| 摘要 |
To provide a three-level power conversion apparatus which can suppress fluctuation in a neutral point voltage even when operated as a reactive power regulator. The three-level power conversion apparatus is composed of first and second three-level converters 2A, 2B connected to an AC power supply system, positive side and negative side DC capacitors 3P, 3N, a three-level inverter 4 to drive an AC motor 5, and converter control means 10 for controlling the three-level converters 2A, 2B. The converter control means 10 has first and second reactive current control means 15A, 15B for controlling so that reactive portions of input currents of the three-level converters 2A, 2B become a prescribed reactive current reference, respectively, first and second neutral point voltage fluctuation suppressing means for controlling PWM control means 17A, 17B, respectively, so as to make a difference between voltages applied to DC capacitors 3P, 3N to be zero, and active current control means for supplying a prescribed circulating active current from the three-level converter 2A to the three-level converter 2B. |
