Practical examples 87
Current measurement of the grid-side converter
The main circuit of the grid-side converter is shown below. Current is fed to the LCL filter to
compensate the capacitors in no-load situations when current at the input to the converter
(point a) is zero. However, as current is measured at the input of the grid-side converter
(point b), the line current measurement signal indicates compensated current also in no-
load situations. The grid-side converter actual signal 01.06 LINE CURRENT indicates no-
load current and differs from the measured grid current.
Grid-side converter
LCL filter
Auxiliary Measuring Unit (optional)
Main Circuit Interface Board
a b
MCB2
Electrical
power
network
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