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Battery Assisted PV-SHEC System With Resynchronization Capability

Microgrid comprising a hydro generator faces the problems of voltage and frequency variation in the standalone mode of microgrid (SMM) as well as in the resynchronizing mode. A robust control technique is, therefore, required to minimize the deviation of the system attributes from their set quantities. This work harnesses the power extracted from the PV array and hydro generator and it supplies quality power to the loads. Besides, a battery storage is also utilized to handle the deviations, provides frequency regulation and acts as a backup storage. An M-estimate normalized sub-band adaptive filter (MENSA) is utilized to extricate the fundamental constituents of the loads as well as hydro-generator current in order to prevent the harmonics entering the system. Moreover, a quadrature signal filter (QSF) is used to extricate positive sequence voltages in order to synchronize the system with the utility grid harmoniously. In the standalone mode of microgrid, a cascaded controller employing proportional and resonant (PR) controller is used to generate the switching pulses for the power conversion unit to operate in voltage control mode. Simulated results are presented and illustrated the synchronization, which occurs within 3 cycles upon restoration of the grid. The performance of microgrid is simulated under various conditions and the results are presented, which comply with the IEEE 1547 std.