Parallel Distributed Energy Generation Based Microgrid Incorporating Reactive Power Sharing and Grid Synchronisation Capability

This paper presents multiple parallel distributed energy sources (DERs) based generating unit connected to a common
$AC$
bus for supplying uninterrupted power to
$AC$
local loads while exercising on power quality of microgrid (MG). Main focus of this work is a) to share net reactive power demand of loads between parallel voltage source converters (which minimize burden of single converter) and 2) has capability to synchronize to the grid, when the grid is available (seamless grid synchronization ability). Sliding Goertzel pre-filter-based frequency locked loop is used to calculate fundamental component of local loads and also to obtain frequency during grid synchronization also when the grid is subjected to voltages unbalance. A brushless direct current (BLDC) machine is used as a wind generating unit because it is independent of voltage and frequency fluctuations at
$\text{AC}$
bus unlike other conventional
$\text{AC}$
generators. Wind energy conversion and solar energy conversion system along with a battery storage are connected to form a MG, which is modelled and its performance is simulated in MATLAB and adaptability of MG is found through obtained results.