General Overview & Storage Technology EOS...

General Overview & Storage Technology EOS 09-0070

Smarter Network Storage – Training Slides v05

2011. UK Power Networks. All rights reserved

Training in modules

Training Themes Today

General Overview and Storage Technology

Manual Control – ENMAC & BESSM HMI

Isolation Procedures

Health & Safety – Site Emergency Response

Inspection & Maintenance

Network Service Scheduling

Commercial Service Scheduling


Contents

• Introduction to Leighton Buzzard SNS • Technology Introduction • Forecasting, scheduling and controls • Storage use cases


Background to SNS

• Constructed 2013-14 as part of LCNF Project ‘Smarter Network Storage’ (SNS)

• Aim: To support security of supply at Leighton Buzzard Primary, while delivering additional commercial market services to improve the economics

• Deferring addition of 3rd circuit from Sundon grid to Leighton Buzzard

6 MW Power 10 MWh Energy


Storage 101

Power Conversion System

Inverter Inverter

Control System • Control system that drives

overall storage system

Storage

Battery Cells Battery

Cells Battery

Cells Battery

Cells Battery

Cells Battery

Cells Battery

Cells Battery

Cells Battery

Cells

• On site control system (BESSM). Separate scheduling by commercial system (FOSS).

• Power conversion systems convert DC energy from batteries AC, before voltage transformation and connection to the network.

• Larger inverter ratings allow the system to import/export higher power levels

Network Connection

• Modular Storage Technology (e.g. battery cells), providing capacity to store energy.

• Larger storage capacity allows the system to import/export for longer

• Inverter systems from S&C Electric. • 6MW Total Power rating • 3 x 2 MW (2.5 MVA) units

• Storage technology from Samsung SDI.

• 50,688 cells, providing 10MWh of energy storage capacity

DC

AC

∼700V

480V

11kV

General Information Leighton Buzzard SNS


Site Introduction

Leighton Buzzard SNS -

Storage Facility

Existing Transformer and

Isolator compound

Existing Switch house (entry

door)

LV Supply Unit Substations

Access and parking for

storage facility

Access and parking for

switch house


Electrical Connection


Leighton Buzzard SNS

Facility Layout

Battery Room

Inverter and Transformer Room

Control / IT Room

11kV Switch Room

Fire Suppression Room

Lobby


Leighton Buzzard SNS

Facility Layout


Disabling fire suppression system

• Turn handle to “closed” position

• Alarm will sound on control panel

• Press “Silence Alarm” button on control panel

Guidance notes Manual isolator

handle (lockable)


Battery Room Components < Back to Layout

Battery Array

Vertical ‘String’ – 12 Trays & 1 Switchgear

Tray

Switchgear / String Management System

Array

Strings

Battery Trays

• 12 Battery Arrays • Each array has 22 strings • Each string comprises 12

trays and 1 switchgear (string management system) at the top


Battery Room Components

BAX = Battery Array X BSXX = Battery String XX 1, 2…12 = Tray Number

Labelling Terminology

< Back to Layout

• Each tray is uniquely numbered • Strings are isolated from the DC busbar

via isolator switches Isolator switches

on the DC busbar


Battery Room – Key Points

• Battery cells contain stored energy that cannot be earthed or isolated and will always remain at voltage

• Keep hands and conductive materials, including tools and jewelry, away from tray terminals

• Be aware of your nearest emergency exit • Maintenance is done down to the tray level – trays

should not be opened to inspect or handle individual cells

< Back to Layout


Inverter and Transformer Room Power Conversion System (Inverters), 2MW (2.5MVA) < Back to Layout

Power electronic converters

DC circuit breaker for

second array

DC circuit breaker for first

array

AC CB for “Right” inverter

AC CB for “Left”

inverter

DC Cabling from

Battery Arrays


Inverter and Transformer Room 2.5MVA Transformers, 480V/11kV

MIDEL filled

insulating oil

Winding Temperature

indicator

AC LV (480V) cabling

< Back to Layout

11kV AC cabling

Loud cooling system


11kV Switch Room

To/From Primary

To/From Transformers 1-3 Future

11kV Switchboard

11kV Metering

• Access to the switchboard is via normal operational locks

• Normal operational practices and restrictions apply

Building Security, CCTV Control Box

< Back to Layout


Control Systems & the IT Room < Back to Layout

Forecasting & Optimisation &

Scheduling System (FOSS)

Battery Energy Storage System Manager

(BESSM)

• Forecasts local demand to estimate peak shaving needs

• Schedules commercial services • Provides suggested schedule to ESS • Hosted on corporate network

• Executes scheduled services, responding to network conditions

• Instructs the power conversion systems • Manages state of charge across arrays • Hosted at site

Schedule of applications/services

Network and system state

ENM

AC

Network state, Switching, info and alarms

For details on how to use the FOSS and BESSM system, see other training modules: “Manual Control” and Network and Service Scheduling


How does it support the network?

20

25

30

35

40

45

00:00 12:00 00:00 12:00 00:00

MVA

Time

Site Demand 20/12/10 - 21/12/10DemandN-1 rating

Periods of limited network security are forecast by FOSS

(based on single-circuit conditions)

20

25

30

35

40

45

00:00 12:00 00:00 12:00 00:00

MVA

Time

Site Demand 20/12/10 - 21/12/10DemandN-1 rating

Forward reservation of storage capacity for

network security (& storage pre-charge)

BESSM

Optimisation & Scheduling of additional /

external services

Additional Services / Value Streams

1. 2.

3.

4. Forward schedule

of suggested applications

communicated to storage system

When scheduled, the storage automatically responds if demand exceeds security

thresholds, with control room visibility/override

5.

Third-party signals – to initiate utilisation of external services, with control room

visibility/override

6.


Primary Application – Peak Shaving

Leighton Buzzard SNS – Storage Facility

X

X X

X X

11 kV PCS 01 CB

11 kV PCS 02 CB

11 kV PCS 03 CB

11 kV PCS 04 CB

PCS T 1

PCS T 2

PCS T 3

Outgoing 11kV Feeders


State of C

harge


State of C

harge Primary Application – Peak Shaving

Leighton Buzzard SNS – Storage Facility

X

X X

X X

11 kV PCS 01 CB

11 kV PCS 02 CB

11 kV PCS 03 CB

11 kV PCS 04 CB

PCS T 1

PCS T 2

PCS T 3



The storage exports to cover some of the demand, which reduces the load carried by the incoming circuit. The storage rating is sufficient to cover 10MWh of energy, with a peak output of 6MW

If a circuit is out of service, at times of peak demand, the remaining circuit could be carrying more than its designed loading limit


How long can support be provided?

Real Power (MW)

Minutes available (assuming 100% charge)

10MWh

Note – Reactive power is available from the PCS units indefinitely


Secondary Applications

• Dynamic Frequency Response – Dynamic import or export in response to real time frequency measurements to support national system frequency

• Static Frequency Response – A single, full import or export in response to a frequency event

• Reserve (STOR) – A single full export in response to an external trigger signal. Used to provide backup in the event of transmission system outages

• Tolling – A fixed profile of daily import and export, typically at full power over the course of a week

Outages, faults and maintenance must be notified to the battery manager and/or scheduled in FOSS to ensure secondary commercial applications are not interrupted:

All services (except reserve (STOR)) may require an import of energy from the network. This is scheduled only when it is forecast network limits will allow.


Acronym quiz

1. SNS 2. ESD 3. LVAC 4. PCS 5. BESSM 6. HVAC 7. BESDM 8. FOSS

1. Smarter Network Storage 2. Energy Storage Device 3. Low Voltage Alternating Current 4. Power Conversion System 5. Battery Energy Storage System Manager 6. High Voltage Alternating Current /

Heating, Ventilation & Air Conditioning 7. Battery Energy Storage Device Manager 8. Forecasting, Optimisation and

Scheduling System

http://www.ukpowernetworks.co.uk/innovation

http://innovation.ukpowernetworks.co.uk/innovation/en/Projects/tier-2-projects/Smarter-Network-Storage-(SNS)/

General Overview & Storage Technology EOS...

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