| 摘要 |
PROBLEM TO BE SOLVED: To reduce distortion in output voltage by suppressing spike voltage caused by a phase error, in a power conversion device which makes output synchronized with a detected phase be generated from each bridge circuit and obtains AC output from a combination of the generated output.SOLUTION: Voltage synchronizing with an AC voltage phase of a power line 3 is output from an inverter unit 11 and is connected to the power line 3. A control device 20 generates a voltage command on the basis of a phase detected by a first detection unit, generates a PWM signal 27a for a first bridge circuit (Q1-Q2) on the basis of the voltage command, and generates a polarity signal 30a for a second bridge circuit (Q3-Q4) on the basis of a phase detected by a second detection unit. A command value correction unit 26 corrects the generated voltage command to 0 V in a first period 26b continuing before a zero cross phase x1 by the first detection unit. A gate-off control unit 30 makes the polarity signal 30a be in an off-state in a second period 30b continuing from a zero cross phase x2 by the second detection unit. |
