Controlling system for dispersed power supply in distribution system

PURPOSE: To maintain the voltage of a distribution system within a proper range when a dispersed power supply is connected to the distribution system and operated. CONSTITUTION: Dispersed power supplies 9a, 9b are connected to a distribution line 7b directly or through an AC converter 10. A voltage time waveform V 2 and a current time waveform I 2 in the vicinity of the node of the distribution line 7b and a current time waveform I d2 delivered between the distribution line 7b and the dispersed power supply 9b are detected by a voltage sensor 11 and current sensors 12, 13 and taken into a conatroller 14 at the time of the dispersed power supply 9b. A voltage value on the secondary side, the distribution system side, of a transformer 3 for the distribution of electrical energy is also detected by a voltage sensor 17 and taken into the controller 14. The controller 14 controls the dispersed power supplies 9a, 9b or the AC converter 10 on the basis of these input information. Accordingly, the voltage of a distribution system can be maintained within a proper range. COPYRIGHT: (C)1993,JPO&Japio