Impact of distributed generation on protection coordination
Transcript of Impact of distributed generation on protection coordination
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Impact of distributed generation onprotection coordination
Dr. Ernesto Vázquez MartínezUniversidad Autónoma de Nuevo León, México
MICRO-EOLO
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Microgrid
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Características de la DG
} Su capacidad es menor que las unidades convencionales (térmicas e hidráulicas).
} Su nivel de carga no es asignado.} Las unidades están conectadas en medio o
bajo voltaje.} No contribuyen al control de frecuencia y
voltaje en la red.} No son consideradas cuando se hacen
estudios de expansión de la red.
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Requerimientos para la DG
} No ocasionar sobre-voltajes.} No ocasionar la pérdida de coordinación de
protecciones.} Evitar la formación de islas eléctricas.} No producir armónicas.} No causar la pérdida de sincronización.
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Tipo de conexión
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Protecciones direccionales
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Protección de generador} Para generadores 50-500 kVA:
} Protección contra falla trifásica con retardo de tiempo.
} Protección contra falla monofásica con retardo de tiempo.
} Potencia inversa.} Protecciones para detección de formación no
controlada de islas eléctricas.
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Protección de sobrecorriente instantánea
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Cobertura de la protección (50)
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Ejemplo de coordinación
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Coordinación restaurador-fusible
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Ejemplo: sin GD
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Ejemplo: con GD
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Impacto en la coordinación (20%)} Silva, J.A.; Funmilayo, H.B.; Butler-Purry, K.L., "Impact of
Distributed Generation on the IEEE 34 Node Radial Test Feeder with Overcurrent Protection," in Power Symposium, 2007. NAPS '07. 39th North American , vol., no., pp.49-57, Sept. 30 2007-Oct. 2 2007.
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Protección adaptable} Conjunto de dispositivos con la capacidad de
estimar la condición de operación de la red eléctrica y en base a ello, determinar las modificaciones en sus parámetros de ajustes para cumplir con los requisitos de confiabilidad, selectividad, tiempo de operación y sensibilidad de una protección.
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Protección de sobrecorriente (50)
13.8 kV
50
ICC = 13.8/(1.73*11.33)I50 = 0.703 kA
80%
10 ohms10 ohms
10 ohms
10 ohms
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Protección de sobrecorriente (50)
50
Zona de coberturade la protección
80%
Z = 13.8/(1.73*0.703) = 11.33 ohms%Cobertura = (11.33-3.33)/10 = 80%
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Protección de sobrecorriente (50)
50
Zona de coberturade la protección
64%
Z = 13.8/(1.73*0.703) = 11.33 ohms%Cobertura = (11.33-5)/10 = 64%
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Protección de sobrecorriente (50)
5013%
Z = 13.8/(1.73*0.703) = 11.33 ohms%Cobertura = (11.33-10)/10 = 13%
Zona de coberturade la protección
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Protección adaptable (elemento 50)
VSYS
50
I50 = VSYS/(ZTH+8)
80%
10 ohms
VR
ZTH
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Determinación de equivalentes
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Método de dos puntos (ideal)
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Sistema de prueba
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Ajuste dinámico (ajuste con 4 líneas)
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Impact of distributed generation onprotection coordination
Dr. Ernesto Vázquez MartínezUniversidad Autónoma de Nuevo León, México
MICRO-EOLO