Dynamic voltage compensation device for AC/DC hybrid power distribution network and control method thereof

Abstract

The invention relates to a dynamic voltage compensation device for an AC / DC hybrid power distribution network and a control method thereof. The device comprises an A-phase rectification transformation module, a B-phase rectification transformation module and a C-phase rectification transformation module which are electrically connected with one another; each of the A-phase rectification transformation module, the B-phase rectification transformation module and the C-phase rectification transformation module comprises: a high-voltage input side electrical wiring terminal, an electric reactor, a plurality of power units of which the input sides are connected in series and a plurality of isolation transformers of which the primary sides are electrically connected with the output sides of the power units respectively; the power units at the tail ends of the A-phase rectification transformation module, the B-phase rectification transformation module and the C-phase rectification transformation module are electrically connected with one another, and the isolation transformers at the tail ends are electrically connected with one another; the input side outgoing line terminals of the power units at the tail ends are short-circuited together to form a high-voltage neutral point N; and the direct current bus leading-out terminal of one power unit at the tail end is used as a low-voltage direct current output side negative wiring terminal and a low-voltage direct current output side positive wiring terminal.

Description

technical field [0001] The invention relates to the technical field of power quality control, in particular to a reconfigurable dynamic voltage compensation device and a control method thereof for an AC / DC hybrid distribution network. Background technique [0002] Natural disasters such as lightning strikes, short circuits, large-capacity load switching, grounding, and grid failures will cause transient power quality problems such as voltage sags and short-term interruptions, which will bring huge economic losses to sensitive load users such as chip processing and scientific research parks. Its harmfulness has surpassed steady-state power quality problems such as harmonics, three-phase unbalance, and voltage deviation. At present, the voltage sag and short-term interruption control devices mainly include low-voltage dynamic voltage restorer (DVR), solid-state transfer switch (SSTS), uninterruptible power supply (UPS), etc., which generally have defects, such as complex DVR e...

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Problems solved by technology

[0002] Natural disasters such as lightning strikes, short circuits, large-capacity load switching, grounding, and grid failures will cause transient power quality problems such as voltage sags and short-term interruptions, which will bring huge economic losses to sensitive load users such as chip processing and scientific research parks. Its harmfulness has surpassed steady-state power quality problems such as harmonics, three-phase unbalance, and voltage deviation.

At present, the voltage sag and short-term interruption control devices mainly include low-voltage dynamic voltage restorer (DVR), solid-state transfer switch (SSTS), uninterruptible power supply (UPS), etc., which generally have defects, such as complex DVR equipment and series safety factor requirements The high compensation range is small, and the dynamic response of the parallel type is relatively poor; SSTS requires dual-circuit, independent power supplies, the switching logic is complex, and there is a long power outage time during the switching process; UPS is usually applied to small-capacity loads, with slow response speed and low efficiency. And accompanied by power quality problems such as harmonic pollution

[0003] On the other hand, more and more sensitive loads on the user side, such as data centers, use DC power distribution, which saves a lot of commutation links and effectively reduces distribution power loss. However, current voltage sag control devices generally do not have DC output ports. , unable to meet the transient voltage problem management requirements of the above occasions

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