A matrix converter (4) comprising: three lines (CA1, CA2, CA3) with AC voltage; two lines (DC1, DC2) with DC voltage; a first switch (10a) connected between a first (CA1) of the three lines of AC voltage and a first (CC1) of the two lines of DC voltage, a second switch (10c) connected between a second (CA2) of the three lines AC voltage and the first (CC1) of the two lines of DC voltage, a third switch (10e) connected between a third (CA3) of the three lines AC voltage and the first (CC1) of the two lines of DC voltage, a fourth switch (10b) connected between the first (CA1) of the three lines ac voltage and a second (CC2) of the two lines of DC voltage, a fifth switch (10d) connected between the second (CA2) of the three lines ac voltage and the second (CC2) of the two lines of DC voltage, and a sixth switch (10f) connected between the third (CA3) of the three power lines AC and second (CC2) of the two dc voltage lines, which switches the first, second, third, cu Arto, fifth and sixth (10a to 10f) are controlled to open and close in sequence using modulation pulse width, such that each of the three lines (CA1, CA2, CA3) with AC voltage can connected to one of the two lines (DC1, DC2) with DC voltage when the associated switch is closed; and a path (22) free movement between the two dc voltage lines that includes a device (24) reverse blocking; in which switches the first, second, third, fourth, fifth and sixth (10a-10f) are bi-directional, so that the matrix converter (4) can be used for applications engine in which a three-phase input voltage is supplied AC to the three lines (CA1-CA3) with AC voltage from a supply network and rectified by the matrix converter (4) to provide a voltage DC output on both lines (DC1, DC2) with voltage cc and for generating applications, in which an input voltage DC is supplied to the two lines (DC1, DC2) with DC voltage and invert the matrix converter (4) to provide an output voltage ca the three lines (CA1, CA2, CA3) with AC voltage; and wherein the switches first, second, third, fourth, fifth and sixth (10a-10f) are controlled using pulse width modulation to connect the lines (DC1, DC2) with DC voltage to the appropriate lines (CA1- CA3) with AC voltage or none of the lines (CA1-CA3) with AC voltage for application engine, having lines (DC1, DC2) with DC voltage a respective polarity of DC voltage, and to connect the three lines (CA1-CA3) with AC voltage to the appropriate line (CC1, CC2) with DC voltage or none of the lines (DC1, DC2) with DC voltage during a generating application with lines (DC1, DC2 ) with DC voltage, having lines (DC1, DC2) with DC voltage the same respective polarity of DC voltage, such that the matrix converter (4) is able to regulate bi-directional power flow whilst retaining a voltage unidirectional DC.
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