Power converter control system observer
AssigneeRockwell Automation Technologies, Inc.
InventorsRobert J. Miklosovic, Ahmed Mohamed Sayed Ahmed
Life of this patent
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Abstract
A system may include a power converter and a control system communicatively coupled to the power converter. The control system may determine a first DC voltage associated with the DC bus based on one or more DC external capacitance values that correspond to one or more loads coupled to the power converter. The control system may also determine a second DC voltage associated with the DC bus based on a capacitance of a system in which the power converter operates. The control system may also determine a third DC voltage associated with the DC bus based on the first DC voltage and the second DC voltage and adjust an operation of the power converter based on the third DC voltage.
Claims20
A system, comprising:
- a power converter configured to convert a first voltage to a second voltage on a direct current (DC) bus, wherein the power converter is part of an industrial automation system for performing one or more industrial operations;
- and
- a control system communicatively coupled to the power converter, wherein the control system is configured to:
- receive a first signal from an ideal system model configured to model one or more expected outputs of the industrial automation system, wherein the first signal corresponds to an estimated output generated by the ideal system model in response to a setpoint input;
- receive a second signal from a power converter model configured to model a non-ideal behavior of the power converter, wherein the second signal corresponds to an actual output generated by the power converter in response to the setpoint input;
- determine a difference between the first signal and the second signal;
- and
- transmit a control signal configured to adjust an operation of the power converter based on the difference.
A method, comprising:
- receiving, by a processor, a first estimated output from an ideal system model configured to model one or more expected outputs of a system, wherein the first estimated output is generated by the ideal system model in response to a setpoint input;
- receiving, by the processor, a second estimated output from a device model configured to model a non-ideal behavior of a device within the system, wherein the second estimated output corresponds to an actual output generated by the device in response to the setpoint input;
- determining, by the processor, a difference between the first estimated output and the second estimated output;
- and
- transmitting, by the processor, a control signal to adjust an operation of the device based on the difference.
A tangible, non-transitory, and machine-readable medium, comprising machine-readable instructions stored thereon that when executed cause a processor to perform operations comprising:
- receiving a first estimated output of a system in response to a setpoint input, wherein the system performs one or more industrial operations, and wherein the first estimated output is determined based at least in part on an ideal model of the system;
- receiving a second estimated output from a non-ideal model of one or more devices within the system in response to the setpoint input, wherein the second estimated output is associated with a non-ideal response of the one or more devices to the setpoint input;
- determining a difference between the first estimated output and the second estimated output to subtract out an error between the non-ideal response of the one or more devices to the setpoint input and an ideal response of the system without the non-ideal response of the one or more devices to the setpoint input;
- and
- transmitting a control signal to adjust an operation of the system based on the difference.
Dependencies are inferred from the claim text.