Control method for converting power in which a DC voltage is converted into alternating voltage, a first alternating voltage (AC1) and a second alternating voltage (AC2) being obtained by means of a first inverter (1) and a second inverter (2) respectively. Said alternating voltages (AC1, AC2) are combined in parallel, a resulting alternating voltage (AC12) being obtained. An additional resulting alternating voltage (AC34) is also generated, converting the DC voltage into alternating voltage, an additional alternating voltage (AC3) and another additional alternating voltage (AC4) being obtained by means of a first additional inverter (3) and a second additional inverter (4) respectively, and combining in parallel said additional alternating voltages (AC3, AC4). The additional resulting alternating voltage (AC34) is displaced in phase approximately 180° in relation to the resulting alternating voltage (AC12). Thanks to said method the common-mode voltages are also eliminated from at least one of the alternating voltages.