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Harmonic superposition method of three-phase bridge rectification load based on capacitor filter

A three-phase bridge and capacitor filtering technology, which is applied in the AC network to reduce harmonics/ripples, harmonic reduction devices, irreversible AC power input conversion to DC power output, etc., to reduce harmonic pollution and reduce costs Effect

Active Publication Date: 2019-03-29
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, how to combine harmonic sources to effectively reduce the pollution to the power grid, there is no relevant research plan in the prior art

Method used

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  • Harmonic superposition method of three-phase bridge rectification load based on capacitor filter
  • Harmonic superposition method of three-phase bridge rectification load based on capacitor filter
  • Harmonic superposition method of three-phase bridge rectification load based on capacitor filter

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Embodiment Construction

[0025] The following describes the technical solutions in the embodiments of the present invention clearly and completely with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0026] The embodiment of the present invention provides a three-phase bridge rectification type load harmonic superposition method based on capacitor filtering, such as figure 1 As shown, it mainly includes: connecting two identical capacitor filter type three-phase bridge rectifier circuits on the AC side bus; each capacitor filter type three-phase bridge rectifier circuit includes: a three-phase diode rectifier connected to the AC side bus...

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Abstract

The invention discloses a three-phase bridge-type rectifier load harmonic superposition method based on capacitor filtering. The method is characterized in that an alternating current side bus is connected to two same capacitor-filtering-type three-phase bridge rectifier circuits; and each capacitor-filtering-type three-phase bridge rectifier circuit includes a three-phase diode rectifier connected to the alternating current side bus, a filtering capacitor and a load resistor, wherein the filtering capacitor and the load resistor are connected in parallel to a direct current side of the three-phase diode rectifier; and a capacitance difference of the filtering capacitors in the two capacitor-filtering-type three-phase bridge rectifier circuits exceeds a threshold. By using the method, an influence of a three-phase bridge-type rectifier load harmonic of the capacitor filtering on a power grid can be actively reduced, harmonic treatment measures can be well made and cost of electric power system harmonic treatment is reduced.

Description

Technical field [0001] The invention relates to a harmonic superposition method in the field of power system multi-harmonic source superposition, in particular to a three-phase bridge rectification type load harmonic superposition method based on capacitor filtering. Background technique [0002] With the rapid development of science and technology, power electronic technology has penetrated into various fields such as electric power, metallurgy, chemical industry, communications, railway electrical and household appliances. In power electronic devices, the rectifier, as the interface between the device and the power grid, occupies a considerable proportion. Since the current power grid is all alternating current, usually the circuit needs to use a rectifier for AC / DC conversion. At present, the most commonly used is the capacitor filter three-phase bridge rectifier circuit. The widespread use of capacitor-filtered three-phase bridge rectifier loads has aroused great attention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02M7/06
CPCH02J3/01H02M7/06Y02E40/40
Inventor 朱明星夏勇王群京陈兵罗珊珊丁宁雷林绪潘岩赵闪闪余斌李开金
Owner STATE GRID CORP OF CHINA
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