Abstract
Robust operation of DC microgrids is seriously jeopardized by renewable energy sources fluctuations and intermittency, abrupt load changes and unscheduled disconnections from the utility grid. These disturbances can cause DC bus voltage instability and power quality issues. Therefore, utilization of properly controlled energy storage systems, plays a substantial role for a smooth and secure operation, especially in islanded operation mode. However, frequent cycling operation and high charging/discharging rates render the (energy-type) battery storage systems unsustainable solution due to their quick lifetime reduction. On the other hand, (power-type) superconducting magnetic energy storage (SMES) systems have almost zero lifetime degradation under the aforementioned conditions. This study proposes a PI-droop controlled SMES-battery hybrid energy storage system to enrich the stability of an islanded DC microgrid and extend battery service time, simultaneously. Simulations conducted in PSIM software, demonstrate the effectiveness of the adopted control scheme, in terms of microgrid power quality and battery lifetime extension.
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