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Abstract: High penetration levels of distributed photovoltaicPV generation on anelectrical distribution circuit present several challenges and opportunitiesfor distribution utilities. Rapidly varying irradiance conditions may causevoltage sags and swells that cannot be compensated by slowly responding utilityequipment resulting in a degradation of power quality. Although not permittedunder current standards for interconnection of distributed generation,fast-reacting, VAR-capable PV inverters may provide the necessary reactivepower injection or consumption to maintain voltage regulation under difficulttransient conditions. As side benefit, the control of reactive power injectionat each PV inverter provides an opportunity and a new tool for distributionutilities to optimize the performance of distribution circuits, e.g. byminimizing thermal losses. We discuss and compare via simulation various designoptions for control systems to manage the reactive power generated by theseinverters. An important design decision that weighs on the speed and quality ofcommunication required is whether the control should be centralized ordistributed i.e. local. In general, we find that local control schemes arecapable for maintaining voltage within acceptable bounds. We consider thebenefits of choosing different local variables on which to control and how thecontrol system can be continuously tuned between robust voltage control,suitable for daytime operation when circuit conditions can change rapidly, andloss minimization better suited for nighttime operation.

Autor: Petr Sulc, Konstantin Turitsyn, Scott Backhaus, Michael Chertkov

Fuente: https://arxiv.org/


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