Determination strategies of low-voltage ride-through/ zero-voltage ride-through curves in Taiwan grid codes

This study proposes a method for establishing the fault ride-through (FRT) criteria, primarily aimed at the low voltage ride-through (LVRT) and zero-voltage ride-through (ZVRT), in response to the voltage dips. The increased penetration of wind power generation may gradually affect the stability of the power systems. Therefore, the FRT capability of wind turbines is critical; however, a clear and systematic strategy for the FRT curve specifications must be formulated. In this study, the characteristics of the power system of the Taiwan power company (TPC) and existing TPC specifications were considered to determine the suitable FRT criteria. The power system simulator for engineering (PSS/E) software package was used to analyse the TPC power system case data for 2025. A methodology was developed to establish the FRT criteria using a series of PSSE-based simulations, including a short-circuit fault analysis and static and dynamic scenario-based system simulations. The main process was implemented by selecting the observation points based on the voltage dips, developing a transient simulation plan following the TPC regulations, and formulating the FRT curves based on the simulation results.