Voltage Stability Analysis of Multi-microgrid Clusters

This paper analyses the impact of microgrid clusters on the voltage stability of the IEEE 14-bus multi-machine power system. To simulate the realistic operation of microgrids, a hybrid renewable-energy system consisting primarily of wind and PV power generation is incorporated into the original microgrid architecture. The response of the grid's voltage stability is observed under N-0, N-1, and N-2 contingency. Static voltage stability analysis is performed by observing the system's load margin using PV curves under different fault scenarios, determining whether the system is at risk of voltage collapse. The power flow distribution and line efficiencies are also examined. Furthermore, a voltage stability index is introduced to quantify the stability of each bus, providing a more intuitive understanding of the voltage-stability differences under different fault conditions. Regarding dynamic voltage-stability analysis, this paper conducts real-time simulations of the response of load buses under various fault scenarios. By comparing static and dynamic analyses, the voltage stability of the studied system can be observed from different perspectives.