| CPC H02M 1/10 (2013.01) [H02M 7/2173 (2013.01); H02J 7/02 (2013.01); H02J 2207/20 (2020.01); H02M 1/15 (2013.01); H02M 7/797 (2013.01)] | 3 Claims |
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1. A method for rectifying two-phase current from a two-phase alternating current source with the aid of a bidirectional power converter:
wherein the bidirectional power converter comprises:
a first power converter valve half-bridge comprising two controlled power converter valves;
an intermediate circuit;
a three-phase alternating current input and output;
a first power converter stage having a first input/output and a second input/output; and
a second power converter stage having a first input/output and a second input/output and a direct current input/output,
wherein the first input/output of the first power converter stage is electrically connected to the three-phase alternating current input/output,
wherein the second input/output of the first power converter stage is electrically connected to the intermediate circuit,
wherein the first input/output of the second power converter stage is electrically connected to the intermediate circuit,
wherein the second input/output of the second power converter stage is electrically connected to the direct current output,
wherein the first power converter stage comprises a controlled six-pulse bridge circuit comprising six controllable power converter valves arranged in three half-bridges, including inductors between the three-phase alternating current inputs and the bridge center points of the half-bridges,
wherein the intermediate circuit includes a capacitor half-bridge comprising a first capacitor and a second capacitor,
wherein the first capacitor is connected to a first connection of the second input/output of the first power converter stage and a first connection of the first input/output of the second power converter stage and to the second capacitor,
wherein the second capacitor is connected to a second connection of the second input/output of the first power converter stage and a second connection of the first input/output of the second power converter stage and to the first capacitor,
wherein a connecting point between the first capacitor and the second capacitor is connected to a neutral conductor connection of the three-phase alternating current input/output,
wherein the first power converter valve half-bridge comprising the two controlled power converter valves is connected to the first connection and the second connection of the second input/output of the first power converter stage, and whose connecting point between the power converter valves of the first power converter valve half-bridge is connected to the connecting point of the capacitor half-bridge via a first inductor,
wherein the bidirectional power converter does not include a transformer,
wherein the first power converter valve half-bridge is formed by a first of the half-bridges of the controlled six-pulse bridge circuit,
wherein the first power converter stage includes a first switch, and
wherein the method comprises:
connecting the power converter to the two-phase alternating current source via a second outer conductor and a third outer conductor connection of the three-phase alternating current input/output, the first switch being in the switch position, in which a conductive connection exists from the connecting point of the first power converter valve half-bridge to the connecting point of the capacitor half-bridge via the first inductor; and
controlling the first power converter stage so that the power converter valves of the first power converter valve half-bridge regulate a voltage over the first and/or second capacitor of the capacitor half-bridge.
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