Microgrid Voltage Stability Indices Improvement Using Particle Swarm Optimization

This paper provides a strategy for improving microgrid voltage stability indices (VSI) using particle swarm optimization (PSO). The L-index value is used to assess the weak bus of the system. The IEEE 33-bus system is used for evaluating the proposed method, including four cases as follows; the IEEE 33-bus base case, the IEEE 33-bus with L-index improvement, the IEEE 33-bus as microgrid (MG), and the modified IEEE 33-bus as microgrid with L-index improvement. For VSI improvement, PSO is utilized to determine the generator bus voltages for minimizing the L-index. The proposed method can successfully minimize the L-index for both conventional distribution networks and MG systems, from the simulation results.