公开(公告)号：EP0569557A4

公开(公告)日：1994-12-28

申请号：EP92913731

申请日：1992-06-15

申请人： ELECTRIC POWER RES INST

发明人： LARSEN EINAR V ,  MILLER NICHOLAS W

IPC分类号： G05F1/00 ,  G05F1/20 ,  G05F5/04 ,  H02J3/18 ,  H02P13/06

CPC分类号： G05F1/20 ,  H02J3/1814 ,  H02J3/1878 ,  H02P13/06 ,  Y02E40/10 ,  Y02E40/18 ,  Y02E40/30

摘要： A faster, more controllable phase-shifting transformer system (20, 120) is provided, along with a method of retrofitting and upgrading a preexisting system for faster operation, and a method of applying a desired phase shift to the voltage on a polyphase transmission line (22, 122). A phase-shifting transformer set has series and regulating transformers (30, 40) coupled together by a switching network (50). An optional modulator (60, 80, 90) modulates the phase shift voltage about a nominal level established by the switching network (50). A thyristor augmented switching network (250, 350, 450) may have a pair of thyristor valves (206, 208; 406, 408) augmenting a reversing switch (204; 404) or a thyristor (311) augmented load tap changer (310) for varying the phase shift discreet step magnitude. For continuous effective phase shift control, a thyristor valve (416, 416', 416'') and a harmonic filter (418, 418', 418'') are in parallel with each excited winding (446, 447, 448), and a harmonic filter (414) is in parallel with each regulating winding (444).