Impact of Circuit Topology based Virtual Synchronous Generator on IGBT Lifetime and Frequency Stability

Abstract

Increasing integration of inverter power sources into the electrical power system has raised concerns about a lack of system inertia, leading to potential disturbances in system frequency and speed during grid disruptions. Virtual synchronous generator (VSG) control is a promising solution for inertia support of the electrical power system. VSG's inertia enhances system stability by eliminating small and occasional disturbances. Also, the power variation in power electronic interface inverters caused by VSG control increases the stress on power semiconductor devices. This study focuses on the ability of VSG employing three-level topology to ensure system stability and the impact on the lifetime power semiconductors. The result shows that while VSG contributes more to system stability with lager inertia, it also reduces the lifetime of power semiconductors. However, the application of three-level topology was found to mitigate the reduction in the lifetime of power semiconductors.