Isolated operation detecting method, control apparatus for detecting isolated operation for distributed power supply, isolated operation detecting apparatus, and distributed power supply

摘要

An isolated operation detecting method according to the present invention includes: a first step that injects a power fluctuation into the power system; a second step that measures a system cycle; a third step that adjusts the injection of the power fluctuation so that the system cycle increases when the system cycle is found increased than the previous system cycle as a result of the measuring, and decreases when the system cycle is found decreased than the previous system cycle; a fourth step that produces a change pattern of a latest system cycle on the basis of a deviation of the latest system cycle from a fixed number of cycle -passed previous system cycle; and a fifth step that determines an isolated operation on the basis of the change pattern.