Current control of motor drives with output sinewave filter
First Claim
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1. A power conversion system, comprising:
- an inverter comprising a DC input, an AC output, and a plurality of switching devices coupled between the DC input and the AC output and operative according to inverter switching control signals to convert DC electrical power received at the DC input to provide AC electrical output power at the AC output to drive a motor load through an intervening output filter; and
a controller configured to;
compute a control output value according to a current reference value and a current feedback value using a proportional-integral (PI) current regulator implemented by the controller,filter the control output value to compute an inverter output command value using a lag compensator filter implemented by the controller, wherein the lag compensator filter is designed to provide a non-zero amplitude margin below unity at a resonance frequency of a current control loop, andprovide the inverter switching control signals to control the inverter according to the inverter output command value.
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Abstract
Disclosed examples include power conversion systems, methods and computer readable mediums to operate an inverter to drive a motor load through an output filter, in which a control output value is computed according to a current reference value and a current feedback value using a proportional-integral (PI) current regulator, the control output value is filtered using a lag compensator filter to compute an inverter output command value, and the inverter is controlled according to the inverter output command value.
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Citations
15 Claims
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1. A power conversion system, comprising:
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an inverter comprising a DC input, an AC output, and a plurality of switching devices coupled between the DC input and the AC output and operative according to inverter switching control signals to convert DC electrical power received at the DC input to provide AC electrical output power at the AC output to drive a motor load through an intervening output filter; and a controller configured to; compute a control output value according to a current reference value and a current feedback value using a proportional-integral (PI) current regulator implemented by the controller, filter the control output value to compute an inverter output command value using a lag compensator filter implemented by the controller, wherein the lag compensator filter is designed to provide a non-zero amplitude margin below unity at a resonance frequency of a current control loop, and provide the inverter switching control signals to control the inverter according to the inverter output command value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of operating an inverter to drive a motor load through an output filter, the method comprising:
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using a proportional-integral (PI) current regulator implemented by a processor, computing a control output value according to a current reference value and a current feedback value; using the processor, filtering the control output value to compute an inverter output command value using a lag compensator filter implemented by the controller, wherein the lag compensator filter is designed to provide a non-zero amplitude margin below unity at a resonance frequency of a current control loop; and controlling the inverter according to the inverter output command value. - View Dependent Claims (14)
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15. A power conversion system, comprising:
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an inverter comprising a DC input, an AC output, and a plurality of switching devices coupled between the DC input and the AC output and operative according to inverter switching control signals to convert DC electrical power received at the DC input to provide AC electrical output power at the AC output to drive a motor load through an intervening output filter; and a controller configured to; filter a current feedback value to compute a filtered current feedback value using a lag compensator filter implemented by the controller, wherein the lag compensator filter is designed to provide a non-zero amplitude margin below unity at a resonance frequency of a current control loop, compute an inverter output command value according to a current reference value and the filtered current feedback value using a proportional-integral (PI) current regulator implemented by the controller, and provide the inverter switching control signals to control the inverter according to the inverter output command value.
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Specification