Grid independent operation control unit, power conditioner, and grid independent operation control method
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United States of America
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Jan 14, 2020
Grant Date -
Oct 5, 2017
app pub date -
Feb 10, 2016
filing date -
Feb 10, 2016
priority date (Note) -
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Abstract
A grid independent operation control unit includes a load current estimator to estimate a load current supplied to stand-alone power system in accordance with an output current of the inverter and an output voltage, and a feedback controller configured to PWM control the inverter at a duty ratio feedback calculated to cause the inverter to output an output voltage command value in accordance with the output voltage and the load current. The feedback controller is configured to PWM control the inverter at a duty ratio feedback calculated for output of a normalized output voltage command value obtained by normalizing the output voltage command value with the DC bus voltage in accordance with normalized output voltage obtained by normalizing the output voltage with the DC bus voltage and normalized load current obtained by normalizing the load current with the DC bus voltage.
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