graphical method design procedure for a 1.1 MVA 13.8 kV ac 22 kV dc 7-level Flying Capacitor Grid-Connected Converter based on 10 kV SiC MOSFETs that accounts for any number of levels, variable switching frequency, and active damping. This graphical method can help designers iterate on their design and select the optimal filter parameters.