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Double-tunnel filter based on controllable reactor

A technology for tuning filters and reactors, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, reactive power adjustment/elimination/compensation, etc., can solve manufacturing difficulties, large filters, losses, etc. problem, to achieve the effect of ensuring real-time performance

Inactive Publication Date: 2005-11-09
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large capacity of the filter in the power system, the investment of using a fully adjustable reactor is too large; at the same time, there are also difficulties in manufacturing; especially considering that the filter composed of a fixed reactor widely used at present is completely replaced would cause a lot of damage

Method used

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  • Double-tunnel filter based on controllable reactor
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  • Double-tunnel filter based on controllable reactor

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Embodiment Construction

[0025] The structure of the double tuned filter circuit is as follows figure 1 shown, it consists of capacitor C 1 , Controllable reactor L 1 , resistance R 1 in series, and then in series with the reactor L 2 and resistor R 2 Connected in series with the resistor and capacitor C 2 Parallel branch of parallel connection - four parts are formed in series in sequence.

[0026] The resistance R in the inductor when calculating the analysis 1 , R 2 can be omitted. It has two resonant frequencies and can absorb harmonics of two adjacent frequencies at the same time. Its impedance frequency characteristics are as follows: figure 2 As shown, the horizontal axis is the frequency, and the vertical axis is the impedance of the double-tuned filter. Its characteristic is that the impedance has a minimum value at two specific frequencies, which can make the harmonics of this frequency mainly flow through the filter, thereby reducing such as Harmonics of this frequency of the syst...

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Abstract

A double tuned filter based on a controlled reactor is composed of capacitor C1, controlled reactor L1, capacitor C2, reactor L2, a double tuned filter and a controlled reactor control circuit, among which, the parallel branches of capacitor C1, controlled reactor L1, reactor Lo, capacitor C2 and rector L2 are orderly serial, the double tuned filter is parallel to the system side. This invention alters the output reacting value of the reactor by altering the DC control voltage of the controlled reactor, therefore, the filter parameter can be changed according to the variance of the system parameter to enable the filter to resonate continuously and keep a good filter result.

Description

technical field [0001] The invention relates to a double-tuned filter based on a controllable reactor, which belongs to the field of reactive power compensation and harmonic suppression devices in power systems. Background technique [0002] Power electronic devices are the most important source of harmonics in public power grids. With the increasing application of power electronic devices, the harmonic pollution in power grids is also becoming more and more serious. The existence of the above-mentioned harmonics in the power system increases the transmission loss, reduces the efficiency of the power grid, produces flicker and audio noise, shortens the insulation life, interferes with electronic circuits and communication systems, and causes relay malfunctions. Therefore, suppressing harmonics has become a major issue in the fields of power electronics technology, electrical automation technology and power system research, and is receiving more and more attention. In order ...

Claims

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Application Information

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IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 于明涛陈建业王赞基
Owner TSINGHUA UNIV
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