Comparison of fixed speed and doubly-fed induction wind turbines during power system disturbances

Análisis Comparativo De Los Modelos Dinámicos De Una Turbina Eólica De Velocidad Fija

“…En otros trabajos, la respuesta de estabilidad dinámica es evaluada en términos de la recuperación de la tensión, sin embargo, el modelo matemático del acoplamiento mecánico es representado con ayuda del modelo de una masa, ignorando la flexibilidad aportada por la multiplicadora al acoplamiento mecánico entre las palas del rotor eólico y el eje del generador eléctrico [4], [11], [12]. Estas excesivas simplificaciones pueden conducir a resultados y conclusiones erróneas.…”

Operation of Grid-Connected DFIG Under Unbalanced Grid Voltage Condition

“…Assuming the DFIG itself is symmetric, the voltage equations of positive and negative dq sequences in generator convention are listed as in (9).…”

“…As DFIG's stator is directly connected with ac grid, it has poor low-voltage ride through (LVRT) capability due to the poorly damped flux oscillations during grid voltage dip. Many studies have been conducted on the LVRT capability of DFIG [3]- [6], [9], with most of them focused on the behavior and protection of DFIG under symmetrical fault. During the symmetrical fault, transient overcurrent in the rotor is identified as the most severe LVRT problem of the DFIG, because the rotor-side voltage source converter (VSC) is very sensitive to thermal overload.…”

Analysis and Modeling of Advanced Power Control and Protection Requirements for Integrating Renewable Energy Sources in Smart Grid,

“…These were the first Danish wind turbines, which completely dominated the market up to the mid-1990s (the reason why this technology is named the Danish concept [79]. The basic configuration of the WT based on FSIG is shown in Figure. 2.1, including a turbine rotor, gearbox, squirrel-cage induction generator, soft-starter, mechanical-switched capacitors (MSCs), and a transformer for grid connection.…”