| 摘要 |
PURPOSE:To provide a power source unit which has been improved in stability and reliability and rapidly controls cross current in parallel operation, when switching is made through the parallel operation between an electric power convertor and other AC sources. CONSTITUTION:An electric current sensor means 17 which detects AC current I1 from an electric current convertor 1 (inverter), a comparator 18 which decides that AC current has exceeded a specified value and a regulation input means 19 which, in response to output signal C from the comparator, takes in effective component of AC electric power P1 from the electric current convertor are provided. When the AC current exceeds the specified value, synchronization is rapidly made so that the output frequency f of the electric current convertor agrees to that of the AC power source 2, according to the drooping characteristic corresponding to the effective component of AC electric power, and in individual operation state of the electric current convertor, the output frequency is made to be a specified frequency. |
