Patent ID: 8482245
Filing Date: 2013-07-09
Classification: B60L,B60W,H01M,H02M,Y02E,Y02T

Abstract:
1. A power conversion device in which an inverter for controlling a load is connected to an alternating current power system, and which is arranged to perform an electric power assist by connecting a direct-current power assist device having a chopper and a charge device, to a direct-current circuit of the inverter, the power conversion device comprising: a setting section for performing a charge control and a discharge control of the charge device; a charge control section configured to perform the charge control based on a charge target value set by the setting section; a discharge control section configured to perform the discharge control based on a discharge target value set by the setting section; and an instantaneous-low high-speed-compensation section configured to estimate an electric power corresponding to a direct-current sensed voltage of the inverter, and to output a value which is obtained by dividing the estimated value by the direct-current sensed voltage, to the discharge control section, the setting section having setting values of a charge start voltage, a charge stop voltage, a non-control voltage region, a discharge stop voltage, and a discharge start voltage, the setting section selecting the setting values in accordance with the sensed value of the direct-current sensed voltage of the inverter, and the setting section outputting the setting values to the charge control section and the discharge control section as the charge target value and the discharge target value.