Optimal Allocation of Distributed Generation With Optimal Sizing of Fault Current Limiter to Reduce the Impact on Distribution Networks Using NSGA-II

Nowadays, the presence of distributed generation (DG) units in the distribution network is increasing due to their advantages. As well as these advantages, there are some problems, such as increasing the level of short circuits in buses and disturbing the protection operation of the network. The main objective of this paper is optimal using of fault current limiters (FCLs) in series with DG units to reduce the negative impacts of the DG units. The method of simultaneously determining the optimal location and size of DGs and the optimal size of FCLs is proposed in this paper. By appropriate allocation of DG units in the distribution network, a considerable reduction in the size of fault current limiters can be achieved. The locations of DG units are considered to be discrete variables and the sizes of FCLs and DGs to be continuous variables, and a nondominated sorting genetic algorithm (NSGA-II) is used to reduce losses and optimize the sizes of fault current limiters. The proposed method is implemented on two test networks and the results demonstrate the efficiency of the method.