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The active rectifier has bidirectional power flow capability and the injected reactive
power (grid side) can be defined by the customer.
-
DC/DC output converter: a three-branch IGBT converter allows three buck-boost DC-
DC conversions from the DC bus to each of the output channels. Each channel can be
controlled independently or, by software, the three channels will share the same
operation mode and setpoints.
-
Output LCL filter: this filter reduces voltage distortion (caused by switching) at the
output of the power supply.
-
Output EMI filter: a high frequency common mode LC filter is used to reduce
electromagnetic disturbances at the output of the DCPS.
-
Output protections: the DC outputs are protected by fuses. A disconnector is provided
to isolate the output from the load. Screw terminals are also integrated to connect the
load. Please, follow safety instructions in
Installation
section to connect the power
supply.
2.7.
Principle of operation
Below, a technical diagram of the power supply is shown:
Drivers x6
Drivers x6
Current
sensor x3
Voltage
sensor x2
Voltage
sensor x3
Current
sensor x3
Voltage
sensor x3
PE
-U
-U
PE
PE
EMC
filter
EMC
filter
DC output
1/3 channels
PE
DCPS
U
DSP
board
DSP
board
CAN/
Ethernet
board
CAN
MODBUS/TCP
ETHERNET
V
W
N
PE
R
S
T
N
PE
(Please note that earth protection cable is only connected to the cabinet chassis).
