Abstract
Synchronization is necessary for grid-connected islanded microgrid connection, but the existing methods solve the problem with high harmonics in the signal. Also, in many studies, the microgrid’s imbalanced voltage and frequency change rate is obtained by the sensor network or synchronizing relays, which is expensive. Hence to solve the problem, the paper introduced the automatic adaptive synchronization (A2S) scheme by using optimization and control techniques to synchronize the microgrid with the decentralized generators. The multiple decentralized generators serve the load through the microgrid, the voltage and phase are synchronized with the adaptive neuro-fuzzy inference system (ANFIS). The imbalance among them is sensed by the rain optimization algorithm (ROA). Thus the sensed changes are fed to the controller to provide gating signals accordingly to the cascaded H-bridge multi-level inverter with reduced harmonics. The distributed generator feeds the load through the 14 km feeder line and synchronizes the three-phase voltage at 1.9 ms with 2.28% distortion.
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