Abstract
Microgrid technology is evolving rapidly with increased use Renewable energy (RE) in electricity sector. In this paper, an isolated DC microgrid is simulated with solar photovoltaic (PV) as the RE source to supply power to resistive DC charges along with a hybrid energy storage system (HESS) for battery and supercapacitor. Various cases of load and solar insolation variability are simulated to validate the proposed power management strategy for controlling the DC bus voltage. The output waveforms are compared with and without HESS, and beneficial reduction in transient voltage is observed when using the HESS. A case using IEEE 9bus is also simulated to evaluate device output with a constant demand for load. It is found that in all cases HESS helps to minimize transients of the DC bus voltage effectively. The HESS also compensates for very large transients resulting in sudden changes in the output of PV or load demand.
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