An Improved Fault Ride-Through Strategy for Renewable Power Plants Considering Collector Line Characteristics

With the continuous growth in the installed capacity of renewable power plants, the transient dynamics of power systems, which incorporate a high proportion of renewable energy and power electronic devices, are becoming increasingly complex. This complexity raises the risk of voltage instability during faults at renewable power plants, posing a serious threat to the safe and stable operation of power systems. To address these challenges, this paper establishes an equivalent model of renewable power plants to study the impact of collector line parameters on fault ride-through (FRT) performance. Subsequently, a FRT strategy for renewable power plants considering collector lines is proposed. Furthermore, to address the issue of uncertain line parameters in renewable power plants, Koopman theory is applied to achieve high-dimensional linearization of low-dimensional functions. The collector line parameters for the renewable power plants are obtained by utilizing actual operational data as samples. Finally, electromagnetic transient simulations are conducted in PSCAD to verify the improved voltage support performance of the proposed FRT strategy.