Determinación de la Respuesta Dinámica y Estacionaria de la Frecuencia frente a Desbalances de Potencia Producidos por Perturbaciones en la Red

Abstract

This paper proposes a new methodology for determining the transient and steady state frequency deviations produced by disturbances in the power system that modify the generationload balance. Based on the equivalent frequency response model, analytical expressions are derived to calculate the maximum transient frequency deviation, the instant it occurs, and the amount of load to be shed due to Under Frequency Load Shedding Scheme (UFLS) action. To this end, a fi rst order model is employed to represent the governor-turbine block of each generator. In this paper, the model has been extended to represent hydro turbine speed governors of different technology. Additionally, the methodology determines the post-disturbance steady state frequency, after primary frequency control (PFC), taking into consideration the load disconnected by UFLS and spinning reserve limits of generators under PFC. Lastly, the proposed methodology is applied to two test systems, showing an excellent ability to accurately estimate the transient and steady state frequency response, due to active power imbalances.