Power & Energy Magazine - Spanish - May/June 2019 - 33

que guía la selección de la tensión con la que funcionará la
tabla 4. Aumento de capacidad después de la
línea de CC. Para ilustrar este punto, esta sección presenta
conversión
cálculos típicos para la selección de la tensión de CC al conde línea de CA a CC.
siderar las líneas de transmisión de CA existentes que funLímites máximos
cionan en diversos niveles de tensión.
totales de
La tabla 1 muestra los requisitos para los aisladores de
Contribución de
funcionamiento del
flujo total (%)
sistema (MW)
CC del CIGRE y la Comisión Electrotécnica Internacional
(IEC). Las dos últimas columnas muestran el valor de diseño
Todo
Conversión Aumento de la
Carga 1 Carga 2 CA
de CA a CC capacidad (%)
seleccionado en milímetros por kilovoltio y en pulgadas por
kilovoltio.
30
70
880
1,500
70
La tabla 2 muestra la tensión de CC seleccionada para
50
50
1,040
1,500
44
cada conversión, calculada según la distancia de fuga de
70
30
786
1,500
91
los aisladores de CA existentes y las normas de contaminación lumínica para los aisladores
de CC. Cabe señalar que, si los
235 MW
cálculos se realizaran para un sistema bajo contaminación intensa
o extrema, la conversión a CC
229.7 kV
no sería tan ventajosa porque la
tensión de CC máxima permitida
sería demasiado baja en comparación con la tensión de CA.
← 38 % (188.2 MW)
La tabla 3 muestra la comparación entre la carga máxima de la
← 28 % (141.4 MW)
← 38 % (188.2 MW)
línea de CA y la carga potencial
Línea interrumpida
de la línea de CC convertida según
240 MW
la selección de tensión anterior.
← 99% (98.6 MW)
A los fines de esta comparación,
230 kV
229 kV
137.4 kV
138 kV
el límite de carga de la línea de
CA se calculó multiplicando la
Nota:
carga de impedancia de sobretenLos flujos de línea se muestran de la siguiente manera: % de carga (carga MW)
sión por el factor apropiado según
la longitud de la línea. Existe un gráfico 11. Sistema de muestra 2.
aumento significativo de la capacidad cuando la línea se convierte
a CC para todos los niveles de
tensión. Las líneas de más de
235 MW
50 mi (80.5 km) están generalmente limitadas por la tensión o la
estabilidad, pero el objetivo de este
228.8 kV
ejercicio es ilustrar el aumento de
la capacidad térmica mediante la
conversión de CA a CC.
← 74 % (365 MW)

Consideraciones de
planificación
Esta sección examina las consideraciones de planificación del
sistema, con el objetivo de identificar líneas de transmisión de CA
elegibles que podrían beneficiarse
de una conversión de CA a CC. El
límite térmico de un circuito individual no es la única consideración
cuando al identificar la capacidad
mayo/junio 2019

← 100 % (495 MW)

← 74 % (365 MW)
Línea interrumpida

570 MW

← 75 MW

230 kV
138 kV
138 kV
Nota:
230 kV
Los flujos de línea se muestran de la siguiente manera: % de carga (carga MW)

gráfico 12. Sistema de muestra 2 después de la conversión de la línea de CA a CC.
ieee power & energy magazine

33



Power & Energy Magazine - Spanish - May/June 2019

Table of Contents for the Digital Edition of Power & Energy Magazine - Spanish - May/June 2019

Contents
Power & Energy Magazine - Spanish - May/June 2019 - Cover1
Power & Energy Magazine - Spanish - May/June 2019 - Cover2
Power & Energy Magazine - Spanish - May/June 2019 - Contents
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Power & Energy Magazine - Spanish - May/June 2019 - Cover3
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