Efficient Distribution Grid Optimal Power Flow with Discrete Control of Legacy Grid Devices

Savasci A., Inaolaji A., Paudyal S., Kamalasadan S.

2021 IEEE Power and Energy Society General Meeting, PESGM 2021, Washington, United States Of America, 26 - 29 July 2021, vol.2021-July identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 2021-July
  • Doi Number: 10.1109/pesgm46819.2021.9638228
  • City: Washington
  • Country: United States Of America
  • Keywords: Capacitor banks, Distribution grid modeling, Legacy devices, Load tap changers, Optimal power flow
  • Abdullah Gül University Affiliated: No


In this work, we present a mathematical model and a computational study of a distribution grid optimal power flow (DOPF) problem with legacy grid devices, i.e., load tap changers (LTCs) and switched capacitors, in active distribution systems. The DOPF model in its original form, with control of LTCs and switched capacitors, is a mixed-integer nonlinear programming (MINLP) problem, which is computationally intractable. Therefore, efficient mixed-integer DOPF models are required for practical feeders to optimally dispatch LTCs and switched capacitors. To this end, utilizing a well known Second Order Cone Programming (SOCP) version of the DOPF formulation, we adopted an exact mixed-integer linear model of LTCs and switched capacitors that leads to an efficient Mixed-Integer SOCP (MISOCP) formulation. The computational performance of the MISOCP DOPF model is evaluated on a modified IEEE 123-node feeder with single-period and multiperiod runs. We showed that MISOCP based OPF formulation provides promising performance in managing legacy grid devices for practical-sized feeder with inter-temporal consideration.