SYSTEM INTERCONNECTION DEVICE FOR DISTRIBUTED POWER SOURCES

To determine a deposition of a relay for system interconnection at relatively low cost in the case of power failure in a system interconnection device for distributed power sources.SOLUTION: In a system interconnection device 10, a first parallel-off relay 15a provided in a first electric wire L1 is connected to a second electric wire L2 via a second connection electric wire 24 in which a first energy consumption component 24a consuming electric energy charging a capacitor 14c is provided, when switched to a second connection state. A second parallel-off relay 15b provided in the second electric wire L2 is connected to the first electric wire L1 via a third connection electric wire 25 in which a second energy consumption component 25a consuming electric energy charging the capacitor 14c is provided, when switched to the second connection state. On the basis of a detected current state or a detected voltage state during discharge of the capacitor 14c, a determination section 16b determines a deposition state of the first and second parallel-off relays 15a and 15b.SELECTED DRAWING: Figure 1 【課題】分散型電源の系統連系装置において、停電時において比較的低コストにて、系統連系用継電器の溶着判定を行なう。【解決手段】系統連系装置１０において、第１電線Ｌ１に設けた第１解列リレー１５ａは第２接続状態に切り替えられたとき、コンデンサ１４ｃに充電された電気エネルギを消費する第１エネルギ消費部品２４ａが設けられた第２接続電線２４を介して第２電線Ｌ２に接続される。第２電線Ｌ２に設けた第２解列リレー１５ｂは第２接続状態に切り替えられたとき、コンデンサ１４ｃに充電された電気エネルギを消費する第２エネルギ消費部品２５ａが設けられた第３接続電線２５を介して第１電線Ｌ１に接続される。溶着判定部１６ｂは、コンデンサ１４ｃの放電時の検出電流状態または検出電圧状態に基づいて、第１および第２解列リレー１５ａ，１５ｂの溶着状態を判定する。【選択図】 図１