POWER CONVERSION DEVICE

A power conditioner that includes a voltage detection unit that detects a voltage value of output voltage of the power conditioner, a current detection unit that detects a current value of output current of the power conditioner, and a constant power factor control unit that performs a constant power factor control process of a power factor of output power of the power conditioner to become a preset power factor command value. The constant power factor control unit performs the constant power factor control process using the detected voltage and current values at a second moment in past, the second moment in past being earlier than a first moment by a preset reference time period, and the first moment being a moment at which the voltage and current values are acquired for performing the constant power factor control process.