Reduction of subharmonic oscillation at high frequency operation of a power inverter
First Claim
1. A method of controlling an inverter of an electric motor, the method comprising:
- obtaining stationary frame currents corresponding to an output of the inverter;
extracting stationary frame subharmonic current components from the stationary frame currents;
performing stationary frame current regulation on the stationary frame subharmonic current components, resulting in stationary frame subharmonic adjustment voltage commands; and
adjusting stationary frame fundamental voltage commands with the stationary frame subharmonic adjustment voltage commands.
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Abstract
A control architecture for an electrical inverter includes a synchronous frame current regulator and a stationary frame current regulator. The stationary frame current regulator receives input currents that represent filtered versions of stationary frame currents that correspond to the inverter output currents. The control architecture employs an adaptive filter module that filters the stationary frame currents to remove the fundamental motor frequency component (and its related harmonics), thus extracting any low frequency harmonic components. The stationary frame current regulator processes the low frequency components, while the synchronous frame current regulator processes the fundamental frequency component, resulting in suppression of low frequency oscillations in the inverter output.
13 Citations
20 Claims
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1. A method of controlling an inverter of an electric motor, the method comprising:
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obtaining stationary frame currents corresponding to an output of the inverter; extracting stationary frame subharmonic current components from the stationary frame currents; performing stationary frame current regulation on the stationary frame subharmonic current components, resulting in stationary frame subharmonic adjustment voltage commands; and adjusting stationary frame fundamental voltage commands with the stationary frame subharmonic adjustment voltage commands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A control architecture for an inverter of an electric motor, the control architecture comprising:
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an adaptive filter module configured to extract stationary frame subharmonic current components from stationary frame currents that correspond to an output of the inverter; a stationary frame current regulator coupled to the adaptive filter module, the stationary frame current regulator being configured to generate stationary frame subharmonic adjustment voltage commands in response to the stationary frame subharmonic current components; a current regulator architecture coupled to the stationary frame current regulator, the current regulator architecture being configured to generate stationary frame fundamental voltage commands in response to the stationary frame currents; and an output element coupled to the stationary frame current regulator and to the current regulator architecture, the output element being configured to produce modified stationary frame voltage commands from the stationary frame fundamental voltage commands and the stationary frame subharmonic adjustment voltage commands. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method of controlling an inverter of an electric motor, the method comprising:
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obtaining stationary frame currents corresponding to an output of the inverter, the output including a fundamental frequency component and a subharmonic oscillation component; performing stationary frame current regulation in response to the stationary frame currents to reduce the subharmonic oscillation component; performing synchronous frame current regulation on synchronous frame currents derived from the stationary frame currents; and generating voltage commands for the inverter, the voltage commands being influenced by the stationary frame current regulation and the synchronous frame current regulation. - View Dependent Claims (20)
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Specification