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In this paper, a new Volt/Var Control (VVC) scheme is proposed to facilitatethe coordination between the conventional VVC devices and the new smart PVinverters to provide an effective voltage control on a system with high PVpenetration. The proposed scheme decomposes the problem into two levels. Thefirst level uses Load Tap Changer (LTC) and Voltage Regulators (VRs) to adjustthe voltage level on the circuit to keep the voltages along the circuit withinthe desired range. The second level determines Var support needed from smartinverters to smooth the fast voltage variations while providing effective powerfactor correction to keep the power losses at minimum. The case study showsthat the proposed VVC method is very effective in maintaining acceptablevoltages on the system under various operating conditions while meeting theoperational constrains. The results also show the computational efficiency ofthe method.

A Coordinated Volt-Var Control Scheme for Distribution Systems with High DER Penetration