ISLANDING OPERATION DETECTION DEVICE, ISLANDING OPERATION DETECTION METHOD, AND POWER CONDITIONER WITH ISLANDING OPERATION DETECTION DEVICE

To provide an islanding operation detection device that does not induce a voltage flicker phenomenon.SOLUTION: An islanding operation detection device 3 for detecting islanding operation of a power conditioner 1 comprises: an operating power source detection unit 31 for detecting whether or not operating power sources B of a specific number or more are connected to a distribution system C to which the power conditioner 1 is connected; an active detection unit 32 for actively detecting islanding operation by injecting a first active signal into the distribution system C; a passive detection unit 33 for detecting islanding operation on the basis of a variation in electric characteristics generated caused by an injection of a second active signal into the distribution system C by another islanding operation detection device arranged in the distribution system C; and a change-over unit 36 for changing over between the active detection unit 32 is in a functioning state and in a nonfunctioning state in response to a detection result of the operating power source detection unit 31.SELECTED DRAWING: Figure 1 【課題】電圧フリッカ現象を誘発しない単独運転検出装置を提供する。【解決手段】パワーコンディショナ１の単独運転を検出する単独運転検出装置３において、パワーコンディショナ１が接続されている配電系統Ｃに規定以上の稼働電源Ｂが接続されているか否かを検出する稼働電源検出部３１と、第１能動信号を配電系統Ｃに注入することで、能動的に単独運転を検出する能動検出部３２と、配電系統Ｃに配置された他の単独運転検出装置が当該配電系統Ｃに第２能動信号を注入したことによって生じた電気的な特性の変化に基づいて、単独運転を検出する受動検出部３３と、稼働電源検出部３１の検出結果に応じて、能動検出部３２を機能させる状態と機能させない状態とで切り替える切替部３６とを備えた。【選択図】図１