Voltage sensor-less position detection in an active front end
First Claim
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1. 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 without using physical voltage sensors at the terminal of the AC grid by,estimating a terminal voltage of an Active Front End (AFE) inverter when the AFE inverter is enabled, the terminal voltage of the AFE inverter being a voltage of a terminal of the AFE inverter,estimating a first AFE inverter terminal voltage vector angle when the AFE inverter is disabled, 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,determining a second AFE inverter terminal voltage vector angle when the AFE inverter is enabled, 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, andestimating the synthesized grid voltage vector angle based on the second AFE inverter terminal voltage vector angle, the synthesized grid voltage vector angle being an angle associated with a voltage vector at the terminal of the AC grid;
generate Pulse Width Modulation (PWM) signals to control power switches of the AFE inverter based on at least (i) the synthesized grid voltage vector angle at the terminal of the AC grid and (ii) a AC grid terminal reference power factor, the AC grid terminal reference power factor representing a desired phase shift between the voltage vector and a current vector at the terminal of the AC grid; and
control the AFE inverter to supply power to a load based on the PWM signals.
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Abstract
A controller may include a memory having computer-readable instructions stored therein; and a processor configured to execute the computer-readable instructions to generate Pulse Width Modulation (PWM) signals to control power switches of an Active Front End (AFE) inverter based on at least a synthesized grid voltage vector angle at a terminal of an alternating current (AC) grid without using physical voltage sensors at the terminal of the AC grid, and control the AFE inverter to supply power to a load based on the PWM signals.
37 Citations
20 Claims
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1. A controller comprising:
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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 without using physical voltage sensors at the terminal of the AC grid by, estimating a terminal voltage of an Active Front End (AFE) inverter when the AFE inverter is enabled, the terminal voltage of the AFE inverter being a voltage of a terminal of the AFE inverter, estimating a first AFE inverter terminal voltage vector angle when the AFE inverter is disabled, 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, determining a second AFE inverter terminal voltage vector angle when the AFE inverter is enabled, 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 estimating the synthesized grid voltage vector angle based on the second AFE inverter terminal voltage vector angle, the synthesized grid voltage vector angle being an angle associated with a voltage vector at the terminal of the AC grid; generate Pulse Width Modulation (PWM) signals to control power switches of the AFE inverter based on at least (i) the synthesized grid voltage vector angle at the terminal of the AC grid and (ii) a AC grid terminal reference power factor, the AC grid terminal reference power factor representing a desired phase shift between the voltage vector and a current vector at the terminal of the AC grid; and control the AFE inverter to supply power to a load based on the PWM signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of generating Pulse Width Modulation (PWM) signals for power switches of an Active Front End (AFE) inverter, the method comprising:
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estimating a synthesized grid voltage vector angle at a terminal of an alternating current (AC) grid without using physical voltage sensors at the terminal of the AC grid by, 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 a terminal of the AFE inverter, estimating a first AFE inverter terminal voltage vector angle when the AFE inverter is disabled, 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, determining a second AFE inverter terminal voltage vector angle when the AFE inverter is enabled, 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 estimating the synthesized grid voltage vector angle based on the second AFE inverter terminal voltage vector angle, the synthesized grid voltage vector angle being an angle associated with a voltage vector at the terminal of the AC grid; generating the PWM signals to control the power switches of the AFE inverter based on at least (i) the synthesized grid voltage vector angle at the terminal of the AC grid and (ii) a AC grid terminal reference power factor, the AC grid terminal reference power factor representing a desired phase shift between the voltage vector and a current vector at the terminal of the AC grid; and controlling the AFE inverter to supply power to a load based on the PWM signals. - View Dependent Claims (18, 19)
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20. A controller comprising:
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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 without using physical voltage sensors at the terminal of the AC grid; generate Pulse Width Modulation (PWM) signals to control power switches of an Active Front End (AFE) inverter based on at least (i) the synthesized grid voltage vector angle at the terminal of the AC grid and (ii) a AC grid terminal reference power factor without using physical voltage sensors at the terminal of the AC grid, the AC grid terminal reference power factor representing a desired phase shift between a voltage vector and a current vector at the terminal of the AC grid, wherein the controller is configured to generate the PWM signals by, converting measured current from a measured 3-phase current in a stationary reference frame to a measured direct-quadrature (dq)-axis current in a dq rotating reference frame, generating a q-axis current reference based on the AC grid terminal reference power factor, generating a d-axis current reference based on an actual DC bus voltage and a reference DC bus voltage, the actual DC bus voltage being connected to a load, the d-axis current reference and the q-axis current reference forming a dq-axis current reference, generating dq-axis reference voltages based on the measured dq-axis current in the dq rotating reference frame and the dq-axis current reference, and generating 3-phase gate driving signals for the AFE inverter by converting the dq-axis reference voltages based on the synthesized grid voltage vector angle, the 3-phase gate driving signals being the PWM signals; and control the AFE inverter to supply power to the load based on the PWM signals.
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Specification