Large-scale integration of converter-based renewable energy sources into power systems, such as wind generation, can lead to frequency stability issues due to the variable nature and lack of inertia of these technologies in combination with the gradual replacement of conventional generating units. However, wind turbine generators (WTGs) can be exploited to provide frequency support and keep system frequency stability requirements. A case study considering the Mexican Electric Power System is presented in this study to highlight both the impact of large-scale deployment of inverter-interfaced wind energy generation on system frequency response, and the participation of WTGs in inertial and primary frequency control (IPFC) as a mitigation approach. By incorporating synthetic inertia and droop control functions into the active power control loop of WTG converters, IPFC by wind generation is assessed for several wind shares, different active power modulation strategies based on the rate of change of frequency and frequency deviation, and several IPFC contribution levels under critical contingencies for generation outage. Simulation results show the combination of increasing share of wind energy generation in the study system and retirement of conventional generation has a clearly negative impact on system frequency dynamics. However, the incorporation of IPFC functions into wind power generators of the sample system, with appropriate control gain values, may contribute to effectively achieve an improved system performance in terms of grid frequency response under high wind power penetration scenarios.
• límites de transmisión • límite térmico • cargabilidad de líneas • límite oscilaciones ante disturbios pequeños Resumen En este artículo se presenta la aplicación de varias metodologías para calcular el límite de transferencia de potencia que garantice una operación segura en las redes de energía eléctrica. Se describen aspectos de interés para la determinación de flujos máximos de energía eléctrica a través de líneas de transmisión en redes eléctricas. Se determina el límite térmico de conductores eléctricos, la cargabilidad de líneas de transmisión y el límite de estabilidad ante oscilaciones interárea de enlaces de transmisión entre regiones. Para el caso de oscilaciones interárea, se presentan los resultados de la aplicación de un esquema de corte de carga para estabilizar un modo de oscilación interárea al amortiguar oscilaciones negativas y llevar con ello al sistema eléctrico a una condición de operación estable. Para ilustrar la metodología se utiliza un modelo del sistema interconectado mexicano.
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