Convertible static compensator employing modularization multi-level converter structure

The utility model relates to a convertible static compensator employing a modularization multi-level converter structure. The convertible static compensator comprises a static synchronization compensator, a static synchronization series compensator, and a series transformer (12). The static synchronization compensator includes a converter (7) and a transformer; and the static synchronization series compensator includes a converter (9), a series transformer (10) and a change-over switch. One end of the converter (7) is connected in parallel to a power transmission circuit I by a shunt transformer (8); the other end of the converter (7) is connected with one end of the converter (9); the other end of the converter (9) is connected to a power transmission circuit II successively through the change-over switch and the series transformer (10); and the series transformer (12) is connected in series to the power transmission circuit I. According to the scheme provided by the utility model, the technical difficulty of series connection of devices can be solved, so that the phase-splitting controlling and the modularization design can be realized conveniently; the redundancy technology is used to realize fault unit bypassing, thereby improving the reliability of the device running; and the frequency of the device switch is low and the loss of the device running is low.