دانلود Application of STATCOM to an Industrial Distribution System Connected to a Weak Utility System

Abstract

The application of STATCOM or STATCON  is  common  in  transmission  systems—the  device  has  a  capability  of  P-Q  control  in  4 quadrants.  DSTATCOM  (for  distribution  systems) and DVR (Dynamic Voltage Regulator) are somewhat synonymous. The paper describes a unique distribution system with three in-plant generators  and  an  interconnection  to  weak  utility system at 44 kV; the three-phase short-circuit level at  the  utility  source  is  only  151.7  MVA.  So  long  as the generators are in operation, the power factor at the utility interconnection can be maintained close to  unity  and  the  voltage  profile  in  the  system  are acceptable—a total of 64 MW of load is served from 3-13.8  kV  interconnected  bus  system.  To  control the  voltage  dips  on  loss  of  generation  31  Mvar  of capacitor  filters  (as  the  distribution  system  has considerable drive system loads, and harmonic analysis  study  is  conducted)  are  installed,  yet  the voltage dip can exceed 25%. A STATCOM can restore  the  voltage  in  ½  cycle.  The  STATCOM  is also  briefly  compared  with  other  technologies  like TCR and TSC.