| 摘要 |
PROBLEM TO BE SOLVED: To provide a control method of a direct power conversion device with which, when a load of an inverter is light, a maximal value of voltage at both ends of a switching loss can be made different from the maximal value in the case where the load of the inverter is heavy.SOLUTION: An inverter 5 inputs a DC voltage between a first power supply line LH and a second power supply line LL. A capacitor C4 is connected between the first power supply line LH and the second power supply line LL. The capacitor C4 is discharged to the first power supply line LH and the second power supply line LL during a giving term T1 between the giving term T1 and a receiving term T2 which iteratively appear alternately. A reduction amount of voltage at both ends of the capacitor C4 during the giving term T1 is detected. On the basis of the reduction amount, a command il* regarding an increase amount of voltage vc at both ends in the receiving term T2 is calculated in such a manner that an average value vca of the voltage vc at both ends is approximate to an average command vca* regarding the average value. On the basis of the command il*, the capacitor C4 is charged during the receiving term T2. |
