Loop Current Calculation based on Voltage Angle Difference at Tie Switch for Switching Plan Validation in Distribution System Operation

상시개방점 양단전압 측정값을 이용한 배전선로 루프운전 가능 여부 판단 방법

Son, Juhwan;Lim, Seongil

  • Received : 2015.03.16
  • Accepted : 2015.06.11
  • Published : 2015.07.30


Distribution systems are operated in radial structure, but temporal loop structure could be founded the live load transfer. Main purposes of reconfiguration of distribution network are load balancing, loss minimization and voltage drop maintaining. In the loop structure, huge loop current can be flowed between two substations in case of large voltage angle difference. Protection devices of distribution line can be triped by this huge loop current. So, precise calculation of loop current is very important for secure switching. This paper proposes a novel calculation method of loop current using the voltage angle differences measured at the tie switches. Feasibility of the propose method has been verified by various case studies based on Matlab simulation.


Loop current calculation;Distribution system reconfiguration;Power flow calculation


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