The invention discloses a static synchronous compensator device of a three-phase three-bridge-arm power distribution network and a control method. The static synchronous compensator device is specially composed of a pre-charging circuit, a control module, a
power module, a protection module and a human-computer
interaction interface. The static synchronous compensator device has the advantages that the problem of
impact current produced by high-
voltage network-hanging start and
voltage rise and fall of the device is solved by utilizing forward characteristics of the pre-charging circuit and an inverse proportional function; the device has a friendly human-computer
interaction interface, the selectable reactive compensation mode and operation information display of the device can be achieved, and the device is more humanized and intelligentized; 3, the idle handling capacity can be ensured according to a power distribution network
voltage environment; 4, a traditional lowpass filtering method is replaced by adopting a movable pointer
average filter method and a novel approach
smoothing crest method, the operating efficiency of an
algorithm routine is improved, and the problem of reactive current detection delaying is eliminated. The cost of the device is reduced, the technical contents of the reactive compensation device are enriched, and the device has a certain reference value on
engineering application.