Overvoltage Protection Controller Design of Distributed Generation Connected to Power Grid Considering Islanding Condition

  • Received : 2017.08.10
  • Accepted : 2017.10.20
  • Published : 2018.03.01


Distributed generation (DG) is being highlighted as an alternative for future power supplies, and the number of DG systems connected to conventional power systems is steadily increasing. DG generators are designed using power electronics and can give rise to various power quality problems, such as overvoltage or overcurrent. Particularly, unintentional islanding operation can occur in a conventional power system when the power grid is separated from the DG systems. Overvoltage may occur in this situation, depending on the power generation and power consumption. However, overvoltage phenomena might not happen even when islanding occurs. Therefore, it is necessary to analyze the fault characteristics during islanding. In this study, a fault analysis of islanding operation was carried out using PSCAD/EMTDC, and a countermeasure for the overvoltage problem is proposed.


Supported by : Korea Institute of Energy Technology Evaluation and Planning (KETEP)


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