“Draw a single-line diagram for a 20 MW utility BESS with two 10 MWh battery blocks, two 10 MW PCS units, a 690 V collection bus, 25 MVA 690 V to 34.5 kV transformer, intertie breaker, and 25/27/81 protection relay.”
Entenda as decisões por trás dele.
Each 10 MWh battery block has its own 10 MW PCS.
The PCS outputs combine on a 690 V bus before voltage transformation.
The 25 MVA GSU provides capacity above the 20 MW nominal conversion rating.
An intertie breaker and 25/27/81 relay protect the 34.5 kV point of interconnection.
This pattern suits a modular utility-scale BESS with a collector-system interconnection. The final project requires detailed relay coordination, grounding, and utility telemetry design.
Dúvidas comuns
Why are PCS blocks modular?
Modular PCS blocks simplify procurement, maintenance, and staged expansion.
What is a GSU transformer?
A generator step-up transformer raises low-voltage PCS output to the medium-voltage interconnection level.
What do 25/27/81 mean?
They are ANSI device numbers for synchronism check, undervoltage, and frequency protection functions.