| 摘要 |
PROBLEM TO BE SOLVED: To obtain a parallel operation controller for single-phase power converters which will not need a communication means by which operation state data are exchanged between the single-phase power converters. SOLUTION: A DC component P1D of an active power P1, outputted from a single phase power conversion circuit unit 2, is detected by an active power DC component detector 14 and a result, obtained by deducting the DC component P1D from an active power reference P1R, is multiplied by a value GP in a gain unit 16 to obtain a frequency correction value Δf1. A sine wave is obtained from an output frequency f1, obtained by adding a standard frequency command f*1 to the frequency correction value Δf1, and further, an output voltage command V*1 is obtained and supplied to the output voltage control unit 6 of the single-phase power conversion circuit unit 2. With such a constitution, characteristics that, if the active power P1 of the single- phase power conversion circuit unit 2 is large, the output frequency f1 is small, can be obtained. If there is unbalance between the output voltages of two parallel-connected single phase power converters, the output frequency of the single-phase power conversion circuit unit 2 with the larger active power is reduced, and the output voltage of the single-phase power converter with smaller active power is increased. |
