Optimal Mapping of DG Units in Island Partitioning Mode under Fault Condition Using BPSO: A Case Study of Thadi Feeder of Nepal

The distribution system is one of the most crucial parts of a power system. In case of any emergency fault condition in the network, the islanding operation with available Distributed Generation (DG) will maintain the availability/ reliability of the system within acceptable limit. The available DGs must be allocated optimally such that maximum load will be restored in the system. The purpose of this study is to determine the best approach for restoring the post-fault distribution system. It utilizes the graphical algorithm to assign the load to the DGs and perform the load shedding problem using Binary Particle Swarm Optimization (BPSO), if there is any shortage of the power supply in the system. Also, the load flow analysis is also performed to check the feasibility of the obtained optimal mapping of DGs. This paper properly takes into account the load priorities factors, voltage limit, power imbalance issues and the line capacity requirements for the optimal operation of system. The methodology is applied to rural radial distribution network of Nepal Electricity Authority (NEA), Thadi feeder, Nepal. and the results reflects the optimal maximum restoration of the load during post fault conditions.