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Real-time tracking harmonic compensation circuit based on waveform sampling

A technology of waveform sampling and harmonic compensation, applied in harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., to achieve the effect of improving power factor, fast response, and small actual space occupied by the circuit

Active Publication Date: 2016-04-20
SHANGHAI WTL WELDING EQUIP MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional filtering method is to use a passive filter based on the resonance principle, but this can only filter out the harmonics of the set order, and it is easy to generate series and parallel resonance with the power grid

Method used

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  • Real-time tracking harmonic compensation circuit based on waveform sampling
  • Real-time tracking harmonic compensation circuit based on waveform sampling
  • Real-time tracking harmonic compensation circuit based on waveform sampling

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Embodiment Construction

[0017] The waveform sampling-based real-time tracking harmonic compensation circuit of a specific embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, it should be understood that the present invention is not limited to such embodiments described below, and the technical idea of ​​the present invention can be implemented in combination with other known technologies or other technologies having the same functions as those known technologies

[0018] The object of the present invention is to provide a real-time tracking harmonic compensation circuit based on waveform sampling. The principle is that by following the real-time waveform of the sampled power frequency input power and superimposing the given waveform, the output current adaptively follows the input voltage waveform, so that the output power is adaptively adjusted according to the input power, thereby improving the power factor of the welding equipm...

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Abstract

The invention discloses a wave-shape sampling based real-time follow-up harmonic wave compensation circuit. The compensation circuit is used for reducing harmonic waves of a power network current, and comprises a rectifier bridge and a voltage wave-shape sampling isolating circuit, wherein the rectifier bridge is used for rectifying an alternate current into a direct current V1; the voltage wave-shape sampling isolating circuit is used for generating a wave-shape sampling voltage V4 with a zero-volt average voltage on the basis of the wave shape and amplitude value of the direct current V1; the wave-shape sampling voltage V4 is added to an output current in order to improve the power factor of a welding device and lower the reactive power of the welding device.

Description

technical field [0001] The invention relates to a harmonic compensation circuit for reducing electric welding equipment, in particular to a real-time tracking harmonic compensation circuit based on waveform sampling. Background technique [0002] With the wide application of power electronic devices, the harmonic pollution of power system is becoming more and more serious. The main harms caused by harmonics are: increased loss and overload of electrical equipment, reduced power factor, overloaded capacitors, expansion and damage, increased interference, additional harmonic errors in instrument measurement, etc. [0003] The traditional filtering method is to use a passive filter based on the resonance principle, but this can only filter out the harmonics of the set order, and it is easy to generate series and parallel resonance with the power grid. The real-time tracking harmonic compensation circuit based on waveform sampling can dynamically control each harmonic, so it ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 王成田冰张辉吴昊尤志春王品
Owner SHANGHAI WTL WELDING EQUIP MFG CO LTD