Modular filter

Abstract

The invention discloses a modular filter consisting of a winding iron core and a three-phase winding ABC, wherein the winding iron core is formed by overlapping a plurality of steel discs. The modular filter is characterized in that the winding iron core is provided with three wrapping posts; the first winding of a three-phase line is respectively wound on the three wrapping posts in sequence; the second winding of the three-phase line is wound as follows: phase A is wound below phase B wound below phase C, phase C is wound below phase A; the third winding of the three-phase line is wound as follows: phase A is wound below phase C wound below phase B, phase B is wound below phase A; and in the winding method, current flowing past phase A and opposing windings wound on the iron cores of phase B and phase C are utilized to offset partial current of phase B and phase C, thereby preventing the generation of harmonics.

Description

technical field [0001] The invention relates to a novel modular harmonic filtering device, which mainly utilizes a harmonic current of one phase to react on the harmonic current of another phase to cancel the harmonic, and belongs to the electrical field. Background technique [0002] Ideally, the current and voltage in the grid are pure sine waves. In recent years, with the wide application of power electronic equipment, the harmonic components in the grid operation have increased sharply, which has seriously affected the power quality, endangered the safety of power consumption, and caused energy waste. Harmonic is the Fourier decomposition of periodic non-sinusoidal electricity to obtain a series of components of different frequencies, the part greater than the fundamental frequency is called harmonic, and the ratio of harmonic frequency to fundamental frequency is called harmonic order. When the sinusoidal fundamental wave voltage is applied to nonlinear equipment, the ...

AI Technical Summary

Problems solved by technology

For example, the high-order harmonic current generated by semiconductor material production equipment can reach 60~90% of the 50Hz fundamental current, which greatly increases energy consumption and pollution to the power grid

In large enterprises, due to the extensive use of energy-saving spotlights and frequency converters, the high-order harmonic current reaches 40% of the fundamental current, resulting in a large loss of compensation capacitors in power factor compensation cabinets

Currently there is no effective management device

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