PV-BES Microgrid System

What is it about?

This work deals with a grid-connected PV (photovoltaic)–BES (battery energy storage)-based microgrid ensuring reliable and continuous power to dedicated loads with mode transfer capability and power quality improvement at distorted grid voltage condition. This system operates in three modes: pre-specified grid power mode when both BES and generation from a PV array are available, variable power mode in the absence of either BES or a PV array generation, distribution static compensator (DSTATCOM) mode at the absence of both the BES and power from PV array. In pre-specified grid power mode, the BES stores energy during surplus energy generation from the PV array and injects this energy into the grid during deficient PV array power besides feeding the load, thus enhances the stability of the grid. The harmonics-free load current component estimated utilizing a linear quadratic regulator-tuned complex coefficient–complex variable frequency control algorithm, and the grid voltage in-phase unit templates are utilized to synchronize and control the voltage source converter of the microgrid in a variable power mode and DSTATCOM mode of operations to address the power quality issues besides injecting power to the utility grid and feeding the loads. The voltage control regulates the PCC voltage magnitude and nature in an islanded mode. The mode transition ensures a seamless transfer of mode from synchronized mode to standalone mode and vice versa.

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Why is it important?

This system ensures reliable and cheap power to critical load and supports utility grid during peak load hours. The loading on the utility grid is leveled. The VSC utilization is enhanced to reduce the payback period of the VSC.