Coordinated Control for Performance Enhancement of an Islanded AC-DC Microgrid with Uninterrupted Power and Seamless Transition Capabilities

In this project, a simplistic control approach and multimode operation of a wind-solar based AC/DC microgrid is implemented. The islanded microgrid consists of a doubly-fed induction generator (DFIG) for wind energy conversion, and a solar photovoltaic (SPV) array for solar energy conversion. In this configuration, the stator terminals of DFIG are connected at the point of common intersection (PCI) of AC loads via a stator-side solid-state transition switch (SSSTS). The developed control strategy is designed to seamlessly disconnect and reconnect the DFIG stator from the PCI based on the SSSTS operation, without interrupting power to AC and DC loads in the microgrid. Moreover, the power quality enhancement at the DFIG stator is achieved without injecting any undue harmonics in the DFIG rotor currents. The simulation results can be evaluated by using Matlab/Simulink Software.

Keywords: Islanded AC/DC microgrid, seamless transition, uninterrupted power, doubly-fed induction generator (DFIG), solar photovoltaic (SPV) array, power quality.