| 摘要 |
PROBLEM TO BE SOLVED: To obtain a system-interconnection inverter apparatus by which an individual operation can be detected surely even when many apparatuses are operated in parallel. SOLUTION: A receiving circuit 13 which receives a radio or television time signal or standard radio waves such as JJY radio waves, JG2AS radio waves or the like transmitted from the Communication Research Laboratory, the Ministry of Posts and Telecommunications, is provided. In addition, a control circuit 14 or the like which is operated at a frequency having a periodic bias with reference to a system frequency so as to be synchronized with the received time signal or the like and which turns off a relay 4 so as to separate an inverter 3 from an AC power system, when the cycle of a system voltage which is found on the basis of a detected system voltage becomes a prescribed value or lower or the prescribed value or higher is provided. As a result, even when many apparatuses are operated in parallel, the direction and the timing of biases of all system-interconnection inverter apparatuses can be synchronized, and the service interruption of an AC power supply can be detected surely. |
