Capacitance-adjustable series capacitor fixed compensation boosting device and control method

The invention relates to the technical field of intelligent power distribution, and provides a capacitance-adjustable series capacitor fixed compensation boosting device and a control method. The capacitance-adjustable series capacitor fixed compensation boosting device comprises a bypass circuit breaker QF1, fuses FU1-FUn, capacitors C1-Cn, current transformers TA1-TAn, a static switch STS, an electric reactor L, a resistor R, a contactor KM11, a capacitor C11, a current transformer TA11, a fuse FU11, voltage transformers TV and TV1, a current transformer TA, and maintenance circuit breakers QF2 and QF3. Wherein the static switch STS receives a command of a controller, and the tail end voltage of a capacitor series fixed compensation line is realized; and the controller controls the contactor KM11 to switch on and switch off the capacitor C11 so as to realize fine tuning of the terminal voltage. The fixed compensation boosting device is small in silicon controlled rectifier number, a holding contactor is omi