Voltage-profile-based approach for developing collection system aggregated models for wind generation resources for grid voltage ride-through studies

Abstract

This paper presents a novel voltage-profile-based approach to develop collection system aggregated models for various WGR facilities to accurately represent their detailed counterparts from a steady state and dynamic voltage response standpoint. A customised automated module developed by the authors is utilised to develop detailed collector system models for WGR facilities accurately representing various aspects of the facility. Short-circuit analysis at the point of common coupling is utilised to obtain the fault-voltage profile at each turbine terminal within the WGR facility. The resulting voltage profile is utilised in conjunction with the under-voltage relay settings associated with the turbine type or types being employed at the facility to identify the number and nature of the groups comprising the aggregated model. Additional short-circuit analysis is performed at breakpoint buses to selectively identify the subnetwork equivalent impedance to represent the aggregated WGR models. The resulting collector system aggregated models are validated from a steady state and dynamic voltage response standpoint by comparison with their detailed counterparts. The paper also demonstrates the robustness of the proposed approach by means of application on different types of WGR facilities currently operational in the ERCOT system. Finally, the effectiveness of the approach is demonstrated performing dynamic simulations utilising the detailed and the aggregated collector system models on the ERCOT dynamic data set and performing comparative analysis on the response with and without the voltage relay models incorporated.