Plug-and-play integrated modular series type dynamic voltage compensator

Abstract

The invention, which belongs to the field of power compensators, discloses a plug-and-play integrated modular series type dynamic voltage compensator. A compensation voltage calculation module calculates a needed dynamic voltage compensation amount according to the drop of a load voltage. A voltage detection module includes a voltage transformer and an adder; the voltage transformer detects the voltage at the secondary side of a special transformer; and the adder adds the dynamic voltage compensation amount to the voltage at the secondary side of the special transformer and then outputs a reference voltage signal. The primary side winding of the special transformer serves as a bus bar and is connected to a grid; the secondary side winding winds along the axial direction of the iron core and is connected with the output end of an inversion control module; the inversion control module outputs a control voltage based on the reference voltage signal; and thus the secondary side of the special transformer generates a compensation voltage applied to the secondary side of the special transformer in a counteractive manner, thereby realizing voltage compensation. The access to the grid is realized by the hollow cylindrical iron core of the special transformer; the access becomes convenient; the inverter quantity is small; the structure and control become simple; and the compensation effect is good.

Description

technical field [0001] The invention belongs to the field of power compensators, and more specifically relates to a plug-and-play integrated modular series dynamic voltage compensator. Background technique [0002] With the development of science and technology and the improvement of people's living standards, sensitive electrical equipment based on computers and microprocessors is widely used, and they have high requirements for power quality. A large number of statistical data at home and abroad show that among all power quality problems, voltage transients occur frequently and are the most harmful, and in voltage transient problems, grid voltage drops will cause considerable economic losses. Therefore, the problem of voltage transient compensation has huge economic and social benefits, and is a hot spot in the field of electric power research. [0003] DVR (dynamic voltage restorer) is a power quality compensation device connected in series between the power supply and t...

AI Technical Summary

Problems solved by technology

However, the direct series connection of multiple power devices requires complex buffer circuits and drive circuits, which will reduce the response speed of the DVR

[0012] In view of the complex structure of the existing single-phase or three-phase voltage compensators, and the problems that they are likely to have adverse effects on the power grid during installation or work, there is an urgent need for a voltage compensator with a simple structure and little negative impact

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