• Dr.Archana Shirbhate
• Tushar Gajbhiye
• Sajwal Mothankar
• Shivam Kamde
• Samiksha Dhole

Distributed Generation (DG) - defined as small-scale electricity generation at or near the end user - is becoming more prevalent in recent years with an increasing penetration of renewable generation emerging in utility distribution grids. Flexible operation of these DG units is a major objective for such grids. In the operational control framework, DG units should be considered as a part of the system, so that system reliability can be enhanced by ancillary service provided by DG systems. As conventional electrical networks were not built to accommodate large DG penetration levels, several new challenges have emerged. An important issue that appears in low voltage (LV) feeders is over-voltage and under-voltage, which can limit the level of DG penetration that can be tolerated and this also, affects the LV protection systems. On the other hand, control of DG units enables a wide range of new support functions such as real/reactive power control under unbalanced voltage conditions, which can help to mitigate these unbalanced network voltages. Finally, the third research objective is to investigate inverter power control methods which can contribute to voltage quality, in particular during unbalanced voltage conditions. A detailed theoretical analysis is developed for the output power control of DG inverters under such conditions, incorporating factors which can contribute to mitigation of abnormal voltage conditions such as real and reactive power oscillatory terms, and differing grid impedance characteristics ranging from resistive to inductive. The results are used to identify the most effective control approach which achieves better voltage quality at the point of common coupling. Furthermore, fault ride through capabilities can be added to the DG inverter functionality to support the grid voltage during such symmetrical/asymmetrical faults, which consequently allow increased penetration of Distributed Energy Resources (DER). The design, modeling and simulation of the smart inverter system is performed in MATLAB/SIMULINK software environment

Distributed Energy Resources (DER), Distributed Generation (DG), Grid-connected inverter, Reactive power control, Voltage sag, Grid fault.

"Voltage Unbalance Compensation for Distributed Generation Systems under Grid Fault", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 5, page no.248-252, May-2019, Available :http://www.jetir.org/papers/JETIRBV06053.pdf

"Voltage Unbalance Compensation for Distributed Generation Systems under Grid Fault", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 5, page no. pp248-252, May-2019, Available at : http://www.jetir.org/papers/JETIRBV06053.pdf