Self-sustaining operation control device, power conditioner, and self-sustaining operation control method

摘要

Load current estimator that is incorporated in a distributed power source having an inverter for converting DC bus voltage Vdc and an LC filter, and estimates load current iload supplied to the independent system based on output current iinv and output voltage esd of the inverter And a feedback control unit that PWM-controls the inverter with a duty ratio that is feedback-calculated so that the output voltage command value e * sd is output from the inverter based on the output voltage esd and the load current iload. Based on the normalized output voltage xsd obtained by normalizing the output voltage esd with the DC bus voltage Vdc and the normalized load current xload obtained by normalizing the load current iload with the DC bus voltage Vdc, the output voltage command value e * sd is converted into the DC bus voltage. A feedback operation is performed so that a normalized output voltage command value x * sd normalized by Vdc is output. Autonomous operation control device for PWM controlling said inverter in Ti ratio u * d.