A high speed phase shifter (HSPS) is an effective device to stabilize power systems by regulating phase angle of line voltages. The HSPS has two types of primitive hardware construction, inverter-type and tap-changer type. The former, which is called a unified power flow controller (UPFC), has various functions regarding power system stability and it has been the subject of many studies. The latter is called a thyristor controlled phase shifter (TCPS). The TCPS controls the phase angle of line voltages by step regulation and has limited functions compared with the UPFC which controls it continuously. But the TCPS is a competitive device because of its simpler hardware and higher cost performance. At present there are only a few TCPS studies which deal with its functions and control method, taking into consideration its hardware. This paper deals with the essential control pattern of the TCPS for power system stabilization and phase regulating performance, considering hardware; i.e. the effectiveness of the TCPS using step-regulation in power system stabilization by simulation analysis. Furthermore, the possibility of phase control performance using step regulation is evaluated by experiments. Results shows that the TCPS using 9-step regulation is an effective device for power system stabilization.
Noriyuki Uchiyama (Hitachi Ltd.)
Masahiro Watanabe (Hitachi Ltd.)
Naoki Kasahara (Hitachi Ltd.)
Hiroshi Arita (Hitachi Ltd.)