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We consider joint control of a switchable capacitor and a D-STATCOM forvoltage regulation in a distribution circuit with intermittent load. Thecontrol problem is formulated as a two-timescale optimal power flow problemwith chance constraints, which minimizes power loss while limiting theprobability of voltage violations due to fast changes in load. The controlproblem forms the basis of an optimization problem which determines the sizesof the control devices by minimizing sum of the expected power loss cost andthe capital cost. We develop computationally efficient heuristics to solve theoptimal sizing problem and implement real-time control. Numerical experimentson a circuit with high-performance computing (HPC) load show that the proposedsizing and control schemes significantly improve the reliability of voltageregulation on the expense of only a moderate increase in cost.

Optimal Sizing of Voltage Control Devices for Distribution Circuit with Intermittent Load