Voltage-Sensitivity-Approach-Based Adaptive Droop Control Strategy of Hybrid STATCOM

Abstract

In this study, we propose an adaptive droop control strategy for application to hybrid static synchronous compensator (STATCOM) systems. The proposed voltage-sensitivity-based adaptive droop control scheme using a hybrid STATCOM system helps eliminate any possible interference from other voltage regulation devices while achieving better voltage regulation without implementation of a full observation of the corresponding network. Sensitivity analysis was performed by voltage control of the STATCOM system, and sliding-mode control was included for robustness of the control system. The fixed and adaptive control methods were compared through case studies of the IEEE 39-bus test system. The results were further verified through a transient simulation of the hybrid STATCOM system by considering both low- and high-penetration levels of inverter-based resources.