Unintentional islanding phenomenon has been one of the most important problems of photovoltaic gridconnected converters. However

non-detection zone possibilities exist in the traditional phase shift islanding detection methods for paralleled RLC loads. This paper presents an active islanding detection method for gridconnected converters

which is based on the phase shift of the sinusoidal converter output current. The proposed active disturbance rejection islanding detection method can eliminate non-detection zone by introducing a function to break possible stable state operating point even in the worst condition. Meanwhile a methodology to design its parameters is also presented. The ability of the proposed method to achieve the effective detection capability is proved by means of simulation.