Modeling, Control, and Stability of Smart Loads Toward Grid of Nanogrids for Smart Cities

Low inertia power generation units make islanded microgrids and nanogrids more vulnerable to voltage and power fluctuations. Smart loads are a possible solution to suppress voltage and power fluctuations in islanded nanogrids. Since smart loads utilize inverters with short-time responses, their dynamics would have a considerable effect on the dynamics and stability of nanogrids, Therefore, the dynamics of smart loads play a significant role for stability analysis of these systems. This paper analyzes the dynamic behaviors of smart loads in nanogrids. Furthermore, a state-space model is developed for smart loads. The stability of smart loads is studied using the developed model, along with circuit simulations. The case study simulations are provided to verify the performance of utilizing smart loads in mitigating voltage and power fluctuations in islanded nanogrids.