Control method and device for three-phase alternating-current variable-frequency air conditioner

The invention discloses a control method and device for a three-phase alternating-current variable-frequency air conditioner. The control method comprises the steps that S1, an indoor temperature value, a temperature set value of a remote controller and controller parameters are obtained, wherein the controller parameters comprise a proportionality coefficient of a rotating speed controller and an integral coefficient of the rotating speed controller; S2, calculation is conducted according to a first preset formula on the basis of the temperature set value and the indoor temperature value to obtain a temperature deviation value; S3, a target refrigeration mode of the three-phase alternating-current variable-frequency air conditioner is determined according to the temperature deviation value; S4, the real-time rotating speed of a variable frequency transformer is adjusted to a rotating speed given value corresponding to the target refrigeration mode; S5, a target armature voltage is obtained according to a thi