Virtual capacitor series tuning device suitable for low-frequency electromagnetic emission system

The invention relates to the technical field of low-frequency electromagnetic emission, and discloses a virtual capacitor series tuning device suitable for a low-frequency electromagnetic emission system in order to solve the problems that the use amount of high-voltage capacitors in a series tuning device is large and adaptation of working frequency points is not flexible. The device comprises a plurality of virtual capacitor series tuning modules which are connected in series, wherein each virtual capacitor series tuning module comprises a short circuit switch, an access switch, a single-phase coupling transformer, a single-phase full bridge and a supporting capacitor; the supporting capacitor is connected with the direct-current side of the single-phase full bridge, the alternating-current side of the single-phase full bridge is connected with the secondary side of the single-phase coupling transformer, the primary side of the single-phase coupling transformer is connected to the low-frequency electromagne