| 摘要 |
<p>PURPOSE: To attain a DC component control and a protective function by providing a parallel operation power system with means for forming a DC component signal, a current difference signal and an error signal, and a DC voltage reducing means and delivering a disconnection signal when the error signal exceeds a threshold. CONSTITUTION: A parallel power system 10 comprising a pair of VSCF channels is provided with DC component filters 22, 24. Detectors 34, 50 detect a differential current between lines 32, 48 to form current difference signals Vic, Vip. An error signal Vep is produced from a DC component signal Vdp and the current difference signal Vip and when a predetermined threshold level is exceeded, a window detector 56 delivers a disconnection signal to a terminal 58. According to the arrangement, a DC component control and a protective function are realized.</p> |
