Power conversion system control device
AssigneeDenso Corporation
InventorsSeiji Iyasu, Yuji Hayashi, Yuichi Handa
Life of this patent
Estimating the term…
Abstract
A control device is applied to a power conversion system including a first DDC and a second DDC connected in parallel with a common power supply target. The control device performs the equalization control of correcting, with an output correction voltage, at least any of a voltage command value of the first DDC and a voltage command value of the second DDC to equalize an output current. Moreover, while the equalization control is being performed, it is determined on which one of an output side of the first DDC or an output side of the second DDC abnormal disconnection has been caused based on the output correction voltage.
Claims7
A power conversion system control device applied to a power conversion system including a first power conversion device and a second power conversion device connected in parallel with a common power supply target, comprising:
- an equalization control unit configured to perform an equalization control of correcting, with an output correction voltage, at least any of a voltage command value of the first power conversion device and a voltage command value of the second power conversion device to equalize an output current;
- an abnormal disconnection determination unit configured to determine, based on the output correction voltage, on which one of an output side of the first power conversion device or an output side of the second power conversion device abnormal disconnection has been caused while the equalization control is being performed;
- a first output current acquisition unit configured to acquire a first output current supplied from the first power conversion device to the power supply target;
- a second output current acquisition unit configured to acquire a second output current supplied from the second power conversion device to the power supply target;
- and
- a gradient value calculation unit configured to calculate a gradient value of the output correction voltage with respect to a change in the first output current or the second output current,
- wherein the abnormal disconnection determination unit determines, based on the calculated gradient value, on which one of the output side of the first power conversion device or the output side of the second power conversion device the abnormal disconnection has been caused.
A power conversion system control device applied to a power conversion system including a first power conversion device and a second power conversion device connected in parallel with a common power supply target, comprising:
- an equalization control unit configured to perform an equalization control of correcting, with an output correction voltage, at least any of a voltage command value of the first power conversion device and a voltage command value of the second power conversion device to equalize an output current;
- an abnormal disconnection determination unit configured to determine, based on the output correction voltage, on which one of an output side of the first power conversion device or an output side of the second power conversion device abnormal disconnection has been caused while the equalization control is being performed;
- an inter-terminal voltage acquisition unit configured to acquire an inter-terminal voltage of a storage battery, the power supply target being the storage battery;
- and
- a battery correction voltage calculation unit configured to calculate a battery correction voltage for correcting a battery voltage command value as an operation amount for a control of feeding back the inter-terminal voltage to the battery voltage command value,
- wherein in a case where it is not, based on the output correction voltage, determined that the abnormal disconnection has been caused on the output sides of the first power conversion device and the second power conversion device and it is determined that the battery correction voltage is an abnormal value, the abnormal disconnection determination unit determines that the abnormal disconnection has been caused on both of the output side of the first power conversion device and the output side of the second power conversion device.
Dependencies are inferred from the claim text.