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Low-resistance and high-pass filter

A high-pass filter and resistor technology, used in impedance networks, harmonic reduction devices, and AC networks to reduce harmonics/ripples, etc., can solve problems such as affecting filtering and suppressing resonance effects, and achieve easy implementation, good high-pass Effects of Features

Active Publication Date: 2014-11-05
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned high-pass filter can be equivalent to a resistor under high-order harmonics (higher frequency), and its resistance value does not change with frequency and is a constant value, and since the resistor is also used to limit the closing current, its resistance The value cannot be selected too small, otherwise it will affect the improvement of its filtering and resonance suppression effect

Method used

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Examples

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Embodiment 1

[0022] figure 1 Shown, the specific embodiment of a kind of low-resistance high-pass filter of the present invention is: a kind of low-resistance high-pass filter, by capacitor-(C 1 ), reactor (L), capacitor two (C 2 ), resistor (R) and switch one (K 1 ), switch two (K 2 ) composition; capacitor one (C 1 ) and reactor (L) form a parallel body (P 1 ), capacitor two (C 2 ) and switch two (K 2 ) is connected in series with the resistor (R) to form a parallel body 2 (P 2 ), a parallel body (P 1 ) and parallel body II (P 2 ) in series; when put into operation, close switch one (K 1 ), after the low-resistance high-pass filter enters a steady state, close switch 2 (K 2 ); when exiting operation, first cut switch one (K 1 ), to be capacitor one (C 1 ) and capacitor two (C 2 ) and then switch off switch 2 (K 2 ).

Embodiment 2

[0024] figure 2 It shows that a specific embodiment of the second-order wave-stopping high-pass filter for a three-phase electric power supply system of the present invention is: a parallel connection (P 1 ) and parallel conjoined two (P 2 ) in series to form a single-phase low-resistance high-pass filter, and the three single-phase low-resistance high-pass filters are connected to the three-phase power supply system according to the Y-type connection, that is, the parallel body of the three single-phase filters (P 2 ) are connected together, and the other ends of the three single-phase filters are respectively connected to the A, B, and C phases of the three-phase power supply system.

[0025] image 3 Shown, another specific embodiment of the second-order wave-stopping high-pass filter used in a kind of three-phase power supply system of the present invention is: parallel body one (P 1 ) and parallel body II (P 2 ) in series to form a single-phase low-resistance high-pa...

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Abstract

The invention discloses a low-resistance and high-pass filter. The low-resistance and high-pass filter is composed of a first capacitor (C1), an electric reactor (L), a second capacitor (C2), a resistor (R), a first switch (K1) and a second switch (K2); the first capacitor (C1) and the electric reactor (L) form a first parallel connection body (P1), the second capacitor (C2) and the second switch (K2) are connected in series and then are connected with the resistor (R) to form a second parallel connection body (P2), and the first parallel connection body (P1) and the second parallel connection body (P2) are connected in series. The filter can generate impedance lower than a resistance value of an existing high-pass filter along with increasing of harmonic orders (frequency), the filtering effect is better, and the capacity for restraining high-frequency resonance is higher.

Description

technical field [0001] The invention relates to the technical field of electrified railway power supply and power system power supply and transformation, in particular to a high-pass power filter. Background technique [0002] The rapid development of power electronic technology has improved the power supply performance of the power grid and has been more and more widely used in various fields of the national economy. However, at the same time, the use of these power electronic (non-linear) devices in the power grid has also caused Harmonic problems are becoming more and more serious. [0003] With the development of diode uncontrolled rectifiers and thyristor semi-controlled rectifiers to AC-DC-AC converters based on fully controlled devices such as IGBTs and IGCTs, the power factor is greatly improved (close to 1), and the lower subharmonic The wave current is significantly improved, and the higher harmonics are increased, which is more likely to stimulate the power grid ...

Claims

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Application Information

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IPC IPC(8): H02J3/01H03H5/00
CPCY02E40/40
Inventor 李群湛李子晗赵元哲王保国李亚楠范红静
Owner SOUTHWEST JIAOTONG UNIV
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