| 摘要 |
PROBLEM TO BE SOLVED: To control neutral point potential and suppress deterioration in the quality of a system due to increase in reactive power.SOLUTION: In the case where DC voltage deviation exceeds a threshold, when the number of units 5 is 2N, a reactive power command with delay polarity is overlapped with the N units 5 and a reactive power command with progressive polarity is overlapped with the other N units 5. When the number of units 5 is 2N+1, the reactive power command with delay polarity is overlapped with the N+1 units 5 and the reactive power command with progressive polarity is overlapped with the other N units 5, or the reactive power command with delay polarity is overlapped with the N units 5 and the reactive power command with progressive polarity is overlapped with the other N+1 units 5.SELECTED DRAWING: Figure 2 |
