Current limiting type dynamic voltage restorer and uninterrupted power supply method thereof

Abstract

The invention discloses a current limiting type dynamic voltage restorer and an uninterrupted power supply method thereof; the restorer comprises a current transformer, an A-phase cascade transformer, a B-phase cascade transformer, and a C-phase cascade transformer; the primary side input ends of the A,B and C phase transformers are respectively connected with A phase, B phase and C phase of a power supply, and primary side output ends are respectively connected with a load; A phase, B phase and C phase of an output end of the current transformer are respectively connected in series with secondary sides of the A,B and C phase transformers. The current limiting type dynamic voltage restorer is connected between a power grid and the load in a cascade manner, thus realizing dynamic compensation for the power grid voltage, and limiting power grid short circuit fault current. The uninterrupted power supply method comprises an IGBT bypass work mode, a thyristor follow current work mode and a machinery switch bypass work mode, thus enhancing power grid safety and reliability, realizing load power supply continuity, and ensuring normal operation of the power grid and the load.

Description

technical field [0001] The invention relates to the field of power quality management methods, in particular to a current-limiting dynamic voltage restorer and an uninterrupted power supply method thereof. Background technique [0002] With the development of science and technology, the society's demand for electricity is also increasing, and the requirements for power quality are also getting higher and higher. A large number of statistical data show that voltage sag is a type of dynamic power quality problem with the highest frequency, the most serious impact, and the largest economic loss. The most direct impact of voltage drop on equipment is that because the voltage is lower than the rated voltage, when the drop lasts for a long time, the equipment cannot get enough energy and cannot work normally; Exit operation; for most microcomputers and microelectronic control equipment, the recovery process of voltage drop will cause the restart of the microcomputer. On the othe...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: aiming at the technical problems existing in the prior art, the present invention provides a method that can not only perform voltage dynamic compensation when the grid voltage drops, but also realize short-circuit fault current compensation when a short-circuit fault occurs in the grid. Current-Limited Dynamic Voltage Restorer

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