Topology of series connection type voltage transient variation compensation circuit and control method thereof

The invention discloses a series connection type voltage transient variation compensation circuit, comprising a filtering capacitor, an inverse link and a bypass switch which are connected with one another, wherein the bypass switch is connected between a power grid and loads in series; the filtering capacitor comprises a capacitor a and a capacitor b in series connection; the midpoint of the capacitor a and the capacitor b is connected with a voltage phase of the power grid; the inverse link comprises a switching tube a and a switching tube b in series connection; the switching tube a is in antiparallel connection with a diode a, and the switching tube b is in antiparallel connection with a diode b; and the midpoint of the switching tube a and the switching tube b is connected with the loads. According to the circuit, direct-current bus voltages can be respectively compensated when the power grid voltage is normal so as to keep the voltages constant; and the load voltage is compensated to keep the voltage ra