| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a parallel AC power supply system of a master-slave system in which an electric power is stably supplied to a load even if a master stops due to failure, etc. <P>SOLUTION: In this control method, an inverter 2a and a controller 9a, for example, operate as a voltage source (master) while inverters 2b and 2c and controllers 9b and 9c operate as a current source (slave). Here, a fluctuation tolerance range for a different frequency and voltage effective value is set for each current source, and if a frequency or voltage at a grid point exceeds the fluctuation tolerable range, the voltage source is judged to be defective. And a corresponding controller switches function so that a corresponding inverter operates as a voltage source, resulting in allowing a stable power to be supplied to a load. <P>COPYRIGHT: (C)2004,JPO |
