Dynamic voltage restorer and intelligent control method thereof

Abstract

The invention discloses a dynamic voltage restorer and an intelligent control method thereof and relates to an electric power system and power electronics. During single-phase compensation, each of an a phase compensator, a b phase compensator and a c phase compensator is formed by a Quasi-Z-Source AC-AC converter and an isolation transformer; during two-phase compensation, each of the a phase compensator, the b phase compensator and the c phase compensator is formed by a Quasi-Z-Source AC-AC converter 1, a Quasi-Z-Source AC-AC converter 2, an isolation transformer 1 and an isolation transformer 2; and during three-phase compensation, each of the a phase compensator, the b phase compensator and the c phase compensator is formed by a Quasi-Z-Source AC-AC converter 1, a Quasi-Z-Source AC-AC converter 2, a Quasi-Z-Source AC-AC converter 3, an isolation transformer 1, an isolation transformer 2 and an isolation transformer 3.

Description

technical field [0001] The invention relates to power systems and power electronics, in particular to a dynamic voltage restorer (DVR) based on a novel voltage-type Quasi-Z-Source AC-AC converter and an intelligent control method thereof. Background technique [0002] With the development of modern science and technology, the degree of production automation has been continuously improved, and various complex and sophisticated electrical equipment has been widely used. These sensitive loads have high requirements for power quality. Among many power quality problems, voltage sags and voltage swells are the most common hazards, which will have a significant impact on industrial production. Studies have shown that even a short-term voltage sag / swell may cause equipment failure and operation interruption, which will cause huge economic losses and waste of resources. [0003] In order to solve the problem of voltage sag / swell, a series compensation device called Dynamic Voltage R...

AI Technical Summary

Problems solved by technology

[0005] (1) The DC energy storage unit has large volume and weight, high cost and limited life;

[0006] (2) Energy can only flow in one direction;

[0007] (3) The average value of the output DC voltage cannot be adjusted, the power factor is low, and the harmonic content is high;

[0008] (4) Difficult to integrate

However, the traditional AC-AC converter DVR also has obvious shortcomings, and the phase angle between the injected compensation voltage and the compensated phase voltage cannot exceed

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