Transformer-free series voltage quality regulator based on parasitic booster circuit and control method of regulator

Abstract

The invention discloses a transformer-free series voltage quality regulator based on parasitic booster circuit and a control method of the regulator. The transformer-free series voltage quality regulator comprises a power supply, an inverter device, a capacitor energy storage device, an output filter inductor, a controllable rectifier device, a rectifying-filtering inductor, a load, an output filter capacitor, a bypass switch, and a control system, wherein the inverter device and the capacitor energy storage device are serially connected between the power supply and the load to only control the deviation causing the voltage quality problem, i.e. partial inversion control, which needs less energy; a boosting charging loop of the capacitor energy storage device is parasitically arranged in the inverter device; the charging condition of the capacitor energy storage device can be controlled by the controllable rectifier device according to the requirement for load compensation to improve the compensation range and efficiency of the device.

Description

【Technical field】 [0001] The invention belongs to the technical field of voltage quality control in electrotechnical technology, in particular to a transformerless series AC voltage quality regulator based on a parasitic step-up circuit and a control method thereof. 【Background technique】 [0002] With the development of modern science and technology, on the one hand, the factors causing power quality problems continue to grow; on the other hand, various complex, sophisticated, and power-quality-sensitive electrical equipment continue to popularize, and people's requirements for power quality and reliability The higher and higher, the contradictions of the above problems are becoming more and more prominent. [0003] Most of the power quality problems can be attributed to the voltage quality problem, especially the voltage quality problem of the common node. Various disturbances in the grid voltage, such as voltage rises, drops, transients, harmonics, etc., will lead to the...

AI Technical Summary

Problems solved by technology

Disadvantages: poor load adaptability, sensitive to frequency changes, large volume

Disadvantages: sensitive to frequency changes, poor load adaptability

[0010] see figure 1 Shown is the topological structure diagram of the existing transformerless series active AC voltage quality regulator. However, the compensation capability of the regulator is limited, and it is greatly affected by the power grid

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