Stability Constrained Voltage Control for Transmission Grids

With increasing penetration of renewable energy sources (RESs), the significant volatility and time-varying characteristics of RESs introduce new challenges to the conventional methods of continuously assessing voltage stability in transmission grids. In response to these challenges, we introduce a novel voltage stability metric referred to as the K-index, along with a synchronized voltage control strategy which enhances the stability of the system’s voltage, as quantified by the K-index. In the proposed scheme, we integrate RESs with established voltage control instruments, notably synchronous generators (SGs). Our objective encompasses the dual task of managing monitored voltages within permissible thresholds while elevating the broader spectrum of voltage stability. Notably, the controller demands only essential grid model data, encompassing voltage, reactive power, and K-index metrics within the system, and employs real-time measurements to craft refreshed set-points for SGs. The preeminence of our proposed algorithm is substantiated through its simulation within a succinct 4-bus system.