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.

近几十年来，分布式发电（DG）的飞速发展，以及从技术，财务和环境的角度来看至关重要的作用，使得对DG及其利用的分析需要认真分析变得更加突出。由于大多数DG设备的输出功率是DC或与网络频率不符，因此需要通过功率电子接口将其连接到网络。因此，电力电子接口的行为及其低惯性会影响配电系统的小信号稳定性以及DG装置的最佳尺寸和位置。在本文中，利用基于逆变器的DG装置（IBDG），网络分支和负载的动态模型来研究小信号稳定性约束对IBDG在径向配电系统（RDS）中的最佳尺寸和位置的影响。与以前的许多研究相似，已经实现了一种遗传算法来找到IBDG的最佳尺寸和位置，以使总有功功率损耗最小。IEEE 33总线测试系统上的仿真结果表明，DG放置研究没有考虑小信号稳定性，可能会导致结果不准确，从而对小信号稳定性产生有害影响。