Method and apparatus for controlling power converter with inverter output filter
AssigneeRockwell Automation Technologies, Inc.
InventorsJingbo Liu, Thomas Nondahl, Peter Schmidt, Semyon Royak
Life of this patent
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Abstract
Power converters and methods are presented for driving an AC load connected through an intervening filter circuit, in which at least one filter current or voltage signal or value is determined according to feedback signals or values representing an output parameter at an AC output of the power converter, and AC electrical output power is generated at the AC output based at least partially on the at least one filter current or voltage signal or value.
Claims20
A power conversion system for driving a load through an intervening filter circuit, the power conversion system comprising:
- an inverter comprising a DC input, an AC output, and a plurality of switching devices coupled between the DC input and the AC output and operative according to inverter switching control signals to convert DC electrical power received at the DC input to provide AC electrical output power at the AC output;
- a controller configured to determine at least one filter current or voltage signal or value representing a filter capacitor current or filter inductor voltage of the intervening filter circuit based on at least one inverter output feedback signal or value representing an output current at the AC output of the inverter, and to provide the inverter switching control signals to the inverter at least partially according to the at least one filter current or voltage signal or value.
A method for controlling an AC electric motor connected to a motor drive through an intervening filter circuit, the method comprising:
- determining at least one filter current or voltage signal or value representing a filter capacitor current or filter inductor voltage of the intervening filter circuit based on at least one motor drive output feedback signal or value representing an output current at an AC output of the motor drive;
- and
- generating AC electrical output power at an AC output of the motor drive at least partially according to the at least one filter current or voltage signal or value.
A non-transitory computer readable medium with computer executable instructions for controlling an AC electric motor connected to a motor drive through an intervening filter circuit, the computer readable medium comprising computer executable instructions for:
- determining at least one filter current or voltage signal or value representing a filter capacitor current or filter inductor voltage of the intervening filter circuit based on at least one motor drive output feedback signal or value representing an output current at an AC output of the motor drive;
- and
- generating AC electrical output power at an AC output of the motor drive at least partially according to the at least one filter current or voltage signal or value.
Dependencies are inferred from the claim text.