Abstract
This paper investigates the distributed voltage control problem of a distribution power grid in which a voltage rise occurs due to reverse load flow from distributed generators. A centralized operation to maintain the grid voltage becomes difficult, since the number of distributed generators being involved is large. This paper considers a real-time pricing strategy and distributed optimization by each distributed generator. An independent public commission or community manager called utility, who intends to maintain the grid voltage, tries to determine and provide an additional price, which conceptually represents tax or subsidy, to each distributed generator. The distributed generator decides its desired output by solving an individual optimization problem including the provided price. This feedback interaction between the utility and distributed generators eventually maintains the grid voltage. Effectiveness of the proposed real-time pricing and distributed decision making methodology is evaluated through numerical experiment.
