Hybrid multilevel current conversion circuit topology structure and control method thereof

Abstract

The invention discloses a hybrid multilevel current conversion circuit topology structure, which comprises a direct current bus shared by three phases, an A-phase bridge circuit, a B-phase bridge circuit, a C-phase bridge circuit, an A-phase LC filtering circuit, a B-phase LC filtering circuit and a C-phase LC filtering circuit, wherein a first leading-out terminal of the A-phase bridge circuit, a first leading-out terminal of the B-phase bridge circuit and a first leading-out terminal of the C-phase bridge circuit are connected with a positive direct current bus; a second leading-out terminal of the A-phase bridge circuit, a second leading-out terminal of the B-phase bridge circuit and a second leading-out terminal of the C-phase bridge circuit are connected with a negative direct current bus; third and fourth leading-out terminals of the A-phase bridge circuit are connected with the A-phase LC filtering circuit; third and fourth leading-out terminals of the B-phase bridge circuit are connected with the B-phase LC filtering circuit; and third and fourth leading-out terminals of the C-phase bridge circuit are connected with the C-phase LC filtering circuit. The hybrid multilevel current conversion circuit topology structure can be applied to back-to-back structures and high voltage direct current transmission (HVDC) and flexible alternating current transmission systems (FACTS).

Description

technical field [0001] The invention relates to an AC-DC conversion circuit topology and a control method thereof, in particular to a hybrid multilevel converter circuit topology and a control method for providing three-phase AC and DC conversion for high-voltage and high-power applications. Background technique [0002] The research on high-voltage and high-power commutation technology began in the 1970s, and serial-parallel technology of power devices, inverter parallel technology, transformer multiplexing technology, and combined inverter phase-shift SPWM technology appeared successively. Although these technologies have improved The voltage and power levels of the commutation technology, but most of them have not reached the level of customer satisfaction in terms of output voltage waveform quality, reliability, and loss. Multi-level converter circuit topology technology is a new type of inverter that achieves high-voltage and high-power output by improving the topology ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of high DC bus voltage level, large number of components, large system loss, complicated control and high system cost required by the existing converter topology. Based on hybrid multi-level technology, a three-phase adjustable Shared DC bus, new high-voltage and high-power converter topology suitable for back-to-back structure and its control method

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