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BESS · Utility scale · Substation

20 MW utility-scale BESS substation

This utility-scale BESS single line diagram represents a 20 MW storage plant built from two equal battery and PCS blocks. Each 10 MWh DC block connects to a 10 MW power conversion system. Their 690 V outputs meet on a collection bus and are transformed to 34.5 kV for the grid point of interconnection.

Type Schéma unifilaireNorme IEEE Std 315 + ANSI device numberingMoteur schematex-sldMis à jour 22/09/2026
Bess Storage
20 MW BESS substation
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La demande

“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.”

Essayez ensuiteAdd a third battery block.Add a revenue meter at the POI.
Ce que contient ce dessin

Comprenez les décisions qui le sous-tendent.

01

Each 10 MWh battery block has its own 10 MW PCS.

02

The PCS outputs combine on a 690 V bus before voltage transformation.

03

The 25 MVA GSU provides capacity above the 20 MW nominal conversion rating.

04

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.

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FAQ

Questions fréquentes

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.