IEEE Power & Energy Magazine - Spanish - May/June 2021 - 87

Cuando la microrred está conectada a la fuente de los servicios
públicos, se aplican los principios generales de protección
que normalmente se aplican en las interconexiones de pequeños
generadores. Los servicios públicos proporciona una cierta
cantidad de corriente de falla disponible, y la protección primaria
del sistema de servicios públicos y la microrred, incluidas
las FED, se basa en elementos de sobrecorriente. Cuando
ocurren fallas, ya sea en el sistema de servicios públicos o dentro
de la microrred, los relés de protección están programados
para responder a estas condiciones de falla a fin de proteger la
microrred y el equipo y el personal de los servicios públicos.
Cuando ocurren fallas mientras está conectado a la red,
la coordinación selectiva y el aislamiento de fallas se logran
a través de diferentes operaciones. En los interruptores de
interconexión de la microrred y los interruptores FED, la
potencia y la corriente de falla pueden fluir en ambas direcciones
según las condiciones de operación. Por lo tanto, el
sistema detecta y aísla fallas usando un esquema de bloqueo
direccional, que utiliza sobrecorriente direccional y señales
Subestación de suministro
de servicios públicos
CB52-2
52
Línea de alimentación de servicios
públicos de 44 kV
44 kV
12 kV
52
Una parte del sistema de servicios
públicos puede quedar inadvertidamente
en modo de isla cuando se abre el interruptor del
alimentador de servicios públicos
CB52-2 (o cualquier otro dispositivo
entre CB52-2 y CB1 o CB2).
La protección del sistema debe evitar
el modo de isla involuntario.
de bloqueo basadas en comunicación para minimizar el
tiempo de compensación mientras se mantiene la selectividad.
Los cogeneradores están protegidos mediante elementos
de protección direccionales de sobrecorriente, tensión
y frecuencia. Los alimentadores de carga y otros equipos
están protegidos principalmente mediante protección de
sobrecorriente de fase y tierra.
En el caso de fallas descendentes de los interruptores
del alimentador de carga principal mientras están conectados
a la red, se espera que los cogeneradores y el sistema de
almacenamiento de energía por baterías superen la falla y
permanezcan en línea. Los inversores FV pueden dispararse
debido a la protección contra el modo de isla basada en tensión
y frecuencia de los inversores.
Respuesta de protección a fallas
en el sistema de servicios públicos
Cuando están conectados a la red, las FED de microrred
pueden contribuir a fallas de cortocircuito en el sistema de
Microrred
CB1
(Punto de interconexión) CB2
K
CA
CC
CA
CC
Cargas
de los clientes
figura 5. Un diagrama que muestra la posibilidad del modo de isla accidental.
mayo/junio 2021
ieee power & energy magazine
87

IEEE Power & Energy Magazine - Spanish - May/June 2021

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - Spanish - May/June 2021

Contents
IEEE Power & Energy Magazine - Spanish - May/June 2021 - Cover1
IEEE Power & Energy Magazine - Spanish - May/June 2021 - Cover2
IEEE Power & Energy Magazine - Spanish - May/June 2021 - Contents
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IEEE Power & Energy Magazine - Spanish - May/June 2021 - Cover3
IEEE Power & Energy Magazine - Spanish - May/June 2021 - Cover4
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