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US 10,295,581 B2Granted
Voltage sensor-less position detection in an active front end
AssigneeDeere & Company
InventorsTianjun Fu, Long Wu, Kent Wanner, Jason Dickherber, Chris J. Tremel
Life of this patent
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Abstract
A controller including a memory having computer-readable instructions stored therein; and a processor configured to execute the computer-readable instructions to: estimate a synthesized grid voltage vector angle at a terminal of an alternating current (AC) grid based on at least an adjusted angle, to generate Pulse Width Modulation (PWM) signals to control power switches of the AFE inverter based on at least the synthesized grid voltage vector angle, and to control the AFE inverter to exchange power between the AC grid and a load based on the PWM signals.
Claims20
A controller comprising:
- a memory having computer-readable instructions stored therein;
- and
- a processor configured to execute the computer-readable instructions to:
- estimate a synthesized grid voltage vector angle at a terminal of an alternating current (AC) grid by,
- calculating an adjusted angle based on a d-axis voltage and a q-axis voltage, the adjusted angle representing a difference between an Active Front End (AFE) inverter terminal voltage vector angle at a terminal of an AFE inverter and the synthesized grid voltage vector angle due to a voltage drop across an impedance of a filter between the terminal of the AFE inverter and the terminal of the AC grid, the d-axis voltage and the q-axis voltage representing a projection of the AFE inverter terminal voltage vector along a rotating dq-axis, the rotating dq-axis having a d-axis aligned with the synthesized grid voltage vector angle, and
- estimating the synthesized grid voltage vector angle at the terminal of the AC grid based on at least the adjusted angle such that the controller estimates the synthesized grid voltage vector angle to compensate for the voltage drop across the impedance of the filter, the synthesized grid voltage vector angle being an angle associated with a voltage vector of the terminal of the AC grid;
- generate Pulse Width Modulation (PWM) signals to control power switches of the AFE inverter based on at least the synthesized grid voltage vector angle;
- and
- control the AFE inverter to exchange power between the AC grid and a load based on the PWM signals.
6 more elements
A method comprising:
- estimating a synthesized grid voltage vector angle at a terminal of an alternating current (AC) grid by,
- calculating an adjusted angle based on a d-axis voltage and a q-axis voltage, the adjusted angle representing a difference between an Active Front End (AFE) inverter terminal voltage vector angle at a terminal of an AFE inverter and the synthesized grid voltage vector angle due to a voltage drop across an impedance of a filter between the terminal of the AFE inverter and the terminal of the AC grid, the d-axis voltage and the q-axis voltage representing a projection of the AFE inverter terminal voltage vector along a rotating dq-axis, the rotating dq-axis having a d-axis aligned with the synthesized grid voltage vector angle, and
- estimating the synthesized grid voltage vector angle at the terminal of the AC grid based on at least the adjusted angle such that the controller estimates the synthesized grid voltage vector angle to compensate for the voltage drop across the impedance of the filter, the synthesized grid voltage vector angle being an angle associated with a voltage vector of the terminal of the AC grid;
- generating Pulse Width Modulation (PWM) signals to control power switches of the AFE inverter based on at least the synthesized grid voltage vector angle;
- and
- controlling the AFE inverter to exchange power between the AC grid and a load based on the PWM signals.
3 more elements
A controller comprising:
- a memory having computer-readable instructions stored therein;
- and
- a processor configured to execute the computer-readable instructions to:
- estimate a synthesized grid voltage vector angle at a terminal of an alternating current (AC) grid, the synthesized grid voltage vector angle being an angle associated with a voltage vector of the terminal of the AC grid, and the adjusted angle representing a shift in phase angle between an Active Front End (AFE) inverter terminal voltage vector angle at a terminal of an AFE inverter and the synthesized grid voltage vector angle, the AFE inverter terminal voltage vector angle including a first AFE inverter terminal voltage vector angle and a second AFE inverter terminal voltage vector angle, the first AFE inverter terminal voltage vector angle being an angle associated with the voltage vector of the terminal of the AFE inverter at an initial time and the second AFE inverter terminal voltage vector angle being an angle associated with the voltage vector of the terminal of the AFE inverter at a second time subsequent to the initial time, and the processor is configured to estimate the synthesized grid voltage vector angle by:
- estimating the first AFE inverter terminal voltage vector angle when the AFE inverter is disabled,
- estimating a terminal voltage of the AFE inverter when the AFE inverter is enabled, the terminal voltage of the AFE inverter being a voltage of the terminal of the AFE inverter,
- determining the second AFE inverter terminal voltage vector angle when the AFE inverter is enabled, and
- estimating the synthesized grid voltage vector angle based on the adjusted angle and the second AFE inverter terminal voltage vector angle;
- generate Pulse Width Modulation (PWM) signals to control power switches of the AFE inverter based on at least the synthesized grid voltage vector angle;
- and
- control the AFE inverter to exchange power between the AC grid and a load based on the PWM signals.
8 more elements
Dependencies are inferred from the claim text.