Three-level pseudo totem pole type converter suitable for single-phase AC/DC hybrid microgrid

Abstract

The invention relates to a three-level pseudo totem pole type converter suitable for a single-phase AC / DC hybrid micro-grid. The three-level pseudo totem pole type converter comprises a pseudo totem pole structure consisting of a diode, switching tubes S1 and S2 and inductors L1 and L2, the diode clamping type three-level structure is composed of switching tubes S3-S6 and diodes D3 and D4, and the direct-current bus structure is composed of capacitors C1 and C2 which are connected in series. One side of the alternating current power supply ug is connected with the inductors L1 and L2, and the inductor L1, the drain electrode of the switching tube S1 and the anode of the D1 are connected; the inductor L2 is connected with the cathode of the diode D2 and the source electrode of S2; the other side of the alternating current power supply ug is connected with a source electrode of a switch tube S4 and a drain electrode of a switch tube S5; the cathode of the diode D1, the drain electrodes of the switching tubes S2 and S3, the anode of the capacitor C1 and the anode of the direct-current power supply Udc are connected; the anode of the diode D2, the source electrodes of the switching tubes S1 and S6, the cathode of the capacitor C2 and the cathode of the direct-current power supply Udc are connected; and the anode of the diode D3 and the cathode of the diode D4 are connected with the split capacitors C1 and C2. The invention can realize the advantages of bidirectional energy flow, small alternating current harmonic wave, low voltage and current stress of the switch tube and the like.

Description

technical field [0001] The invention relates to the field of multi-level converters, in particular to a three-level pseudo-totem-pole converter suitable for a single-phase AC-DC hybrid microgrid. Background technique [0002] With the increasing maturity of single-phase AC-DC hybrid micro-AC, it gradually provides power support for users together with public AC. Under single-phase grid-connected operation, the single-phase micro-AC system is strongly supported by public communication, which has the effect of shaving peaks and filling valleys. When the public communication fails, it can be quickly disconnected from the public communication to ensure that important loads such as hospitals and transportation hubs can continue to supply power for a short time, and improve the reliability of power supply. Single-phase AC-DC hybrid micro-AC is composed of single-phase AC sub-microgrid, DC sub-microgrid and dual AC-DC converters, which can directly supply power to single-phase AC ...

AI Technical Summary

Problems solved by technology

In the research of single-phase AC-DC hybrid micro-AC, the existing technology mainly focuses on the research on the control method of the bidirectional AC-DC converter, and there is relatively little research on the topology of the single-phase converter.

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