ESCRI-SA Battery Energy Storage System

Dalrymple NorthESCRI-SA Knowledge Sharing Reference Group

Meeting # 6 - 16 September 2020

Dalrymple

North

ESCRI-SA

Battery

Energy

Storage

System

(BESS)

2

ESCRI-SA Dalrymple BESS

Project UpdateESCRI-SA Knowledge Sharing Reference Group

16 September 2020

Outline

▪ Project Update

▪ 6 Monthly Operational Report

▪ ElectraNet Perspective

▪ AGL Perspective

▪ Reflections on the impact of ESCRI-SA (ElectraNet, AGL, Advisian, ARENA)

▪ Q&A

▪ Acknowledgements

4

Project scope and objectives

5

1. Gain practical experience and learnings from the application of grid connected utility

scale battery storage as an enabler of large scale intermittent renewable energy on an

interconnected system

2. Demonstrate that utility scale battery storage can effectively provide network reliability

and security services alongside market services

3. Demonstrate network ownership of battery storage and commercial appropriate

separation of provision of regulated services and competitive energy market services

4. Demonstrate “seamless” islanded operation with 100% renewable generation following

transmission outages

Scope: Nominal 30 MW, 8 MWh lithium-ion battery

Heywood interconnector

Melbourne

Adelaide

Location at the edge of NEM

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• Connection at 33 kV at Dalrymple

substation on Yorke Peninsula – land

available

• Opportunity to reduce expected

unserved energy under islanding

conditions (max demand is about 8 MW

but on average need about 3 MW for 2

hours)

• Site is close to the 91 MW Wattle Point

Wind Farm – provides opportunity for

battery to support islanded operation

with the wind farm and 2 MW of local

rooftop solar, following network outages

Utility scale BESS near the end of a long radial line in proximity to a wind farm

ESCRI-SA

132 kV single

circuit line

Wattle Point wind farm

Adelaide

Integration at ElectraNet’s Dalrymple substation

7

66 km25 km

Dalrymple BESS30 MW / 8 MWh

Dalrymple substation

132 kV

33 kV

Wattle Point Wind Farm 91 MW(55 x Vestas V82 directly

coupled induction generators)

Load/DER-1 .. 8 MW

Images (left to right): Wind farm: Flickr https://www.flickr.com/photos/daveclarkecb/BESS: ElectraNetBESS and substation: Courtesy Google Maps

Upstream grid

BESS building

BESS and Dalrymple substation

Services provided

to customers and

NEM participants

ElectraNetowns battery &

provides regulated

services

ARENAgrant part

funding

Regulated services

Reduced unserved energy

Fast frequency response

Competitive market

servicesFCAS

Market caps

Commercial arrangements

8

Assets and

operation

Funding and

commercials

Operational

control

Availability

Guarantee

Benefits Payments

Operating

Principles

ESCRI BESS

Providing both regulated and competitive market services

AGL leases battery

from ElectraNet

and is battery

operator

EPC/ D&C contract and 12-year maintenance agreement awarded to Consolidated

Power Projects (CPP) following extensive procurement process

Reflection on Project Outcomes and

Knowledge Sharing Deliverables

Project Outcomes - Achieved

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Outcome Comment

Demonstrate the deployment and operation of a large

scale BESS to deliver a combination of network and

market benefits

Achieved. The BESS entered commercial operation on

14 December 2018

Demonstrate a contracting and ownership model to

maximise the value of a BESS

Achieved. Wattle Point wind farm integration allows AGL

use of BESS MWh capacity between 10% – 90%

Test the regulatory treatment for the ownership of

large-scale BESS by regulated transmission network

service providers

Achieved. The AER has accepted ElectraNet's proposed

regulatory treatment of the BESS at Dalrymple

Provide price discovery for the deployment of a

large-scale grid connected BESS

Achieved. Price discovery provided for capital

expenditure. Reporting on operational performance and

market revenue in Operational Reports

Highlight and address technical and regulatory

barriers in the deployment of large scale batteries

Achieved. Regulatory treatment accepted and BESS

registered by AEMO

Knowledge Sharing Portal

▪ ARENA knowledge sharing commitments

□ Project delivering substantial knowledge sharing

benefits to stakeholders

▪ Real-time data

▪ Data downloads

▪ Reports

▪ Presentations

▪ Knowledge Sharing Reference Group

□ Agendas

□ Minutes

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www.escri-sa.com.au

Portal usage

12

14/12/18 to

14/06/19

14/06/19 to

14/12/19

14/12/19 to

14/06/20Total

Page views 1241 799 683 2723

Unique page

views984 666 592 2242

Average time

on page1:54 2:14 3:04 2:13

Number of

report/

presentation

downloads

76 47 46 169

Number of

data

downloads

230 103 57 390

Knowledge Sharing Deliverables

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Deliverable Requirement Actual

Establish Knowledge Sharing Reference Group, hold

regular meetings6 6

Technical Open Days (Site visit) 2 2

Web portal with knowledge sharing material, including

operational data1 1

Formal knowledge sharing reports 7 5

Other reports and technical articles - 2

Presentation at industry conferences 6 9

Direct engagement with other industry participants

(national and international)- 6

Transfer of portal information to ARENA 1 Future

Dalrymple

North

ESCRI-SA

Battery

Energy

Storage

System

(BESS)

14

ESCRI-SA Ongoing Performance

6 Monthly Operational ReportESCRI-SA Knowledge Sharing Reference Group

16 September 2020

Outline

▪ General asset performance and metrics

▪ What O&M is occurring

▪ Safety performance and observations

▪ System events and incidents

▪ R2 model validation

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Key Metrics – First 18 months of operation

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Key Performance Metric

Value for reporting

period

(14/12/18 – 14/06/19)

Value for reporting

period

(14/06/19 – 14/12/19)

Value for reporting

period

(14/12/19 – 14/06/20)

Average BESS Availability 98.01% 97.35% 98.93%

Total Energy Consumed 1,370 MWh 2,006 MWh 1499 MWh

Total Energy Exported 160 MWh 768 MWh 198 MWh

Average auxiliary load and losses (%

of 30 MW rated capacity)2.19% 2.25% 2.35%

Number of Charge and Discharge

Cycles (per BOA definition)2 4 1

BESS Charging Cost $120,000 $101,000 $76,000

BESS Discharge Revenue $116,000 $97,000 $102,000

FCAS Revenue $1.33m $3.73m $15.6m

General Operational Issues to manage

▪ Availability

▪ Air conditioning

▪ Inverters & batteries

▪ Communications

▪ SCADA alarms

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What O&M is occurring

▪ Routine

□ Site / housekeeping

□ Air conditioners

□ CO2 fire system

□ Diesel generator

□ Inverter maintenance

▪ Corrective (some common items)

□ Air conditioners

□ Communication alarms

□ Nuisance alarms

□ Security system

▪ Specific items

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Air conditioners

▪ Since last update, all the 4 additional air conditioners have all been installed. This occurred early in this

reporting period. Reliability of the A/C has also improved.

▪ Work has mainly focussed on ducting, the idea is to produce an even cool airflow directly in front of the

inverters, rather that trying to cool the actual room.

▪ We will remove the old ducting and replace this with more directed solution.

▪ This has been done on one unit as a trial and the remaining units will be completed in early November.

▪ After this further adjustment of the A/C controls may be needed by Mitsubishi and adjustment of

temperature sensors on the inverters by ABB.

▪ Intent is conduct a high ambient temperature full discharge test when conditions allow (during Summer).

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Ducting - old

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Ducting - new

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ESCRI-SA

PCS100

BESS

Modules

23

Inverters & Control System(s)

▪ “Reboot” issue

□ There remains an issue with the controller firmware that is causing a lock up and requires a reboot every approx.

100 days. This was thought to have been fixed, however this occurred again. ABB want to try a firmware update to

resolve.

▪ Some battery banks “going flat”/off target dispatch

□ Over time as particular inverter groups experience slightly different temperature derating, the battery banks’ SOC

will tend to diverge. This will eventually require ABB to equalise charge on Powerstores (1/12th) or cause a trip on

low charge

□ ElectraNet or AGL do not have the ability to individually equalise charge

▪ Inverter failures

□ We had 2 inverter failures during this reporting period

□ Also replaced a handful of inverter cooling fans

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Batteries

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Batteries

▪ Guaranteed remaining battery MWh capacity (annual)

▪ This is determined by an annual charge discharge test.

▪ Prior to a test being conducted Samsung should conduct routine maintenance equalisation and

calibration of SOC being conducted prior. At that stage Samsung was not able to attend site to conduct

this work due to COVID-19 restrictions.

▪ An indicative charge discharge test was conducted by CPP in April 2020.

▪ Indications from this test are the energy capacity was slightly short.

▪ Samsung equalisation work has been completed in Aug 2020.

▪ Plan to re-conduct test soon with the correct test methodology.

▪ No battery rack failures in this reporting period.

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Safety performance and observations

Safety Incidents

▪ The Dalrymple North BESS site is predominately unmanned

▪ Apart from corrective maintenance, routinely there would only be site attendance 1 to 2 days a month

▪ There were zero safety incidents reported during the third six months of commercial operation

▪ This includes near miss or Lost Time Injuries

▪ Maintenance is undertaken via formalised safety procedures (SWMS/JSA managed by MSP)

Safety Notice – Fire system

▪ If a fire is detected, an audible signal will be triggered and all personnel that may be present in the

inverters or batteries room should evacuate immediately the building

▪ The fire suppression will then be activated 60 seconds later

▪ ElectraNet control centre will be notified and protocols exist as to how the fire brigade would intervene

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System Events – First 18 months

▪ 21 operational system events:

▪ sixteen of these events were single-line trips or a frequency event

▪ The other 5 events were more significant and led to the BESS supplying load to

prevent or reduce the duration of an unserved energy event

▪ High-speed data recordings from Power System Performance Monitor (PSPM)

confirmed the BESS successfully rode through the fault or responded as

required

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ESCRI-SA BESS Operating in Islanding Condition

Unplanned outages from 14 December 2019 – 14 June 2020

Unplanned outages

Over the past six months, from 14 December 2019

– 14 June 2020, the Dalrymple BESS responded to

several unplanned outages due to various reasons.

These unplanned outages are listed below:

▪ On 20 December 2019 at 13:52, the Ardrossan West –

Dalrymple 132 kV line successfully reclosed following a single

phase – ground fault resulting in the Dalrymple BESS

supplying the local load for a short period of time

▪ On 31 January 2020 at 17:59, the Ardrossan West –

Dalrymple 132 kV line successfully reclosed following a single

phase – ground fault resulting in the Dalrymple BESS

supplying the local load for a short period of time, and

▪ On 29 April 2020, inadvertent trips at Dalrymple due to tests

at the Wattle Point Wind Farm resulted in the Dalrymple

BESS supplying the local load for periods of time

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▪ On 20 December 2019 at 13:52, the Ardrossan West - Dalrymple 132kV line tripped and successfully

reclosed following a single phase to ground fault caused by lightning. The Dalrymple local supply

remained connected and supplied by the Dalrymple BESS until re-synchronisation at 13:55

Ardrossan West – Dalrymple 132 kV line trip

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▪ On Wednesday 29 April 2020 at 08:29, Dalrymple 132/33/11kV TF1 and TF2 inadvertently tripped due to

tests at the Wattle Point Wind Farm. The Dalrymple load was successfully supplied from the BESS and

operated in islanded mode for 14 minutes until attempting to re-synchronise at 08:43

▪ The BESS then tripped. Load was restored within minutes from the transmission network.

Inadvertent trips at Dalrymple

ESCRI-SA BESS Responding to System Events

Transmission single-line trips or a frequency event

ESCRI-SA BESS Performance During System Events

Over the past six months, from 14 December 2019 – 14 June 2020, six transmission network fault events

were relevant to the Dalrymple BESS, summarised below:

▪ On 20 December 2019 at 13:52, the Ardrossan West – Dalrymple 132 kV line successfully reclosed following a single phase – ground

fault

▪ On 13 January 2020 at 2:19, a CT failure at the Waterloo substation resulted in tripping various element in the Mid-North region

▪ On 31 January 2020 at 13:54, the collapse of a number of steel transmission towers on the Moorabool – Mortlake and Moorabool –

Haunted Gully 500 kV lines resulted in these lines tripping and remaining unavailable for service, effectively islanding South Australia

from the NEM

▪ On 31 January 2020 at 17:59, the Ardrossan West – Dalrymple 132 kV line successfully reclosed following a single phase – ground fault

▪ On 7 February 2020 at 11:44, the Munno Para – Blyth West 275 kV line successfully reclosed following a single phase – ground fault

▪ On 7 February 2020 at 12:26, the Clare North - Brinkworth 132kV line tripped and locked out following a 3 phase – ground fault

34

Current Transformer failure at the Waterloo substation (1/2)

▪ On the 13th January 2020 at 2:19:32, catastrophic failure of S phase CT 7022 at Waterloo resulted in

operation of the Waterloo South Bus Zone protection and CB7022 CB Fail protection. This resulted in

tripping of Waterloo TF5, Waterloo South Bus, Waterloo-Hummocks line and Hummocks TF1 (CB failed).

Dalrymple BESS response due to this fault are shown below.

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Current Transformer failure at the Waterloo substation (2/2)

Clare North - Brinkworth 132kV line trip (1/2)

▪ On 7 February 2020 at 12:26, the Clare North - Brinkworth 132kV line tripped

and locked out following a three phase to ground fault. The Dalrymple BESS

successfully rode through the fault as shown in the graphs below.

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Clare North - Brinkworth 132kV line trip (2/2)

▪ On 31 January 2020 at 13:54, the collapse of a

number of steel transmission towers on the Moorabool

– Mortlake and Moorabool – Haunted Gully 500 kV

lines resulted in these lines tripping and remaining

unavailable for service.

▪ South Australia and parts of Victoria, including

Mortlake Power Station and APD (Alcoa Portland),

were islanded from the NEM.

▪ Prior to the time when the double circuit tripped, SA

was exporting approximately 515 MW. SA system

demand was approximately 2648 MW. There were 7

conventional generators online at the time in SA, with a

total output of 1559 MW.

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South Australia islanding from the NEM (1/2)

▪ Dalrymple BESS response due to this over-frequency

event is illustrated in the graphs to the right.

▪ Power flow on the Heywood interconnector and frequency

measured at South East substation are illustrated in the

graph below.

40

South Australia islanding

from the NEM (2/2)

ESCRI-SA BESS R2 model validation

42

Traditional Connection application process

I. Finalise initial R1 model package (PSSE, PSCAD &

Power factory)

II. Finalise generator performance standard (GPS)

III. Finalise customer performance standard (CPS)

IV. Commissioning tests (hold point test)

V. Submit final R2 model package

ESCRI islanding

- Model validation for islanding tests (PSCAD)

- Islanding tests with loads

- Islanding tests with wind farm and loads

- Black start tests

+

R2 model validation process

Single set of parameters required for seamless transition from grid connected to islanded operation

Issues raised from R2 test

▪ Major: Power system modelling guideline non-compliant

□ Voltage and reactive power responses from simulation models in voltage control mode are outside the 10% band

requirement for S5.2.5.13 assessment

− No limiter operation

− Limiter operation

□ ( primary control mode is power factor)

▪ Minor: Model fixing

□ Better alignment of PSSE and PSCAD models, especially with inertia response/ overload capability response

□ Long PSCAD model initialisation time

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Voltage at 33 kV Reactive power at 33 kV

30 MW discharge with + 5% voltage step – Improved performance with new model

R2 test performance

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System frequency at 33 kV Active power response from ESCRI at 33 kV

SA islanded

R2 system event performance - 31 January 2020PSSE model does not

have the islanded

operation functionality

Very good actual performance vs. PSSE & PSCAD model alignment

Thank you

Hugo Klingenberg

Laurie Antal

Viet Trinh

Fida Rafi