SBW and DBW single-phase and three-phase high power full-automatic compensating power voltage stabilzier are designed for stabilizing AC current by importing and absorbing the advanced technology from Westem Europe, and conforming to the situation in our country simultaneously. When the voltage fluetuation of outside power-supply network or the load change causes the voltage to be fluctuated, it can automatically keep the output voltage stable. Compared with the other stabilizer, the series products have the advantages of large capacity, high efficiency, no waveform distortion, stable voltage control and so on. Furthermore, the series stabilizer own the wide service load, the capacity for bearing the monentary overload, long-term continuous operation, the switching for manual and automatic protection against mechanical failure, small size, light weight, easy installation and operation, reliable operation, etc.