Abstract
For the energy router (ER) switching on/off frequently to select the optimal route, this study mainly solves the problem of on/off-grid switching and islanding detection of grid-connected inverters on the AC side of ERs. A control strategy based on disturbance observer is proposed to suppress the disturbance of the output current to the output voltage. At the same time, the improved pre-synchronisation method is used to achieve fast synchronisation of voltage amplitude and phase. Then, an improved frequency-shift method is proposed for islanding and non-detection zone detection for droop control grid-connected inverters. Finally, the proposed methods are verified by simulation and experiments.
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