What is the difference between Impedance network and LCL filter in the grid connected inverter?

Sivaraman Pandarinathan @Sivaraman-Pandarinathan

27 August 2013 1 7K Report

We use impedance network (DC side) in front of inverter and filters like [ L (or) LC (or) LCL ] after the inverter ( i.e AC side) which is connected to grid (or) local load. What is the difference between those two, in view of design and function?

Punit Kumar

The dc side impedance networks provides the unique features which can help boost or buck the voltage as compared to VSI. The filters used on load side are to filter current ripples to make the output pure sine wave. Go through the articles on ZSI, you will get to know.

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