Use of Energy Storage for Levelling Wind Generation – a Parametric Approach Concerning the Capacity of the Storage

Abstract

Present  paper  examines  the  connection  of  wind generation and energy storage. Since 2007, all generator unit in Hungary has to present a schedule on its forecasted production in  15-minutes  detail.  If  the  production  exceeds  certain  area (currently  ±50%)  of  the  schedule,  a  penalty-tariff  is  to  be  paid for  the  ISO.  The  forecasting  methods  available  of  present sometimes not precise enough, thus to avoid this penalty-tariff, use  of  energy  storage  may  be  a  possible  solution.  A  computer simulation   tool   was   prepared   formerly   to   calculate   the difference in production and schedule, the income, and penalty-tariffs. Results have shown that optimal size of storage capacity mainly  depends  on  the  power  of  the  generator  and  the  penalty tariffs.  It  has  also  been  investigated  what  prices  the  system operator  can  enforce  to  encourage  producers  to  use  a  storage unit. Another aim of the paper is to investigate  whether certain site-specific  wind  parameters  can  correlate  with  the  size  of  the needed  storage.  The  goal  is  to  find  cornerstones  for  sizing  for different storage methods.