Systems and methods for controlling inverters
First Claim
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1. A method of controlling an inverter, comprising:
- receiving a target waveform for output voltage of an inverter phase;
calculating a phase bias for an inverter phase using the target waveform;
biasing the target waveform using the phase bias; and
generating a switching device command signal by comparing the biased target waveform to a carrier waveform, wherein the switching device command signal reduces midpoint current in an inverter input lead and common mode voltage in an inverter output lead,wherein calculating the phase bias further comprises comparing an uncompensated midpoint duty cycle to a target midpoint duty cycle for a phase of the inverter, andwherein the uncompensated midpoint duty cycle for a phase of the inverter is calculated by consolidating output of low and high saturation blocks using the target waveform.
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Abstract
A method of controlling an inverter includes receiving a target waveform for output voltage of an inverter phase, calculating a phase bias for an inverter phase using the target waveform, biasing the target waveform using the phase bias, and generating a switching device command signal by comparing the biased target waveform to a carrier waveform. The switching device command signal has a switching patter that reduces midpoint current in an inverter input lead and common mode voltage in an inverter output lead.
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Citations
12 Claims
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1. A method of controlling an inverter, comprising:
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receiving a target waveform for output voltage of an inverter phase; calculating a phase bias for an inverter phase using the target waveform; biasing the target waveform using the phase bias; and generating a switching device command signal by comparing the biased target waveform to a carrier waveform, wherein the switching device command signal reduces midpoint current in an inverter input lead and common mode voltage in an inverter output lead, wherein calculating the phase bias further comprises comparing an uncompensated midpoint duty cycle to a target midpoint duty cycle for a phase of the inverter, and wherein the uncompensated midpoint duty cycle for a phase of the inverter is calculated by consolidating output of low and high saturation blocks using the target waveform. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of controlling an inverter, comprising:
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receiving a target waveform for output voltage of an inverter phase; calculating a phase bias for an inverter phase using the target waveform; biasing the target waveform using the phase bias; and generating a switching device command signal by comparing the biased target waveform to a carrier waveform, wherein the switching device command signal reduces midpoint current in an inverter input lead and common mode voltage in an inverter output lead, wherein calculating the phase bias further comprises comparing an uncompensated midpoint duty cycle to a target midpoint duty cycle for a phase of the inverter, and wherein the target midpoint duty cycle is calculated by inverting and biasing a maximum of the absolute value of the plurality of target waveforms.
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9. A control system for an inverter, comprising:
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a processor; and a memory communicative with the processor, wherein the processor has instructions recorded thereon that, when read by the processor, cause the processor to; receive a target waveform representative of output voltage of an inverter phase; calculate a phase bias for an inverter phase using the target waveform; bias the target waveform using the phase bias; and generate a switching device command signal by comparing the biased target waveform to a carrier waveform, wherein the switching device command signal reduces midpoint current in an inverter input lead and common mode voltage in an inverter output lead, wherein the phase bias is calculated by comparing an uncompensated midpoint duty cycle to a target midpoint duty cycle for a phase of the inverter, and wherein the uncompensated midpoint duty cycle for a phase of the inverter is calculated by consolidating output of low and high saturation blocks using the target waveform. - View Dependent Claims (10, 11)
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12. A control system for an inverter, comprising:
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a processor; and a memory communicative with the processor, wherein the processor has instructions recorded thereon that, when read by the processor, cause the processor to; receive a target waveform representative of output voltage of an inverter phase; calculate a phase bias for an inverter phase using the target waveform; bias the target waveform using the phase bias; and generate a switching device command signal by comparing the biased target waveform to a carrier waveform, wherein the switching device command signal reduces midpoint current in an inverter input lead and common mode voltage in an inverter output lead, wherein the phase bias is calculated by comparing an uncompensated midpoint duty cycle to a target midpoint duty cycle for a phase of the inverter, and wherein the target midpoint duty cycle is calculated by inverting and biasing a maximum of the absolute value of the plurality of target waveforms.
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Specification