A method for controlling a generator-side terminal voltage of a converter, characterized in that the method comprises: determining a target value upper limit of the generator-side terminal voltage based on a current voltage value of a direct-current bus of the converter, wherein the generator-side terminal voltage is a terminal voltage of a generator whose output terminal is connected to the converter; determining a target value of the generator-side terminal voltage that is able to minimize a generator-side current at present, and using the determined target value of the generator-side terminal voltage as an optimal target value of the generator-side terminal voltage, wherein the generator-side current is an output current of the generator; setting the target value of the generator-side terminal voltage based on the determined target value upper limit of the generator-side terminal voltage and the optimal target value of the generator-side terminal voltage, wherein the step of setting the target value of the generator-side terminal voltage based on the determined target value upper limit of the generator-side terminal voltage and the optimal target value of the generator-side terminal voltage comprises: setting, under a condition that the determined optimal target value of the generator-side terminal voltage exceeds the determined target value upper limit of the generator-side terminal voltage, the target value of the generator-side terminal voltage as the determined target value upper limit of the generator-side terminal voltage; setting, under a condition that the determined optimal target value of the generator-side terminal voltage does not exceed the determined target value upper limit of the generator-side terminal voltage, the target value of the generator-side terminal voltage as the determined optimal target value of the generator-side terminal voltage. determining a target value upper limit of the generator-side terminal voltage based on a current voltage value of a direct-current bus of the converter, wherein the generator-side terminal voltage is a terminal voltage of a generator whose output terminal is connected to the converter; determining a target value of the generator-side terminal voltage that is able to minimize a generator-side current at present, and using the determined target value of the generator-side terminal voltage as an optimal target value of the generator-side terminal voltage, wherein the generator-side current is an output current of the generator; setting the target value of the generator-side terminal voltage based on the determined target value upper limit of the generator-side terminal voltage and the optimal target value of the generator-side terminal voltage, wherein the step of setting the target value of the generator-side terminal voltage based on the determined target value upper limit of the generator-side terminal voltage and the optimal target value of the generator-side terminal voltage comprises: setting, under a condition that the determined optimal target value of the generator-side terminal voltage exceeds the determined target value upper limit of the generator-side terminal voltage, the target value of the generator-side terminal voltage as the determined target value upper limit of the generator-side terminal voltage; setting, under a condition that the determined optimal target value of the generator-side terminal voltage does not exceed the determined target value upper limit of the generator-side terminal voltage, the target value of the generator-side terminal voltage as the determined optimal target value of the generator-side terminal voltage. setting, under a condition that the determined optimal target value of the generator-side terminal voltage exceeds the determined target value upper limit of the generator-side terminal voltage, the target value of the generator-side terminal voltage as the determined target value upper limit of the generator-side terminal voltage; setting, under a condition that the determined optimal target value of the generator-side terminal voltage does not exceed the determined target value upper limit of the generator-side terminal voltage, the target value of the generator-side terminal voltage as the determined optimal target value of the generator-side terminal voltage.