An adaptive vector control method for inverter-based stand-alone microgrids considering voltage reduction and load shedding schemes

The droop mechanism is widely utilized in a stand-alone microgrid (MG) to regulate power-sharing among distributed generators (DG). However, over the years, the droop phenomena are continually modified to lessen the deviation in voltage and frequency parameters caused due to classical droop. This study suggests computing the droop coefficient for voltage-current (V-I) droop to take into account for proportional power distribution among DGs. In grid utility networks, the conservation voltage reduction (CVR) strategy is widely used to curtail the use of energy. Hence, this paper investigates the CVR's performance for stand-alone MG by performing the adaptive vector control scheme in the two-phase d-q reference frame. In addition to it, the paper is intended to develop a coordinated control strategy for stand-alone MG involving classical P-f droop and self-sustained V-I droop employed to perform the function of CVR during peak demand and overloading conditions. Further, a load-shedding control approach is also considered to cut out some segments of load during overloading conditions to operate the MG in the stable zone. The validation of the proposed strategy is conducted on MATLAB/Simulink software.