| 摘要 |
PURPOSE:To provide an inverter unit for system interconnection in which economization suitable for low capacity system interconnection and simplification of control circuit are realized by constituting the control circuit and an inverter section with existing technology employing no operating circuit. CONSTITUTION:A triangular wave signal synchronous with a commercial power supply 1 is generated from a triangular wave generating section 31 and a DC signal corresponding to inverter output power is detected at an output power detecting section 33. Cross point of the triangular wave signal and the DC signal is detected through a comparator 318 and a rectangular wave signal, which is inverted at the cross point, is generated from a waveform converter 317. The rectangular wave signal is employed for driving an inverter section 30 through a driving circuit 313. Output voltage from a system interconnection inverter 3 is controlled by varying the level of the DC signal to shift the cross point thereby varying the phase of the rectangular wave signal with respect to the comercial power supply 1. Since no operating circuit is employed in the unit, economization is realized and the control circuit is simplified. |
