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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.

Tipo Schema unifilareStandard IEEE Std 315 + ANSI device numberingMotore schematex-sldAggiornato 22/09/2026
Bess Storage
20 MW BESS substation
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La richiesta

“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.”

Prova alloraAdd a third battery block.Add a revenue meter at the POI.
Cosa contiene questo disegno

Leggi le decisioni che ne stanno alla base.

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

Domande frequenti

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.