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Power factor correction device

A power factor correction and rectifier technology, applied in output power conversion devices, energy industry, climate sustainability, etc., can solve problems such as inability to compensate for higher harmonics

Inactive Publication Date: 2015-01-14
JIANGSU ELECTRIC POWER CO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual control, active filters cannot effectively compensate high-order harmonics, so it is necessary to provide a method for suppressing high-order harmonics for power factor correction circuits with active filters to further optimize the power factor of the circuit

Method used

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Embodiment Construction

[0023] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] figure 2 It is a structural diagram of the main circuit circuit of the present invention. A power factor corrector is installed at both ends of the single-phase AC power supply Vi, including a rectifier 1, an active filter 2, the output terminal of the power factor corrector is connected to the load, and the output terminal of the rectifier 1 is connected in series with an inductor L1 and connected to the active filter. The output terminal of the source filter 2 is connected, and the output terminal of the active filter 2 is not connected in series with an inductor. The active filter in the corrector should work in at least two quadrants (the output voltage is positive, the output current can be positive or negative), and considering the economy, a two-quadrant active filter is used. 4 is composed of a switch t...

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Abstract

The invention relates to a power factor correction device, in particular to a power factor correction device with an active filter. The power-factor correction device comprises a rectifier, a first inductor, the active filter and a load, wherein the rectifier receives alternating current and provides direct current for a post-stage circuit; the first end of the first inductor is connected with the first output end of the rectifier; the active filter is connected with the second end of the first inductor, and the output end of the active filter is not connected with the inductor in series; the first input end of the load is connected with the second end of the first inductor; the second input end of the load is connected with the second output end of the rectifier. Due to the fact that the first inductor filters out high-order current harmonic waves output by the rectifier, only the high-order current harmonic waves output by the load side needs to be compensated by the active filter, and the control difficulties can be lowered greatly.

Description

technical field [0001] The invention relates to a power factor corrector, in particular to a power factor corrector with an active filter. Background technique [0002] Traditional single-phase rectifiers often have large total harmonic distortion and poor power factor, so active filters are applied to rectifier harmonic elimination and power factor correction. However, both the rectifier and the load will generate a large number of harmonics, such as figure 1 As shown, the current output from the output terminal of the rectifier has a large number of high-order current harmonics I 2_h , at the same time, high-order current harmonics I will be generated from the load side lo_h . According to the working principle of the active filter to compensate the current waveform, at this time the active filter must generate an I 2_h and I lo_h Offset high-order harmonics to achieve the purpose of compensating waveforms. In actual control, active filters cannot effectively compens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42
CPCH02M1/4233Y02B70/10Y02P80/10
Inventor 徐雅梅曼苏乐
Owner JIANGSU ELECTRIC POWER CO