| 摘要 |
PURPOSE:To increase or decrease the number of AC power converters which are connected in parallel while the operation of the group of the AC power converters is not interrupted by a method wherein the respective cross-current detecting circuit units of the AC power converters are connected in parallel. CONSTITUTION:As resistors R11, R21 and R31 which have same resistance values are connected to current transformers 11, 21 and 31, voltages which are proportional to the output currents of respective power converters 1, 2 and 3 are obtained between both the terminals of the respective resistors. Further, voltages corresponding to the average values of the voltages obtained between both the terminals of the respective resistors R11, R21 and R31 are obtained at the connection points X11, X21 and X31 of resistors R12, R22 and R32. Further, voltages corresponding to cross-currents are obtained between both the terminals of the resistors R12, R22 and R32 respectively. The voltages corresponding to the currents and the cross-currents which are to be alloted to the respective AC power converters are supplied to the control circuits of the respective AC power converters as control signals to control a load so as to be allotted to the respective AC power converters unifirmly. |
