3
MVW01 WITH 3 LEVELS (3L)
3 MVW01 WITH 3 LEVELS (3L)
The 3 level MVW01 is a variable frequency inverter destined to control medium voltage motors with nominal voltages of 2300 V, 3300 V, 4160
V and 4600 V and with a power range from 540 HP to 30690 HP. In its standard version it uses non-controlled semiconductors (diodes) at the
input rectifier stage and controlled semiconductors (HV-IGBTs) to generate the three output phases at the inverter stage, in order to control the
medium voltage motor speed and torque.
The MVW01 presents protections against overload, short-circuit, phase loss, undervoltage, overvoltage, overtemperature, and ground fault, it
also has an independent fault monitoring for each HV-IGBT. The control type can be selected by the user, between scalar control (constant V/f
ratio) and vector control (with sensorless or encoder feedback).
Input
transformer
Diode input
rectifier (12,
18 or 24 pulse)
DC link
capacitors
Multilevel inverter
NPC 3 or 5 levels
MVW01
Mains supply: up to 22 kV 3~50/60 Hz
Input cubicle
Main circuit breaker
or contactor
Figure 3.1: General block diagram
The input stage rectifier is a 12-pulse diode bridge (it can be supplied optionally for 18 or 24 pulses). This bridge feeds the inverter DC link. An
isolation transformer is required to feed it in addition to a medium-voltage circuit breaker. Both the transformer and the circuit breaker may be
within the scope of the MVW01 supply. The minimum specifications of the input transformer are:
Nominal power according to the inverter power rating considering the input current harmonics.
Minimum impedance of 6 %.
Shield between primary and secondary windings.
Primary voltage according to the available line voltage.
Secondary voltages according to the motor nominal voltage and 3.6 kV/7.2 kV voltage insulation class.
MVW01 | 3-1
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