Active full compensation device with chain structure

The invention discloses an active full compensation device of a chain type structure, which comprises a controller, a grounding transformer group, a full compensation switching high-voltage switch and a chain type compensator group, and is characterized in that the chain type compensator group is charged when a system operates normally; when grounding compensation output is carried out, the controller generates corresponding PWM signals for all the active power compensation units and issues the signals, and all the active power compensation units output voltages with the same amplitude and consistent angle. And after the output voltage of all the active power compensation units is superposed and boosted to the voltage expected by the controller, the reactive current, the active current and the harmonic current of the system to the ground are compensated. According to the invention, the ground capacitance current of the system can be independently compensated; the cascaded chained compensator group is directly