Series-parallel isolation passive power filter

A power filter and parallel technology, which is applied to harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., can solve problems such as passive filtering effects affecting power users, achieve significant filtering effects and reduce fundamental waves. The effect of loss

Inactive Publication Date: 2007-12-05
SOUTHEAST UNIV
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Problems solved by technology

In addition, with the increase of harmonic sources in the power system, the high-order harmonics in the power grid seriously affect the passive filtering effect of power users as a single individual

Method used

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  • Series-parallel isolation passive power filter

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Embodiment Construction

[0024] A series-parallel isolation passive power filter of the present invention consists of a first capacitor C 1 , the second capacitor C 2 , the first reactor L 1 , the second reactor L 2 , the third reactor L 3 composition, characterized in that: a first capacitor C 1 with the first reactor L 1 The first resonant branch 1 is formed and connected between the power grid and the user, and the third resonant branch 3 is connected in parallel on the load side. This branch is composed of the second capacitor C 2 with the second reactor L 2 After parallel connection, the second resonant branch 2 is formed and then connected with the third reactor L 3 A series resonant circuit with the lowest harmonic formed in series.

[0025] The third capacitor C is connected in series in the third resonant branch 3 3 , forming a multi-tuning circuit 3 . The third reactor L in the third resonant branch 3 3 A resistor R is connected in parallel to form a high-pass filter circuit 3 . T...

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Abstract

The invention is a series-parallel isolated passive power filter, belonging to the field of electric energy quality controller of power distribution system, comprising first capacitor, second capacitor, first reactor, second reactor, and third reactor, where the first capacitor and the first reactor form first resonant circuit connected between power supply and load, a third resonant branch circuit is connected in parallel on the load side and the second capacitor and second reactor are connected in parallel to compose second resonant branch circuit which is connected in series with the third reactor to compose the third resonant branch circuit. The load-side closed circuit of harmonic waves on power supply side is isolated; the second resonant branch circuit is infinite impedance to base wave, increasing load power factor; the third resonant branch circuit is zero impedance to the lowest-order harmonic wave and extremely low impedance to other harmonic waves.

Description

technical field [0001] The invention provides a reactor capacitor series-parallel resonant power filtering device, which belongs to the field of harmonic wave control equipment in power systems. Background technique [0002] The current harmonics in the power system mainly come from nonlinear loads including rectification links such as frequency converters and intermediate frequency furnaces. With the wide application of these nonlinear loads, there are more and more current harmonics in the power system, and the power quality is deteriorating day by day. Therefore, it is extremely urgent to filter the current harmonics generated by these nonlinear loads. At present, there are two main schemes for filtering current harmonics in power systems, one is traditional passive filtering (such as filtering with single-tuning, double-tuning and other filter circuits), and the other is using active filters. filtering. The passive filter used in the traditional passive filtering solut...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 王宝安
Owner SOUTHEAST UNIV
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