AC/DC electrical conversion device permitting energy recovery and management of DC-side short-circuits

摘要

An AC/DC electrical converter device having a source mode and a recovery mode, and for connection, on the AC side, to an AC voltage source and, on the DC side, to a DC power distribution network. It includes an AC/DC converter, a switching cell with two switches (K1, K2) that are bidirectional for current, the switches sharing a common point (A) and each having a respective end terminal (B1, B2), a filter stage, and a control unit for the cell; the converter is for connection on the AC side to the voltage source and is connected on the DC side to the cell; in use, the first switch (K1) is connected between the converter and the DC power distribution network via the filter stage, the second switch (K2) forming a combination in parallel with the filter stage and the DC power distribution network. The control means are able to manage a short-circuit current in source mode by operating on the first and second switches.

主权项

1. An AC/DC electrical converter device intended to be connected on the AC side to an AC voltage source and on the DC side to a DC power distribution network, comprising an AC/DC converter, a switching cell with two switches (K1, K2) that are bidirectional for current, sharing a common point (A) and each having a respective end terminal (B1, B2), an inductive filter stage, a control unit for the switching cell; characterized in that it further comprises a current sensor placed between the common point (A) and the filter stage, and connected to the control unit, intended to detect an increase above a threshold of a current flowing from the first switch (K1) towards the filter stage, this increase in the current reflecting the appearance of the short circuit, the converter being intended to be connected on the AC side to the AC voltage source and being connected on the DC side to the switching cell; in use, the first switch (K1) is connected between the converter and the DC power distribution network (24) via the filter stage, the second switch (K2) forming a combination in parallel with the filter stage and the DC power distribution network; in energy source mode, in the absence of a short circuit on the DC power distribution network side, the control unit holds the second switch (K2) off and controls the first switch (K1) to turn it alternately on and off, in order to authorize flow of current from the converter towards the DC power distribution network via the first switch (K1) and the filter stage, and, in the presence of a short circuit, turns off the first switch (K1) and allows a short circuit current to flow from the DC power distribution network towards the filter stage via the second switch (K2) and adjusts the amplitude and the duration of the short-circuit current by controlling conduction of the first switch (K1) by pulse width modulation.