Abstract:
BESSs connect renewable generations (RGs) to the utility grid. In this cascaded configuration of the grid-connected inverter, battery, and RG, the battery power is passively governed by the RG-grid power difference. This compromises battery state-of-charge (SoC) control and increases storage capacity.
This paper proposes a hybrid electric spring (HES) integrated with the RG and noncritical load (NCL) for grid-tied power control and battery storage reduction in ac microgrids. An integrated configuration allows flexible power flow between battery, NCL, and grid.
The HES also has a wider grid-tied power control operating region than the BESS and electric springs. HES operation, steady-state analysis, and control design are discussed. Simulations and experiments validate grid-tied power control and battery SoC control.
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