“20th PSCC 2018 papers submission and review platform

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Optimal Tap Selection of Step-Voltage Regulators in Multi-Phase Distribution Networks

An optimal power flow (OPF) problem is formulated that allows for tap selection of various types of step-voltage regulators (SVRs) in multi-phase distribution networks. The objective is to minimize the amount of imported power to the distribution network while satisfying operational constraints. Variables include nodal power injections, nodal voltages, and SVR turn ratios. SVRs are modeled according to their voltage gains and their connecting transmission line parameters. A set of power flow equations that rely on the nodal admittance model of SVRs and explicitly account for the turns ratios are derived. Chordal SDP relaxations of the power flow equations are pursued for non-SVR edges. For each SVR type, novel relaxations are proposed to accommodate the turns ratios. Results on the IEEE 37-bus feeder indicate that the proposed formulation succeeds in selecting taps of wye, closed-delta, and open-delta SVRs while maintaining the incurred cost within 1% of its optimal value.

Author(s):

Mohammadhafez Bazrafshan    
The University of Texas at San Antonio
United States

Nikolaos Gatsis    
The University of Texas at San Antonio
United States

Hao Zhu    
The University of Texas at Austin
United States

 

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