A HIGH POWER QUALITY ANTI-ISLANDING METHOD USING EFFECTIVE POWER VARIATION

摘要

A high power quality islanding detecting method using effective power variation is provided to alleviate impact on a commercial system by applying a current having a designed value for a predetermined time. A high power quality islanding detecting method using effective power variation includes the steps of: matching zero crossing of output voltage through data sampling(S100,S110); periodically varying output current of an inverter in the zero crossing state(S120); varying the output voltage according to the variation of the output current; and detecting islanding by using an active frequency drift of the output current when varying the output voltage.