Disclosed in embodiments of the present application are a voltage control method and apparatus, a household appliance, a computer storage medium, and a computer program. The voltage control method comprises: obtaining two half-bus voltages on a direct current side of a three-level converter, the overvoltage protection value of the two half-bus voltages, and the voltage required by a first load, wherein the first load represents a load of which the supply power voltage is any one of the two half-bus voltages; determining a voltage control policy according to the relation among the two half-bus voltages, the overvoltage protection value, and the voltage required by the first load, wherein the voltage control policy is used for compensating for the output duty ratio of a switching device of the three-level converter, so that the first half-bus voltage is greater than or equal to the voltage required by the first load, and each of the two half-bus voltages is less than or equal to the overvoltage protection value; the first half-bus voltage represents a half-bus voltage at which power is supplied to the first load; and performing voltage control on the two half-bus voltages according to the voltage control policy.