POWER CONVERSION DEVICE

A power conversion device has a power converter having a switching element and a control unit for controlling the power converter on the basis of the voltage information and current information of an induction motor. The control unit calculates first power information on the basis of the voltage information and current information of the induction motor, calculates second power information on the basis of an electric circuit constant of the induction motor, a current command value, an output frequency command value, and a magnetic flux estimated value, and calculates the magnetic flux estimated value so that the second power information follows the first power information. 本发明的电力转换装置包括：具有开关元件的电力转换器；和基于感应电动机的电压信息和电流信息来控制电力转换器的控制部，控制部运算从感应电动机的电压信息和电流信息运算得到的第一电功率信息，并从感应电动机的电路常数、电流指令值、输出频率指令值和磁通推算值运算第二电功率信息，控制部以使第二电功率信息追随第一电功率信息的方式运算磁通推算值。