Development of Static Voltage Fluctuation Compensator for AC Electric Railway using Self-commutated Inverters
Tetsuo UZUKA, Engineer, Power Supply Systems G., Power Supply Technology Development Div., Technological Development Dept.
Shin-ichi HASE, Senior Engineer, Power Supply Systems G., Power Supply Technology Development Div., Technological Development Dept.
Yoshifumi MOCHINAGA, Chief Engineer, Power Supply Systems G., Power Supply Technology Development Div., Technological Development Dept.
"RPC: Railway Static Power Conditioner" is a static voltage compensator to avoid a voltage fluctuation of 3-phase power grid under an AC electric railway load. Normally in Japan, 3-phase electric power is transferred to paired directional single-phase feeding circuits. At a substation, RPC links directional feeding circuits using two self-commutated inverters and RPC accommodates an active power of these circuits to balance 3-phase power and compensates a reactive power to regulate a 3-phase voltage fluctuation. At a sectioning post, it can reduce voltage drop using a reactive power. Also it can act as an active filter to compensate harmonics. We report on the successful results of tests using a small model of RPC and dummy loads such as thyristor phase controlled car.