Optimal placement and sizing of distributed generation with small signal stability constraint

In recent decades, galloping growth of distributed generation (DG), and its vital role from technical, financial, and environmental point of view, has made it more prominent that DG and its utilization need to be analyzed meticulously. Since most DG units' output power is DC or is not in accordance with network frequency, they need to be connected to the network via power electronic interface. Therefore, the behavior of power electronic interface and their low inertia can affect distribution system's small signal stability and optimal size and location of DG unit consequently. In this paper, dynamic models for Inverter-Based DG unit (IBDG), network branches, and loads are utilized in order to scrutinize impacts of small signal stability constraint on optimal size and location of IBDG in radial distribution system (RDS). Similar to many previous studies, a genetic algorithm has been implemented to find optimal size and location of IBDG with the aim of total active power loss minimization. Simulation results on the IEEE 33-bus test system show that, DG placement studies without small signal stability consideration, can lead to inaccurate outcomes which have deleterious impacts on small signal stability. (c) 2020 Elsevier Ltd. All rights reserved.