Co-Optimization Strategy of Static and Dynamic Reactive Power Compensation Devices for Reducing Reactive Power Fluctuation at Switching Moment

As the proportion of new energy in the power grid increases, maintaining voltage stability becomes an increasingly challenging task. To ensure the reliable operation of the grid, additional reactive power compensation devices are needed. Among these, the Static Var Generator (SVG) plays a critical role. While extensive research has focused on the co-control of SVGs with other dynamic reactive power compensation devices, fewer studies have explored the coordination between SVGs and static reactive power devices. The paper aims to enhance grid stability by replacing part of the reactive power output of the SVG with static reactive power devices during steady-state conditions. This, in turn, allows the SVG to provide more reactive power support during transient grid events. To achieve this, the study utilizes the PSCAD/EMTDC simulation platform to model a wind farm equipped with SVG. Capacitors are used to replace the reactive power output of SVGs in steady state, and the precise switching moments of static reactive devices are calculated to minimize reactive power fluctuations during the replacement process. The results offer a novel solution to voltage stability in grids with a high share of new energy integration and provide significant engineering applications for the coordinated use of SVGs and static reactive power compensation devices.