Abstract
Increasing the proportion of renewable energy generations in remote island power systems is becoming essential for realizing decarbonized society. However, since inverter-connected renewable energies have different generation characteristics from conventional generators, the massive penetration can adversely affect system stability. In particular, fault events in such weak remote systems can cause fast voltage collapse, and there is a need to assess dynamic voltage stability. This study attempts dynamic voltage stability assessment using the critical boundary index (CBI) and investigates the impact of the virtual synchronous generator (VSG) on dynamic voltage stability. A remote island power system and VSG are modeled, and time-domain simulations are conducted with case studies of fault events. The simulation results show the potential of CBI to use for dynamic voltage stability assessment. Furthermore, the VSG can provide suitable power output during fault events and improve dynamic voltage stability.
Highlights
The case studies show that the critical boundary index (CBI) accurately detects the voltage collapse point even during fault events
It confirms that the virtual synchronous generator (VSG) suppresses the fast voltage collapse caused by fault events
We can conclude that the CBI can accurately assess the dynamic variation of voltage stability and that the VSG can contribute to maintaining the voltage stability against fault events
Summary
The rapid spread of the sustainable development goals (SDGs) over the past few years has increased the pressure to reduce carbon emissions, and the introduction of renewable energies for energy decarbonization is becoming increasingly important. Transient stability probability assessment in high penetration renewable energy grids has been studied to achieve dynamic reactive power configuration [4]. Few studies have investigated the impact of VSG on voltage stability. CBI represents the proximity to voltage collapse by par unit (pu), and the values of ∆P and ∆Q can evaluate the margin of active and reactive power to the unstable region. This study attempts to apply CBI to assess dynamic voltage stability and investigates the impact of VSG on voltage stability. The CBI is first proposed in [15]
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