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Mixed active electric power filter and direct current side voltage control method thereof

A technology of power filter and DC side voltage, applied in active power filter, harmonic reduction device, AC network to reduce harmonic/ripple, etc., to achieve the effect of reducing capacity and cost

Inactive Publication Date: 2008-04-09
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned technical problems of the existing active power filter, the present invention provides a hybrid active power filter and its DC side voltage control method

Method used

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  • Mixed active electric power filter and direct current side voltage control method thereof
  • Mixed active electric power filter and direct current side voltage control method thereof
  • Mixed active electric power filter and direct current side voltage control method thereof

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Embodiment Construction

[0027] see figure 1 , the hybrid active power filter of the present invention includes an active power filter, a passive power filter, a harmonic current injection branch and a PWM rectifier, and the output of the active power filter is filtered by an output filter and then connected to an isolation The primary side of the transformer and the secondary side of the isolation transformer are connected in parallel with the fundamental wave series resonant circuit of the harmonic current injection branch, and then connected in series with the injection capacitor of the harmonic current injection branch, and then connected to the power grid with the passive filter. The DC side of the source power filter is powered by a PWM rectifier.

[0028] When the passive filter part of the hybrid active power filter compensates the reactive power with a large capacity, the fundamental wave impedance of the PF is small, and a large fundamental wave reactive current flows into the PF. At this t...

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Abstract

The invention discloses a hybrid active power filter and a DC side voltage control method thereof. The hybrid active power filter comprises an active power filter, a passive power filter, a harmonic wave current injection branch and a PWM rectifier. The output of the active power filter is filtered by an output filter and then is connected with a primary side of an isolation transformer; the secondary side of the isolation transformer is partially connected with the fundamental wave series resonant circuit of the resonant wave current injection branch in parallel, then is connected with the injection capacitor of the resonant wave current injection branch in series and then combined in the grid with the passive power filter; the PWM rectifier supplies power for the DC side of the active power filter. The hybrid active power filter of the invention not only effectively controls harmonic wave, but also carries out partial reactive power static compensation with certain capacity by the passive power filter. The three-phase voltage type PWM rectifier is applied to control the DC side voltage, thus preferably maintaining the constant of the DC side voltage.

Description

technical field [0001] The invention relates to a hybrid active power filter, in particular to a hybrid active power filter and a DC side voltage control method thereof. Background technique [0002] Electric energy is the main and essential energy in the production of modern society and people's life. With the development of power electronics technology, a large number of nonlinear loads have been added to the power supply system. It is a nonlinear time-varying topological load, which cannot Avoidance will generate non-sinusoidal waveforms and inject harmonics into the grid, which has become a "public nuisance" in the grid. Harmonic suppression devices mainly include passive power filters or active power filters. [0003] Although the passive filter used alone is low in cost and simple in structure, the filtering effect is greatly affected by the grid impedance and its own parameter changes, and it is easy to resonate with the grid impedance. Although the active power fil...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40Y02E40/22Y02E40/20
Inventor 罗安帅智康刘定国赵伟涂春鸣孙贤大舒适
Owner HUNAN UNIV
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