coober pedy hybrid renewable project and future directions ... · • stage 1 - operating −...

Coober Pedy Hybrid Renewable Project and future directions in hybridisationTrevor Gleeson and Mark McNee

13 November 2019

• Acknowledgement

• EDL overview

• Coober Pedy Hybrid Renewable Project– high inertia

• Agnew Hybrid Renewable Project – low inertia

• Future directions

− Reducing enabler and storage cost

− Low load and variable speed engines

Outline

www.menti.com - Access code 93 52 41

http://www.menti.com/

A world of new energy

EDL overview

3

Diversified asset portfolio

419MWlandfill gas

318MWremote energy

288MWwaste coal mine gas

53MWrenewables

Australia

735MW

12MW

Greece

UK

63MW

USA

257MW

Canada

11MW

A leading global producer of sustainable distributed energy

1,078MW | 100 power stations | 5 countries29

1

10

1

59

21.8 TJ/daygas delivery (LNG/CNG/LFG)

76MW

288MW

318MW

53MW

Number of power stations


Key

Waste coal mine gas

Remote energy LNG / CNG

Landfill gas Renewables

Office

Australian operations

EDL has 59 assets across Australia.

Our global headquarters is in Brisbane, Queensland.

Diversified asset portfolio

735MWtotal installed generation capacity

59assets

76MWlandfill gas

288MWwaste coal mine gas

318MWremote energy

53MWrenewables

Australia735MW

Perth

KalamundaRed Hill

Tamala Park

Hill 60Hill 50 Leonora

Menzies

Gascoyne Junction

DarlotLaverton

Sunrise Dam

KarrathaBidyadanga

BroomeBeagle Bay

DjarindjinArdyaloon

DerbyFitzroy Crossing

Looma

Halls CreekWarmun

Pine Creek

Yulara

McArthur River

Cannington

Coober Pedy

Wingfield

BroadmeadowsBrooklyn

Corio

BerwickClaytonSpringvaleWonthaggi

Cullerin Range

Mugga Lane

Lucas HeightsBelrose, Grange AvTeralba

Jacks GullyEastern Creek

Glennies Creek

Brown PlainsBrisbane

Grosvenor

Moranbah North

Weipa

TahmoorAppin, Tower

German CreekOaky Creek

Agnew

4


Working towards ZERO harm

5

We believe that all our employees and contractors

have the right to go home

safe and well to their families

every day

Lost time injury frequency rate/hours worked (employees and contractors) October 2016– September 2019


Long-term relationships with our global customers

6


Coober Pedy South Australia

• 1.4MW avg. community load

• 3.9MW diesel

• 4.1MW wind

• 1MW ac solar

• 1MW battery

AgnewWestern Australia

• 13MW avg. mine load

• 20MW gas and diesel

• 18MW wind

• 4MW ac solar

• 13MW battery

World leading

Remote energy and hybrid renewables

7

WeipaQueensland

• 12 MW avg. mine and community load

• 26MW diesel

• 1.7MW dc solar

CanningtonQueensland

• 20MW avg. mine load

• 39MW gas and diesel

• 3MW ac solar


Coober Pedy Hybrid Renewable Project

8

This multiple award-winning project has delivered lower cost and more stable

electricity for the community at world-leading renewable energy penetration rates.

To date, the longest continuous period the project has operated on 100%

renewables was 93 hours in August 2019.

~75%of electricity supplied to Coober Pedy to date has been from renewables

93 hourslongest continuous period on 100% renewables

Equivalent to powering

1500homes p.a.

4MWwind generation

1MWsolar generation

6,000 tof carbon dioxide abated p.a.

Equivalent to removing

1800cars off the road p.a.

Adelaide

850km

• Commissioned July 2017 - three months settling, two years+ operation

• Exceeding expectations

− 74.5% over last two years - model target of 72.5%

− 75.6% RE in FY19 - target 73.5 % - higher wind

• Current record of 93 continuous hours 100% RE in August 2019

• Live dashboard and annual performance reports at https://edlenergy.com/project/coober-pedy/

• Excellent at managing renewable intermittency

− Resilient to components out of service or reduced capacity

• Very reliable - fewer outages and better power quality

− 3 years pre-hybrid - 4.3 outages p.a., 4.2 hours total

− Last year post-hybrid - 2 outages 0.5 hours total

Coober Pedy Hybrid Renewable ProjectPerformance overview

9

https://edlenergy.com/project/coober-pedy/



Solar641.4kW

606.0 W/m2

Battery18.0kW

Wind818.6kW4.0 m/s

Diesel159.0kW

Resistors381.0kW

Flywheel92.1kW

Output1,128.0 kW

Components and live dashboard

• 1MW ac, SMA SC1000XP inverter

• 1.3MW dc First Solar Series 4 PV modules

• 3MW Dynamic Resistor with thyristor control

• 2 x 850 kVA Diesel UPS (DUPS)

• Synchronous condenser• Fast start clutch

• 2 x 2.05MW SenvionMM92 wind turbines

• 1MW cont./1.5 MW peak

• Toshiba lithium titanate

• 50 ft container

• 8 x 518 kW Deutz TBD6V12

• Containerised



Parameter Units Design Actual FY 18 Post Settling

(Oct 17 - Jun 18)

20 year FY19 FY18 ActualDesign

(9 month)

Customer Load MWh 11,840 11,563 11,570 8,725 8,955

Potential Renewable MWh 16,826 18,444 17,569 12,605 12,853

Renewable “curtailed/spilled" MWh 7,138 8,550 8,728 5,603 5,525

System losses MWh 1,400 1,150 1,017 833 1,059

Net RE to customer MWh 8,288 8,744 7,824 6,169 6,269

Net RE to customer % 70.0% 75.6% 67.6% 70.7% 70.0%

Target RE to customer % 70.0% 73.5% n/a 70.5% 70.0%

Longest continuous period of 100% RE* hrs - 81* 71.5 - -

Wind speed at hub height m/s 7.6 7.9 7.6 7.5 7.6

Solar Resource (GHI) kWh/m2/pa 2,067 2,252 2,211 1,765 1,654

11

Performance to date

* 93 hours in August 2019


Typical daily performance Summer - Jan

Design

FY 2018

FY 2019

Solar

Wind

Diesel

% RE

Typical daily performance Winter – June

A world of new energy 13

Sample daily performance



14

Modelled vs actual daily performance

• PPA with Council supported by a simplified performance model that predicts RE to load from measured wind speed, solar irradiance and load

• Simplified modelling and average loss factors means daily performance gaps but good over year.

• Still some room for improvement

− Control changes; minimum engine run time, greater use of BESS, less spinning reserve

− Improving component availability

− Use of 44% of RE spilled


• PV inverter failures

− Three power stack failures in first two years – all replaced on warranty

− Root cause analysis by SMA ultimately tracked back to third party supplied internal component – entire inverter

replaced

− Remote location > 2 weeks downtime, but small impact on RE% - wind fills gap.

• BESS Container Humidity

− Toshiba specify humidity greater than 15% - BESS unavailable when approaching limit – reduced all diesel off time

− Humidifier installed - performing well.

• Dynamic Resistor Capacity Fade

− Effective kW capacity reduced over time

− Initially thought to be resistive elements but now phase angle controllers suspected

− Units replaced, but root cause investigation is ongoing.


15

Technical issues


Agnew Hybrid Renewable Project

16

EDL is delivering the Agnew Hybrid Renewable Project, a ground-breaking

energy solution for Gold Fields’ Agnew Gold Mine in Western Australia.

Once completed, the project will provide the mine with more than 50%

renewable energy over the long term, without compromising power quality or

reliability.

18MWwind generation

4MWsolar generation

54MWinstalled capacity upon project completion in 2020

13MWbattery system

47,000 tof carbon dioxide abated p.a.

Equivalent to removing

14,000cars off the road p.a.

Equivalent to powering

10,000homes p.a.

Agnew

Configuration

• 16 MW peak mine load

• Stage 1 - operating

− Thermal 8 x 2 MW gas, 2 x 1.6 MW diesel, (4 x 1 MW temporary diesels> 9 th gas engine soon)

− Solar 4 MWdc – 5 MW SMA inverter

• Stage 2

− Wind 5 x 3.6 MW Goldwind

− BESS – 13 MW/ 4 MWh SAFT

− Hydro Tasmania control system

− Commissioning Q1-2 2020

• Low inertia

• Minimum 2 engines on line, BESS to share response

• Coordinated response from engines and BESS is critical

Agnew Hybrid Renewable Project

Low inertia system targeting above 50% RE

17


Low to Medium Penetration (RE peak < Load Peak)

• System must manage

• Spinning Reserve (Engine time to take up load)

• Ramp Rates (Loads, RE variability and engine response)

• Step load capacity

• BESS & DUPS are effective at a cost

• Current engines limiting typically 50% minimum load gas

• Low Load / Variable Speed engines can address the minimum load limitations and reduce BESS & DUPS costs

• Larger RE systems have slower ramp rates which engines can potentially match without BESS / DUPS

+ UPS

Desirable Criteria Low Load / Variable Speed

• <10% load capability

• Ability to ramp quickly from low load

• Known / modellable ramp rates

• Security on OPEX

Future directions in hybridisationReducing cost of enablers and storage


Real world engine response and spinning reserve

19

Mill start = Load step 15MW to 21.2MW

Additional engines started prior

• 40% load increase – analogous to RE drop

• How much spinning reserve required

− Lower minimum load

• Can engines respond fast enough?

− Larger solar and more wind turbines lowers combined ramp rates

• Variable engine response

− G3520C gas sets and diesel sets respond first, but some slower than others

− G3516LE gas units slower to respond

− See next slide

6x G3520C gas (~60%)

9x G3516 gas (~55%)

2x 3516 diesel (~60%)

Sta

tion P

ow

er

(kW

)E

ngin

e L

oad (

kW

)

Load

Spinning Reserve

8 sec 6.2MW

7 MW

Time (2 second data)


Real world engine response and spinning reserve

20

G3520C gas

G3516 diesel (Peak 250 kW/s = 15% of rated capacity)

G3516 LE gas

• Response appears as its not coordinated• Capability varies across engine type and engine age• Response is different from different starting points (as a % of full load)

Ram

p R

ate

s (

kW

/s)

How long could it hold that for?

Dynamic response post initial event can become more critical. Careful with your transient modelling assumptions rebound > load stepBatteries are great at managing these transients


+ UPS

Future DirectionsHigher Penetration- toward 100%?

High Penetration – RE > Load

• Excess RE “Spill or Store?”

• Daily / Weekly RE variability drives large storage requirement

• Poor capital utilisation from large battery

• Commercial incentive for controllable load /new industries

What is economic for a reliable microgrid?

Future storage options

• Hydrogen

• Compressed air

• Pumped hydro

• Suspended weights

• Flywheels

Future projects

Strong interest from remote communities and miners

22

• What does the future hybrid renewable look like?

− High inertia – Coober Pedy

− Low inertia – Agnew electro-chemical battery based

− New storage options

− Combination of above and low load/variable speed recip

Innovation requires courage…Be ready to be told no or its not possible, just respectfully and professionally, keep going.

Thank you

edlenergy.com

Australia

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Tel: +61 7 3275 5555

North America

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United Kingdom

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Tel: +44 1908 953 350

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