Application Examples; Grid Converter Control; Line Filter Energization And Transformer Magnetization - Danfoss iC7 Series Operating Manual

Operating Guide | Voltage Measurement Option OC7V0

Application Examples

6

Grid Converter Control

6.1
The grid converter consists of a 3-phase inverter, a control unit, and an LCL filter.
Figure 10: Grid Converter with LCL Filter
A
DC bus
C
AC Grid
E
Control unit
The LCL filter can be replaced with an LC filter and a dedicated transformer as shown in
Figure 11: Grid Converter with LC Filter and Transformer
A
DC bus
C
AC Grid
E
Control unit

Line Filter Energization and Transformer Magnetization

6.2
The grid converter can charge the filter capacitors, magnetize the transformers, and synchronize the voltage measured from the grid side
of the main circuit breaker. Thus the inrush currents and voltage transients occurring after the breaker closure are effectively avoided by
using the Voltage Measurement Option OC7V0.
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B
Inverter
D
Voltage Measurement Option OC7V0
Figure 11.
B
Inverter
D
Voltage Measurement Option OC7V0
AQ476649821259en-000101 / 136R0332