| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a controller for inverters that includes two or more inverters for supplying alternating-current power to a power system connected in parallel thereto and controls the output of each inverter, wherein it is possible to control voltage without dissipating the output of each inverter even though there is any error in voltage detection values used to control each inverter. <P>SOLUTION: A control circuit 1 includes two inverters 4, 4T for supplying alternating-current power to an alternating-current bus BS connected in parallel thereto and controls the output of the inverter 4 to be controlled by the control circuit. It detects the output voltage value Ia(t) of the inverter 4 by a current detector 7a and computes the difference between a voltage command value Vref and the output voltage value Ia(t). Based on this difference, it controls voltage by a proportional plus integral circuit 21. When the parallel inverter 4T is in operation, the control circuit inputs the output of the proportional plus integral circuit 21 to a proportional circuit 22 and subtracts a value output from the proportional circuit 22 from the voltage command value Vref to correct it. <P>COPYRIGHT: (C)2010,JPO&INPIT |
