Improving Interconnection: Integrated Distribution Planning
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Improving Interconnection: Integrated Distribution Planning

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In areas with robust distributed generation (DG) growth, applications to interconnect new solar systems have overwhelmed utility interconnection processes and caused project delays and, in some cases, ...

In areas with robust distributed generation (DG) growth, applications to interconnect new solar systems have overwhelmed utility interconnection processes and caused project delays and, in some cases, prohibitive cost increases. To better facilitate interconnection of high penetrations of DG, some utilities are beginning to consider approaches to proactively study distribution circuits in an effort to determine their hosting capacities in advance. Sky discussed a concept paper IREC released this year that discusses proactive planning efforts that are being contemplated or implemented by utilities across the United States.

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Improving Interconnection: Integrated Distribution Planning Improving Interconnection: Integrated Distribution Planning Presentation Transcript

  • Improving  Interconnec.on:     Integrated  Distribu.on  Planning Sky  C.  Stanfield   1
  •   What  is  the  Problem?       2  
  • Successful  promo.on  of  renewable  resources   increased  na.onwide  interconnec.ons  to  over   90,000  PV  systems  in  2012.     That  number  is  predicted  to  rise  to  150,000  PV   systems  in  2015.     The  number  of  interconnec.on  requests  is  much   higher.     Current  interconnec.on  procedures  are  largely   reac.ve   3   View slide
  •   DG  Penetra.on  Compared  to  Es.mated  Hos.ng  Capacity   Es'mated  Hos'ng   Capacity  of  Circuit  Based   on  Customer  Load*   Installed  DG   Capacity   Solar’s  Success  Also     Means  Higher  Penetra.ons  On   U.lity  Distribu.on  Systems   Penetra'on  Level   *  The  two  most  common  es'mates  of  hos'ng  capacity  based  on   customer  load  are  15%  of  peak  load  and  100%  of  minimum  load.   4   View slide
  • Over  20%  of  distribu'on  circuits  in   Hawaii  were  over  15%  of  peak  load   in  January  2013.       Pepco  has  closed  a  number  of  its   distribu'on  system  feeders  to   further  DG  development  because   of  high  penetra'ons.     5
  • Some  states  and  u'li'es  are  taking   significant  steps  to  bePer  integrate   high  penetra'ons  of  PV  into  u'lity   distribu'on  systems.   6
  •   A  Possible  Par.al  Solu.on:   Proac.ve,  Integrated   Distribu.on  Planning       7  
  • Summary  of  Integrated  Distribu.on  Planning   • IDP  Proac'vely  plans  distribu'on  systems  to  accommodate  DG   before  interconnec'on  screens  are  applied.       • IDP  informs  the  processing  of  subsequent  interconnec.on   requests  by  determining  in  advance  the  level  of  penetra'on  that   can  be  accommodated  without  impacts.       • For  higher  penetra'on  levels,  IDP  gives  a  u.lity    advanced   knowledge  of  the  upgrades  that  may  be  required  to  maintain   safety,  reliability  and  power  quality.     8  
  • The  5  Steps  of  IDP   1 Forecast  DG  Growth  on  the  Circuit   2 Establish  the  Hos'ng  Capacity  and     Allowable  Penetra'on  Level   3 Determine  Available  Capacity  on  the   Distribu'on  Circuit   4 Plan  Upgrades  and  Expedite  Interconnec'on   Procedures  Based  on  IDP   5 Publish  the  Results   9  
  • 1   Forecast  DG  Growth  on  the  Circuit   U'li'es  can  focus  on  circuits  where  significant   addi'onal  DG  development  is  likely,  i.e.,  establish  a   trigger  point  for  IDP  study  such  as  when  DG  capacity   surpasses  15%  of  peak  load.     A  reasonable  forecast  of  incremental  DG  could  include   the  exis'ng  interconnec'on  queue  plus  a  reasonable   predic'on  of  growth  based  on  market  condi'ons  and   policy  mo'va'ons.     10  
  • 2 Establish  the  Hos.ng  Capacity  and     Allowable  Penetra.on  Level   Many  factors  affect  hos.ng  capacity,  including  circuit   characteris'cs  and  the  size,  loca'on  and  type  of  generators.  Need   for  detailed,  accurate  models.     Proac've  circuit  study  can  iden.fy  circuit  characteris.cs  that  may   need  to  be  modified  if  forecasted  levels  of  DG  growth  materialize.         Such  iden'fica'on  will  allow  u'li'es  to  make  an  es.mate  of   hos.ng  capacity,  which  reveals  an  allowable  penetra.on  level,   i.e.,  the  maximum  amount  of  genera'on  of  a  certain  type  and  size   that  can  be  interconnected  in  a  certain  area  with  confidence  that   11   system  impacts  are  unlikely.  
  • 3 Determine  Available  Capacity  on  the   Distribu.on  Circuit   Hos'ng   Capacity  is  available  –  and   Capacity   upgrades  are  not  needed  –     when  forecasted  genera.on     is  less  than  infrastructure’s     hos.ng  capacity.   Forecasted     Genera'on     Available  capacity  may  need  to   Exis'ng   be  differen'ated  by  generator   Genera'on   types,  sizes  and  loca'ons.     Available  Capacity   Current   Penetra'on  Level   12  
  • 4 Plan  Upgrades  and  Expedite   Interconnec.on  Procedures  Based  on  IDP   Forecasted   Genera'on   When  forecasted   genera.on  exceeds   infrastructure’s  hos.ng   Exis'ng   capacity,  the  u'lity  can   Genera'on   iden'fy  the  technical   factors  limi'ng  DG   development  and   determine  whether  a   minor  or  major  upgrade  is   needed.   Poten'al  Infrastructure   Investments   Hos'ng   Capacity   Current   Penetra'on  Level   13  
  • 4 Plan  Upgrades  and  Expedite   Interconnec.on  Procedures  Based  on  IDP   Iden'fying  technical  factors  limi'ng  DG  expansion  can   be  used  two  ways:     1.  On  an  aggregate  level,  it  can  give  the  u'lity  the  opportunity  to   iden.fy  and  priori.ze  the  possible  upgrades  to  distribu.on   infrastructure  that  would  be  required  to  accommodate   an'cipated  DG  growth.       2.  It  can  be  used  on  a  project-­‐by-­‐project  basis  to  inform  the   interconnec.on  screens  and  procedures  that  are  applied  to   each  facility  individually.     14  
  • 5 Publish  the  Results   Ideally,  a  u'lity  will  publish:     •  Es'mated  hos'ng  capacity  and  allowable   penetra'on  levels     •  The  loca'on  and  'ming  of  any  planned  upgrades       15  
  • THANKS to our generous sponsors for the 2013 3iForum and 3iAwards
  • For  more,  see  the  full  paper:  Integrated  Distribu'on  Planning:  A   Proac've  Approach  for  Accommoda'ng  High  Penetra'ons  of   Distributed  Genera'on  Resources,  by  Tim  Lindl  and  Kevin  Fox,  IREC;   Abraham  Ellis  and  Robert  Broderick,  Sandia  Na'onal  Lab   Thanks  to  Tim  Lindl  for  the  generous  use  of  his  presenta.on  slides     Sky Stanfield Keyes, Fox & Wiedman LLP (510) 314-8204 sstanfield@kfwlaw.com   17