A New Global Index for Short Term Voltage Stability Assessment

The utility scale of non-conventional generators (NCGs), such as wind and photovoltaic (PV) plants, are competitive alternatives to synchronous machines (SMs) for power generation. Higher penetration NCGs has been respondent causing several recent incidents leading up voltage collapse in systems due the distinct characteristics under different operating conditions. Consequently, so-called system strength reduced with higher penetration. A number indices have developed quantify from short-term stability (STVS) perspective. None capture overall performances on dynamic recovery. In this paper, an improvement one STVS namely, Voltage Recovery Index (VRI), is proposed overcome shortcomings original index. Moreover, improved index globalized establish a new defined recovery (VRIsys) at level. amended VRI VRIsys used systematic simulations impact interaction various factors that could affect strength. assessment was conducted using time-domain simulation direct connected induction motors (DCIMs) proliferation converter-based technologies both generation load sides, Variable Speed Drives (VSDs), respectively.