Control of single-phase power converter in D-Q rotating coordinates
First Claim
1. A method for controlling a single-phase converter or a zero-sequence circuit of a three-phase converter, comprising:
- determining imaginary state variables of an imaginary orthogonal circuit, such that the imaginary state variables are orthogonal to real state variables of the converter in stationary coordinates;
transforming the real and imaginary state variables from stationary coordinates to DQ rotating coordinates;
determining real and imaginary duty cycle signals in DQ rotating coordinates;
transforming the real and imaginary duty cycle signals back to stationary coordinates; and
applying the real duty cycle signal to control the converter.
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Abstract
Imaginary orthogonal circuit state variables are established to enable transformation of real circuit state variables of a single-phase converter or the zero-sequence circuit of a three-phase converter from stationary coordinates to DQ rotating coordinates, thereby transforming the sinusoidal steady-state operating point of the real circuit into a DC operating point. A control provides the imaginary circuit state variables in a shifted queue comprising memory blocks for storing quarter-cycle shifted real circuit variables. Control of the converter is thus implemented in rotating DQ coordinates to achieve a theoretically infinite control loop gain at the fundamental frequency.
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Citations
4 Claims
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1. A method for controlling a single-phase converter or a zero-sequence circuit of a three-phase converter, comprising:
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determining imaginary state variables of an imaginary orthogonal circuit, such that the imaginary state variables are orthogonal to real state variables of the converter in stationary coordinates;
transforming the real and imaginary state variables from stationary coordinates to DQ rotating coordinates;
determining real and imaginary duty cycle signals in DQ rotating coordinates;
transforming the real and imaginary duty cycle signals back to stationary coordinates; and
applying the real duty cycle signal to control the converter. - View Dependent Claims (2)
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3. A control for a single-phase converter or a zero-sequence circuit of a three-phase converter, comprising:
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imaginary orthogonal circuit means for determining imaginary state variables of an imaginary orthogonal circuit, such that the imaginary state variables are orthogonal to real state variables of the converter in stationary coordinates;
first transformation means for transforming the real and imaginary state variables from stationary coordinates to DQ rotating coordinates;
compensation means for determining real and imaginary duty cycle signals in DQ rotating coordinates;
second transformation means for rotating the real and imaginary duty cycle signals back to stationary coordinates; and
control means for applying the real duty cycle signal to control the converter. - View Dependent Claims (4)
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Specification