Control method and device for alternating-current and direct-current conversion circuit, and computer storage medium

An apparatus for controlling an alternating current-direct current (AC/DC) conversion circuit, comprising:

• at least one processor;
• and
• a memory communicated and connected to the at least one processor,
• wherein the memory stores instructions executable by the at least one processor, the instructions, when executed by the at least one processor, cause the at least one processor to perform a method comprising:
• acquiring voltage information and current information of the AC/DC conversion circuit;
• and
• controlling, according to the voltage information and the current information of the AC/DC conversion circuit, a controllable device in a first converter unit to be switched on in delay or switched off in advance, and controlling a second converter unit to operate in a controllable rectification state or a controllable inversion state or an uncontrollable rectification state,
• wherein after acquiring voltage information and current information of the AC/DC conversion circuit, the method further comprises:
• calculating capacitor voltage biases, each for a respective one of first converter units of all phases connected to the same coupling unit;
• determining whether there is a capacitor voltage bias among the capacitor voltage biases exceeding a preset value;
• and
• in response to that there is a capacitor voltage bias exceeding the preset value, determining to lock a trigger pulse of at least one of the phases according to the capacitor voltage bias exceeding the preset value;
• and
• wherein the AC/DC conversion circuit comprises the first converter unit, the second converter unit and a coupling unit, the first converter unit is connected to an input terminal of the coupling unit, the second converter unit is connected to an output terminal of the coupling unit.

A non-transitory computer-readable storage medium, in which a computer program is stored, wherein the computer program is executed by a processor to implement a method comprising:

• acquiring voltage information and current information of the AC/DC conversion circuit;
• and
• controlling, according to the voltage information and the current information of the AC/DC conversion circuit, a controllable device in a first converter unit to be switched on in delay or switched off in advance, and controlling a second converter unit to operate in a controllable rectification state or a controllable inversion state or an uncontrollable rectification state,
• wherein after acquiring voltage information and current information of the AC/DC conversion circuit, the method further comprises:
• calculating capacitor voltage biases, each for a respective one of first converter units of all phases connected to the same coupling unit;
• determining whether there is a capacitor voltage bias among the capacitor voltage biases exceeding a preset value;
• and
• in response to that there is a capacitor voltage bias exceeding the reset value determining to lock a trigger pulse of at least one of the phases according to the capacitor voltage bias exceeding the preset value;
• and
• wherein the AC/DC conversion circuit comprises the first converter unit, the second converter unit and a coupling unit, the first converter unit is connected to an input terminal of the coupling unit, the second converter unit is connected to an output terminal of the coupling unit.