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Coordination of OLTC and Smart Inverters for Optimal Voltage Regulation of Unbalanced Distribution Networks

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Document pages: 11 pages

Abstract: Photovoltaic (PV) smart inverters can improve the voltage profile ofdistribution networks. A multi-objective optimization framework forcoordination of reactive power injection of smart inverters and tap operationsof on-load tap changers (OLTCs) for multi-phase unbalanced distribution systemsis proposed. The optimization objective is to minimize voltage deviations andthe number of tap operations simultaneously. A novel linearization method isproposed to linearize power flow equations and to convexify the problem, whichguarantees convergence of the optimization and less computation costs. Theoptimization is modeled and solved using mixed-integer linear programming(MILP). The proposed method is validated against conventional rule-basedautonomous voltage regulation (AVR) on the highly-unbalanced modified IEEE 37bus test system and a large California utility feeder. Simulation results showthat the proposed method accurately estimates feeder voltage, significantlyreduces voltage deviations, mitigates over-voltage problems, and reducesvoltage unbalance while eliminating unnecessary tap operations. The robustnessof the method is validated against various levels of forecast error. Thecomputational efficiency and scalability of the proposed approach are alsodemonstrated through the simulations on the large utility feeder.

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