| 摘要 |
<P>PROBLEM TO BE SOLVED: To bypass the output of a faulty unit inverter and relatively easily continue operation with the remaining unit inverters. <P>SOLUTION: Each unit inverter 3 has a bypass means 34 for short-circuiting an output and its output voltage is controlled according to a voltage command from a voltage control means 5. The voltage control means 5 includes a voltage reference computation means 52 that computes a voltage reference based on a frequency command and a magnetic flux reference from a magnetic flux reference generating means 51, a voltage limit value computation means 53 that computes a voltage limit value for each phase according to the number of unit inverters whose bypass means 34 is in operation, a voltage limiting means 54 that limits the voltage reference for each phase obtained by the voltage reference computation means 52 by a voltage limit value of the voltage limit value computation means 53, an adding means 55 that adds the output for each phase of the voltage limiting means 54, and an adding means 56 that adds the output of the adding means 55 to the voltage reference for each phase obtained by the voltage reference computation means 52 and corrects it to obtain a voltage command. <P>COPYRIGHT: (C)2010,JPO&INPIT |
