Control system of low-frequency current generation of current converter with chain-type structure

The invention discloses a control system of low-frequency current generation of a current converter with a chain-type structure. The control system mainly consists of a general direct-voltage controller, a unit direct-voltage controller, a current tracking controller and the like, wherein the sum of low-frequency current and the output of the general direct-voltage controller are used as the general input of the current tracking controller; the outputs of the current tracking controller and the unit direct-voltage controller are used as the input of a modulating wave generator; the outputs of the modulating wave generator and a wave carrier generator are used as the input of a pulse generator; and finally, the output of the pulse generator is sent to the corresponding IGBT (insulated gate bipolar transistor) grid electrode. By utilizing the control system, the consistency of the direct-current voltage of each link can be ensured under the condition that the direct-current voltage is inevitably fluctuated at l