Hybrid 전력망의 모델링 및 사고 해석

Abstract

In order to increase an acceptance of renewable energy sources and to lay out an efficient power grid, a hybrid power grid model design and faults analysis must be preceded. This paper is a basic study for a hybrid power grid configuration, fault analysis, and protection coordination. Using PSCAD software, modeling of a hybrid power grid and faults analysis through short circuit are performed. First, a hybrid power grid consisting of an AC 154[kV] power source, a 50[MVA] transformer, a MVDC and LVDC power grid through bidirectional power converters, PV, and load was constructed. Each components of the selected hybrid power grid was modeled with PSCAD software and the controllers were designed and simulated. And it is intended to analyze the faults characteristics by grasping the fault currents during the short circuit and +pole to -pole faults while changing each fault inception location. Finally, the simulation results of the faults analysis by the maximum value and the current fluctuation rate of the fault currents were compared.