Abstract:
The advancement of power electronic-based sensitive loads drives the power utilities’
devotion to power quality issues. The voltage disturbance could be happening due to fault conditions,
switching of loads, energizing of transformers, or integration of highly intermittent energy sources
such as PV systems. This research work attempts to enhance the voltage fluctuation of a sensitive
load connected to a grid-integrated PV system using a battery-based dynamic voltage restorer
(DVR). The proposed battery energy storage-based DVR has two separate controlling stages that
are implemented at the DC–DC buck/boost converter of the battery and voltage source converter
(VSC) system. Charging and discharging of the battery is operated based on the state-of-charge
(SOC) value of the battery and the measured root mean square (RMS) voltage at the point of common
coupling (PCC). The VSC of the DVR detection and reference generation control is done appropriately.
In the detection control of the VSC, a combination of RMS and dq0 measurement techniques is
used, whereas in the reference generation control, pre-fault strategy is implemented to restore both
phase jump and magnitude distortions. Symmetrical and asymmetrical voltage sags scenarios are
considered and the compensation demonstration is carried out using power system computer-aided
design (PSCAD/EMTDC) software.
