System and method for reactive power regulation
First Claim
1. A system for performing reactive power control, the system comprising:
- a power converter coupled between a power source and an electrical grid, the power converter configured to convert a first form of electric power generated from the power source to a second form of electric power suitable to be distributed by the electrical grid; and
a controller coupled to the power converter, the controller configured to;
monitor the electric power transmitted between the power converter and the electrical grid,decouple a positive sequence component and a negative sequence component from the monitored electric power,perform a positive reactive power control with respect to the positive sequence component by;
generating a first d-axis positive current command according to a monitored DC voltage across a DC link of the power converter and a specified DC voltage command;
generating a first q-axis positive current command according to a calculated feedback positive reactive power and a specified positive reactive power;
regulating the first d-axis positive current command and the first q-axis positive current command to generate a d-axis positive voltage command and a q-axis positive voltage command; and
transforming the d-axis positive voltage command and the q-axis positive voltage command to generate voltage command signals,perform a negative reactive power control with respect to the negative sequence component, andtransmit a control signal to the power converter based on the positive reactive power control and the negative reactive power control to enable the power converter to adjust a reactive power of the electric power transmitted between the power converter and the electrical grid.
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Accused Products
Abstract
A system and method are provided for performing reactive power control. The system includes a power converter and a controller coupled to the power converter. The power converter is configured to convert a first form of electric power generated from the power source to a second form of electric power suitable to be distributed by the electrical grid. The controller is configured to monitor the electric power transmitted between the power converter and the electrical grid. The controller is further configured to decouple a positive sequence component and a negative sequence component from the monitored electric power. The controller is further configured to perform a positive reactive power control and a negative reactive power control with respect to the decoupled positive and negative sequence components. The controller is further configured to transmit a control signal to the power converter based on the positive and negative reactive power control.
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Citations
20 Claims
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1. A system for performing reactive power control, the system comprising:
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a power converter coupled between a power source and an electrical grid, the power converter configured to convert a first form of electric power generated from the power source to a second form of electric power suitable to be distributed by the electrical grid; and a controller coupled to the power converter, the controller configured to; monitor the electric power transmitted between the power converter and the electrical grid, decouple a positive sequence component and a negative sequence component from the monitored electric power, perform a positive reactive power control with respect to the positive sequence component by; generating a first d-axis positive current command according to a monitored DC voltage across a DC link of the power converter and a specified DC voltage command; generating a first q-axis positive current command according to a calculated feedback positive reactive power and a specified positive reactive power; regulating the first d-axis positive current command and the first q-axis positive current command to generate a d-axis positive voltage command and a q-axis positive voltage command; and transforming the d-axis positive voltage command and the q-axis positive voltage command to generate voltage command signals, perform a negative reactive power control with respect to the negative sequence component, and transmit a control signal to the power converter based on the positive reactive power control and the negative reactive power control to enable the power converter to adjust a reactive power of the electric power transmitted between the power converter and the electrical grid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for performing reactive power control with respect to electric power transmitted between a power source and an electrical grid, the method comprising:
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monitoring the electric power transmitted between the power source and the electrical grid; decoupling a positive sequence component and a negative sequence component from the monitored electric power; performing a positive reactive power control with respect to the positive sequence component by generating a first d-axis positive current command according to a monitored DC voltage across a DC link of a power converter and a specified DC voltage command; generating a first q-axis positive current command according to a calculated feedback positive reactive power and a specified positive reactive power; regulating the first d-axis positive current command and the first q-axis positive current command to generate a d-axis positive voltage command and a q-axis positive voltage command; transforming the d-axis positive voltage command and the q-axis positive voltage command to generate voltage command signals; performing a negative reactive power control with respect to the negative sequence component; and adjusting a reactive power of the electric power transmitted between the power source and the electrical grid based on the positive reactive power control and the negative reactive power control. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A system capable of performing reactive power control, the system comprising:
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a power converter, the power converter comprising a machine-side converter and a grid-side converter, the machine-side converter being electrically coupled to a power source for converting alternating current (AC) electric power to direct current (DC) electric power, the grid-side converter being electrically coupled to an electrical grid for converting the DC electric power to AC electric power; and a controller operatively coupled to the grid-side converter, the controller configured to monitor the AC electric power transmitted between the grid-side converter and the electrical grid and to decouple a first sequence component and a second sequence component from a monitored AC electric power, the controller further configured to perform a first reactive power control with respect to the first sequence component to generate a first command signal, the controller further configured to perform a second reactive power control with respect to the second sequence component to generate a second command signal, the controller further configured to transmit a control signal to the grid-side converter in response to the first command signal and the second command signal to enable the grid-side converter to adjust a reactive power of the AC electric power transmitted between the grid-side converter and the electrical grid, wherein the controller comprises; a voltage decoupling circuit configured to decouple a positive sequence voltage component, a negative sequence voltage component, a positive phase angle and a negative phase angle from the monitored AC electric power; a current decoupling circuit configured to decouple a positive sequence current component and a negative sequence current component from the monitored AC electric power using the positive phase angle and the negative phase angle; a power calculating circuit configured to calculate a feedback positive reactive power according to the positive sequence voltage component and the positive sequence current component, and to calculate a feedback negative reactive power according to the negative sequence voltage component and the negative sequence current component; a positive power regulator configured to generate a first d-axis positive current command according to a DC voltage across a DC link of the power converter and a specified DC voltage command and to generate a first q-axis positive current command according to a calculated feedback positive reactive power and a specified positive reactive power command; a positive current regulator configured to regulate the first d-axis positive current command and the first q-axis positive current command to generate a d-axis positive voltage command and a q-axis positive voltage command, and to transform the d-axis positive voltage command and the q-axis positive voltage command to generate voltage commands; and a pulse width modulation (PWM) modulator configured to receive the generated voltage commands and to supply the control signal.
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Specification