Static network coupling for high power for coupling a three-phase network at a higher frequency and a single-phase network at a lower frequency

摘要

A static network coupling for high power for coupling a three-phase network at a higher frequency and a single-phase network at a lower frequency, having a frequency-reducing direct converter, which is connected to the three-phase network, with a three-phase output in which two phase outputs are connected to the single-phase network and, in each case via an electronic phase-shifter for balancing the load, to the third phase output, and having an electronic phase shifter which is arranged between the phase outputs connected to the single-phase network and has parallel capacitance for the entire single-phase reactive power, the object exists to achieve a supply of energy back from the single-phase network into the three-phase network as well, without any special increased circuitry cost. This is achieved in that the phase reversal required to supply electrical energy back from the single-phase network is always carried out electronically by changing over the delay angle of the direct converter. A particular field of application is railway power supplies.