Martin Poole, Epuron Pty Ltd - CASE STUDY | TKLN – High penetration solar-diesel hybrid systems in 3 remote NT communities

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Martin Poole, Executive Director, Epuron Pty Ltd delivered this presentation at the Remote Area Power Supply Conference. The conference brings together remote communities, mine sites and industrial operations and the renewable energy sector to outline the opportunities and barriers for solving off-grid energy challenges with renewable and hybrid energy solutions.

For more information, please visit http://www.informa.com.au/remotepower

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Martin Poole, Epuron Pty Ltd - CASE STUDY | TKLN – High penetration solar-diesel hybrid systems in 3 remote NT communities

  1. 1. TKLN  Solar     High  Penetra3on  solar-­‐diesel  hybrid  systems  in  3  remote  Northern  Territory   communi3es.   1.  High  penetra.on  solar  –  introduc.on  and  benefits   2.  Overview  of  technology  used   3.  Diesel  savings  and  power  delivered   4.  Lesson  learned   5.  Current  and  future  applica.ons   17 March 2014 Epuron Pty Ltd
  2. 2. 17 March 2014 Epuron Pty Ltd TKLN  Solar  –  High  penetra3on  solar   TKLN Solar … is the company which owns & operates solar power stations at 3 locations in the NT. The initial of each site is in the name: Ti Tree – 324 kWp Kalkarindji – 402 kWp Lake Nash – 265 kWp (also known as Alpurrurulam) = 991 kW of solar PV Lake Nash also has 3 wind turbines adding 45kW to the mix T K LN
  3. 3. There  are  many  defini.ons  but  we  mean  a  solar  power  system  which:       Supplies  up  to  85%  of  kW  which  equates  to  around  30%  of  kWh  (annual  basis)     Requires  integra.on  into  another  system   17 March 2014 Epuron Pty Ltd High  penetra3on  solar  
  4. 4. 1.  Diesel  fuel  savings.   Diesel  powered  grids  are  oQen:     Expensive  to  operate  -­‐  with  high,  unpredictable  and  oQen  vola.le  fuel  costs       Remote  –  expensive  to  deliver  fuel  to  and  to  service     Can  be  cut  off  in  the  wet  season  –  security  of  supply   Solar  integrated  into  diesel  grids  reduces     each  of  those  risks  and  adds  other  benefits:     Known  costs  for  an  annual  quan.ty  of                energy  for  20  years     Reduced  emissions  (local  and  global)   17 March 2014 Epuron Pty Ltd High  Penetra3on  Solar  -­‐  Benefits  
  5. 5. TKLN  Solar,  to  quote  PWC  from  their   recent  ARENA-­‐funded  handbook:   “…  is  an  example  of  the  technical  and   financial  viability  of  displacing  significant   volumes  of  diesel  with  high  penetra.on   solar  using  commercially  available   components”   Under  a  20  year  Power  Purchase   Agreement  PWC  purchases  an  amount  of   energy  per  annum  (MWh)  from  TKLN  Solar   Pty  Ltd  (a  wholly  owned  subsidiary  of   Epuron  Pty  Ltd)     17 March 2014 Epuron Pty Ltd High  penetra3on  solar  
  6. 6. At  each  site  there  is  an  energy  storage  system   called  a  Grid  Stability  System  (GSS)  to  supplement   solar  output.   When  clouds  reduce  solar  output  rapidly  the   GSS  supplements  output  to  reduce  the  effec.ve   rate  of  change,  providing  sufficient  .me  for  the   diesel  generator  to  adjust  to  the  increasing  load   and,  if  required,  start  a  larger  generator.   17 March 2014 Epuron Pty Ltd Overview  of  the  technology  used  
  7. 7. Because  the  system  is  high  penetra.on  it  is  important  to  be  able  to   dump  excess  solar  as  required  to  maintain  system  stability.   17 March 2014 Epuron Pty Ltd Overview  of  technology  used  
  8. 8. An  SMA  Power  Reducer  device  regulates  output  from  zero  to  100%  using  a  number   of  steps.  At  Kalkarindji,  the  largest  Solar  Power  Sta.on,  a  step  size  is  25kW.   17 March 2014 Epuron Pty Ltd Overview  of  technology  used     Diesel  generated  setpoint   was  rounded  to  1  kW  every   second       GSS  would  reduce  the  solar   to  match  it  or  reduce  to   step  size  below.         20  seconds  required  to   make  the  reduc.on       setpoint  would  have  sent     further  20  signals  by  the   .me  achieved.  
  9. 9. The  solar  now  follows  a  diesel  generated  setpoint  which  is  maintained  for  one   minute  to  ensure  the  solar  does  not  jump  unnecessarily  by  25kW  increments.   17 March 2014 Epuron Pty Ltd Overview  of  the  technology  used   Ini.al  design  refinements:     methods  for   controlling  string   inverters     Communica.ons   improvements   allowing  :     sub-­‐second   communica.on  to   inverters     Linear  control  
  10. 10. A  difficult  solar  day  with  irradiance  dropping  instantly  from  250  kW  to  50  kW  but   the  GSS  smooths  output  enough  for  the  diesels.   17 March 2014 Epuron Pty Ltd Overview  of  the  technology  used  
  11. 11. The  opera.on  of  the  baferies  is  cri.cal  to  the  smooth  interface  with  the  diesel.     Baferies  are  expensive  so  must  be  controlled  for  maximum  efficiency.   17 March 2014 Epuron Pty Ltd Overview  of  the  technology  used  
  12. 12. TKLN  -­‐  full  year   Output       -­‐  over  1.3GWh   Diesel  saved     –  around  400kL 17 March 2014 Epuron Pty Ltd Diesel  savings,  energy  delivered   0   100,000   200,000   300,000   400,000   500,000   600,000   kWh   litres  
  13. 13. Research  shows  that  as  solar  system  array   sizes  increase  there  is  an  averaging  effect   that   reduces   the   magnitude   and   rate   of   change.     ARENA   is   currently   funding   research   into   the   varia.ons   in   instantaneous   weather   effects  around  Alice  Springs.   Site  specific  resource  data   required     Lifle  data  available  at  design   stage       Only  publicly  available  1s  PV   output  in  Hawaii       showed  worst  case  output   varia.on  over  1  min  is  40%     TKLN  data  has  shown  clouds  can   reduce  solar  output  by  up  to   80%  in  1  min     Hawaii  test  site  is  five  to  six  .me   larger  than  any  of  the  TKLN   sites.     17 March 2014 Epuron Pty Ltd Lessons  learned  
  14. 14. Greater  understanding  of       the  interface  with  diesel  in   remote  grids     Response  .meframes  and   latency     Interpre.ng  opera.onal   features  in  agreements       Data  and  site  specific  input   requirements     Risk  alloca.on  and  detail     Remoteness  and  weather   impacts  on  opera.on  and   maintenance   17 March 2014 Epuron Pty Ltd Lessons  learned  
  15. 15.   All   remote   work   is   expensive   so   where   possible   all   equipment   and   controls  should  be  capable  of  being   remotely  operated.     Good  quality  equipment  and   installa.on  reduces  O&M  costs     Retrofits  are  more  expensive  than   design  inclusions   17 March 2014 Epuron Pty Ltd Lessons  learned  
  16. 16. Remote  diesel  PV  hybrids  are  infrastructure  projects  which  always  have  unknown   unknowns.   Working  collabora.vely  on  issues  is  the:     fastest,       most  effec.ve,     least  cost  way  of  moving     forward,   and  results  in  superior  learning     opportuni.es.   17 March 2014 Epuron Pty Ltd Lesson  learned  
  17. 17. The  cheapest  form  of  storage  is  diesel.   The  cheapest  way  of  controlling  the   ramp  rate  of  PV  when  a  cloud  moves   over  the  plant  will  be  predic.on.   Un.l  then,  the  GSS  works  well…   We  have  been  working  on  predic.on   using  CloudCAM  and  my  colleague  from   Fulcrum3D  will  talk  about  that   tomorrow.   17 March 2014 Epuron Pty Ltd Lessons  learned  
  18. 18. Hot  with  occasional  storms  =  very  fast  growing   weeds,  a  key  cost  in  O&M   17 March 2014 Epuron Pty Ltd Lessons  learned  
  19. 19. Current  and  Future  Applica3ons     TKLN  Solar  could  be  replicated  in  many  offgrid   loca.ons  across  Australia  and  beyond     Scaleable     Take  advantage  of  any  bafery  technology     Cloud  detec.on  and  predic.on  likely  to  reduce   storage  capex  and  opex  –  CloudCAM   17 March 2014 Epuron Pty Ltd
  20. 20. Current  and  Future  Applica3ons   The   Renewable   Energy   Target   (RET)   supports   high   penetra.on  solar  diesel  hybrid  systems.   The   main   value   driver   in   remote   diesel   grids   is   the   displacement  of  diesel.    Other  benefits  include:     Encouraging  private  investment  in  infrastructure     Reduc.on  vola.le  diesel  costs,  transport  costs     Security  of  energy  supply     Diversity  of  energy  supply     Emissions  reduc.ons     Pushing  up  the  learning  curve   17 March 2014 Epuron Pty Ltd
  21. 21. Treasurer,  Joe  Hockey  has  said;   …  it  is  now  the  turn  of  the  private  sector  to  generate  economic  growth  and  create   new  jobs,  something  governments  must  facilitate.   Solar  hybrid  systems  are  ideal  for  private  ownership:     Ins.gate  new  design     Encourage  investment     More  impetus  to  make  systems  work  and  overcome  issues   ARENA/  CEFC  involvement:     Encourages  informa.on  sharing     Which  enables  improved  system  design     Encourages  good  quality  compe..on     Drives  down  costs   17 March 2014 Epuron Pty Ltd Current  and  Future  Applica3ons  
  22. 22.   Formed  in  2003  in  response  to  John  Howard's  MRET  legisla.on  of  2001.      Started  in  wind  energy  and  now  fully  opera.onal  in  solar  power     Employs  24  people  from  its  office  in  North  Sydney,  13  of  whom  are   recent  graduate  engineers     Has  catalysed  over  $470  million     of  investment  in  Australia     Designed,  built,  owns  and     operates    TKLN  Solar     Owns  and  operates  Uterne  Power  Plant     near  Alice  Springs   17 March 2014 Epuron Pty Ltd Epuron  –  who  are  we?  
  23. 23. The  projects  were  partly  funded  by  the  Commonwealth  RRPGP,  administered  in  the   NT  by  the  Department  of  Resources   Power  and  Water  Corp      –  PPA  counterparty   MPower        –  GSS  contractor   Conergy        –  overall  EPC  contractor   O&M  contractors      –  Ben  F,  Ben  O,  Mick  and  Nookie   and  the  Communi3es  of  Ti  Tree,  Kalkarindji  and  Alpurrurulam   Some  images  from  the  PWC  “Solar  Diesel  Grid  Handbook”,  2014   17 March 2014 Epuron Pty Ltd Acknowledgments  
  24. 24. Epuron Pty Ltd   Thank  you   Mar.n  Poole   M.Poole@epuron.com.au   17 March 2014  

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