Voltage Stability Analysis of Multi-microgrid Clusters

This paper aims to analyze the voltage stability of the multi-microgrid clusters (MMGCs) based on the IEEE 14-bus multi-machine power system. To simulate the realistic operation of microgrids (MGs), a hybrid renewable energy system (RES) consisting primarily of wind and solar power-generation systems is incorporated into the original MG architecture. The responses of the grid voltage stability are observed under contingency scenarios of N-0, N-1, and N-2. This paper performs a static voltage stability analysis by observing the system load margin using power-voltage curves under different contingency scenarios, determining whether the system is at risk of voltage collapse. The power-flow distributions and line efficiencies are also examined. Furthermore, the new line voltage stability Index (BVSI) and the Fast Voltage Stability Index (FVSI) are used to quantify the stability of each bus, providing a more intuitive understanding of the voltage stability differences under different contingencies.