The KSTSF low-voltage dynamic filter compensation device can set up multiple filter circuits (FC) according to the user's load characteristics; through the filter compensation dedicated intelligent control unit (KSCT/TF), and adopts unique zero-crossing switching technology to control high-power SCR modules (KSTSM) Switching filter branch (KSFC), dynamic reactive power compensation and filtering high-order harmonics, full dynamic response time <20ms, no transition, no inrush current during switching process, so that voltage and current return to sine wave, power The factor is increased to above 0.95 to achieve the purpose of improving power quality.