Simulation-based analysis of the anti-islanding requirement specified within the Grid Connection Code for Renewable Power Plant (GCCRPP)

Coupling Renewable Power Plants (RPPs) into the grid introduces a new concept to the operation of the network: that of islanding. Islanding is when the link to the utility network becomes disconnected, but the RPP continues to supply the load (islanded load matches RPP generation). The presence of Distribution Generation (DG) in networks usually results in islanding not being allowed, this is because the utility does not have control and/or visibility over its plant in the islanded portion of the network as well as the power quality the customer will experience. Islanding also poses a risk to utility workers and equipment. The South African Grid Connection Code for Renewable Power Plant (GCCRPP) connected to the transmission and distribution system [1] stipulates that islanding must be detected and terminated within a maximum time of two seconds. This research investigates what the parameters are that determine what the maximum time should be. Preliminary studies have been conducted for synchronous DG which suggests that amendments could be possible for the GCCRPP to detect and terminate the islanding condition within a time less than the presently specified two seconds. Further research should be conducted to include inverter based-DG and different types of islanding detection methods for amendment to be concluded.