The sliding voltage control strategy for power peaks bypass

Abstract

The  variable  speed  generating  units  have  not enough  power  reserve  for  rapid  load  step-up,  when  they  are operated at low speed with partial load. The short time power peaks delivery during the acceleration period must be provided from  separate  energy  store,  which  can  be  among  others  the ultra-capacitors   battery.   Standard   solution   connects   the capacitors  via  DC/DC  bidirectional  converter.  The  ultra-capacitors voltage varies in the range 50% what represent 75% exploitation of maximal stored energy. New concept is based on direct  connection of  ultra-capacitors  into  the inter-circuit  with controlled voltage drift only 30% and 50% energy exploitation. That means the resulting capacitance must be 50% higher, but one  converter  is  saved,  efficiency  grows  up  and  the  control becomes simpler.