Enhancement performance of grid-connected PV system based modified active-reactive power control approach.

PV systems typically use inverters with a unity power factor, producing only active power. Many recent studies have looked at the potential benefits of reactive power, including voltage regulation, congestion mitigation, and loss reduction. Typical medium voltage distribution systems are the subject of this article, exploring ways to cut down on losses. The system losses are compared to the losses of the PV inverters. Solar PV inverters can generate various active power for each scenario and allowable levels of reactive power provisioning, depending on the type of load and PV penetration level. Only a handful of PV inverter operating conditions have a positive energy balance to reduce loss. Loss reduction is not possible at low and medium load levels. Under overload and also large-scale PV penetrations, the power factor decreases. The receive power regulator saves the power factor in the nominal range to solve this problem. According to the results of simulations, PV systems with control schemes may be able to take in or provide grid-reactive power to or from while maintaining a power factor ranging from 0.95 to 0.9998. The Total Harmonic Distortion (THD) value for output inverter voltage can be as low as 2.23 % and 4.43% for current, demonstrating that the control method is resilient to rapid fluctuations in the input voltage. [ABSTRACT FROM AUTHOR]