The invention relates to a method for controlling a variable speed drive comprising Ni low voltage power cells connected in series for each phase among several phases, i being a phase index. The method comprises the repetition of P iterations comprising: - activation (201) of at least one cell of one or more phases and deactivation of the other power cells of the variable speed drive, in which the at least one activated cell is selected according to predefined activation commands dependent on a iteration index; - reception (205) of at least one output voltage of the variable speed drive across the electrical device for at least one phase; The method further comprises, at the end of the P iterations, the determination (206 ), from the measured variable speed drive output voltages, rectified voltage values at the output of the respective rectification stages of the variable speed power cells, and the storage of the rectified voltages ssées obtained, respectively associated with the power cells of the frequency converter.
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