| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress voltage flicker and to compensate reduced power factor. <P>SOLUTION: A control device comprises: a reactive power detection circuit 10; a firing angle control circuit 12; reactive power compensation device models 141-143 and system models 151-153 for generating plural system voltages based on plural firing angles generated from reactive power of a load; a selection circuit 17 that selects an optimum compensation gain K in which flicker voltage is minimum; and a gain multiplier 11 that adjusts the output of the reactive power detection circuit 10 using the gain K. The control device further comprises: a separation calculator 21 that separates the reactive power into a fixed portion and a variable portion; gain multipliers 111-113 that multiply the variable portion by the plural gains; and adders 221-223 that add the fixed portion to the multiplication result. An optimum compensation gain K is calculated based on plural firing angles α<SB POS="POST">1</SB>-α<SB POS="POST">3</SB>generated from the outputs of the adders 221-223, a multiplication result of the gain K and the variable portion is added to the fixed portion, and the result is input to the firing angle control circuit 12. <P>COPYRIGHT: (C)2012,JPO&INPIT |
